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List of Changes for MG 1-2003, Revision 1-2004 The following have been revised: Contents, pages vii, viii, xii, xv, xxvii Section I, Part 5, pages 1, 3, 4, 5, 6, 7, 10, 11, 12, 13, 14, 15, 16 Section II, Part 12, pages 18, 26, 35, 37, 39, 41, 43 Section II, Part 14, pages 2, 15, 16, 17 Section III, Part 20, page 10 Section III, Part 21, page 27 Section IV, Part 30, pages 1, 5, 7, 8, 9 Index, pages 3, 4, 5 The revisions are indicated with .

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List of Changes for MG 1-2003, Revision 1-2004The following have been revised:Contents, pages vii, viii, xii, xv, xxviiSection I, Part 5, pages 1, 3, 4, 5, 6, 7, 10, 11, 12, 13, 14, 15, 16Section II, Part 12, pages 18, 26, 35, 37, 39, 41, 43Section II, Part 14, pages 2, 15, 16, 17Section III, Part 20, page 10Section III, Part 21, page 27Section IV, Part 30, pages 1, 5, 7, 8, 9Index, pages 3, 4, 5The revisions are indicated with .ANSI Approval Date September 3, 2004NEMA Standards Publication ANSI/NEMA MG 1-2003, Revision 1-2004Motors and GeneratorsRevisions are indicated with .Published by:National Electrical Manufacturers Association1300 North 17th Street, Suite 1847Rosslyn, VA 22209www.nema.org Copyright by the National Electrical Manufacturers Association. All rights including translationinto other languages, reserved under the Universal Copyright Convention, the Berne Conventionfor the Protection of Literary and Artistic Works, and the International and Pan AmericanCopyright Conventions.NOTICE AND DISCLAIMERThe information in this publication was considered technically sound by the consensus of personsengaged in the development and approval of the document at the time it was developed.Consensus does not necessarily mean that there is unanimous agreement among every personparticipating in the development of this document.The National Electrical Manufacturers Association (NEMA) standards and guideline publications,of which the document contained herein is one, are developed through a voluntary consensusstandards development process. This process brings together volunteers and/or seeks out theviews of persons who have an interest in the topic covered by this publication. While NEMAadministers the process and establishes rules to promote fairness in the development ofconsensus, it does not write the document and it does not independently test, evaluate, or verifythe accuracy or completeness of any information or the soundness of any judgments contained inits standards and guideline publications.NEMA disclaims liability for any personal injury, property, or other damages of any naturewhatsoever, whether special, indirect, consequential, or compensatory, directly or indirectlyresulting from the publication, use of, application, or reliance on this document. NEMA disclaimsand makes no guaranty or warranty, expressed or implied, as to the accuracy or completeness ofany information published herein, and disclaims and makes no warranty that the information inthis document will fulfill any of your particular purposes or needs. NEMA does not undertake toguarantee the performance of any individual manufacturer or sellers products or services byvirtue of this standard or guide.In publishing and making this document available, NEMA is not undertaking to renderprofessional or other services for or on behalf of any person or entity, nor is NEMA undertaking toperform any duty owed by any person or entity to someone else. Anyone using this documentshould rely on his or her own independent judgment or, as appropriate, seek the advice of acompetent professional in determining the exercise of reasonable care in any givencircumstances. Information and other standards on the topic covered by this publication may beavailable from other sources, which the user may wish to consult for additional views orinformation not covered by this publication.NEMA has no power, nor does it undertake to police or enforce compliance with the contents ofthis document. NEMA does not certify, test, or inspect products, designs, or installations forsafety or health purposes. Any certification or other statement of compliance with any health orsafetyrelated information in this document shall not be attributable to NEMA and is solely theresponsibility of the certifier or maker of the statement.MG 1-2003Page iCONTENTSPage No.Foreword..........................................................................................................................................xxxvSection I GENERAL STANDARDS APPLYING TO ALL MACHINESPart 1REFERENCED STANDARDS AND DEFINITIONS............................................................1-1REFERENCED STANDARDS ..........................................................................................................1-1DEFINITIONS ....................................................................................................................................1-4CLASSIFICATION ACCORDING TO SIZE ......................................................................................1-41.2 MACHINE .............................................................................................................................1-41.3 SMALL (FRACTIONAL) MACHINE......................................................................................1-41.4 MEDIUM (INTEGRAL) MACHINE........................................................................................1-41.4.1 Alternating-Current Medium Machine.........................................................................1-41.4.2 Direct-Current Medium Machine.................................................................................1-41.5 LARGE MACHINE................................................................................................................1-41.5.1 Alternating-Current Large Machine.............................................................................1-41.5.2 Direct-Current Large Machine ....................................................................................1-5CLASSIFICATION ACCORDING TO APPLICATION......................................................................1-51.6 GENERAL PURPOSE MOTOR............................................................................................1-51.6.1 General-Purpose Alternating-Current Motor...............................................................1-51.6.2 General-Purpose Direct-Current Small Motor ............................................................1-51.7 GENERAL-PURPOSE GENERATOR..................................................................................1-51.8 INDUSTRIAL SMALL MOTOR.............................................................................................1-51.9 INDUSTRIAL DIRECT-CURRENT MEDIUM MOTOR.........................................................1-51.10 INDUSTRIAL DIRECT-CURRENT GENERATOR...............................................................1-51.11 DEFINITE-PURPOSE MOTOR............................................................................................1-61.12 GENERAL INDUSTRIAL MOTOR........................................................................................1-61.13 METAL ROLLING MILL MOTORS.......................................................................................1-61.14 REVERSING HOT MILL MOTORS......................................................................................1-61.15 SPECIAL-PURPOSE MOTOR .............................................................................................1-61.16 NEMA PREMIUM EFFICIENCY MOTOR.........................................................................1-6CLASSIFICATION ACCORDING TO ELECTRICAL TYPE.............................................................1-61.17 GENERAL.............................................................................................................................1-61.17.1 Electric Motor .............................................................................................................1-61.17.2 Electric Generator......................................................................................................1-61.17.3 Electric Machines.......................................................................................................1-61.18 ALTERNATING-CURRENT MOTORS.................................................................................1-71.18.1 Induction Motor ..........................................................................................................1-71.18.2 Synchronous Motor....................................................................................................1-71.18.3 Series-Wound Motor.................................................................................................1-71.19 POLYPHASE MOTORS .......................................................................................................1-81.19.1 Design Letters of Polyphase Squirrel-Cage Medium Motors ....................................1-81.20 SINGLE-PHASE MOTORS ..................................................................................................1-81.20.1 Design Letters of Single-Phase Small Motors...........................................................1-81.20.2 Design Letters of Single-Phase Medium Motors .......................................................1-91.20.3 Single-Phase Squirrel-cage Motors...........................................................................1-91.20.4 Single-Phase Wound-Rotor Motors.........................................................................1-101.21 UNIVERSAL MOTORS.......................................................................................................1-101.21.1 Series-Wound Motor................................................................................................1-101.21.2 Compensated Series-Wound Motor ........................................................................1-101.22 ALTERNATING-CURRENT GENERATORS......................................................................1-101.22.1 Induction Generator .................................................................................................1-101.22.2 Synchronous Generator...........................................................................................1-10MG 1-2003Page ii1.23 DIRECT-CURRENT MOTORS...........................................................................................1-101.23.1 Shunt-Wound Motor.................................................................................................1-111.23.2 Series-Wound Motor................................................................................................1-111.23.3 Compound-Wound Motor ........................................................................................1-111.23.4 Permanent Magnet Motor ........................................................................................1-111.24 DIRECT-CURRENT GENERATORS .................................................................................1-111.24.1 Shunt-Wound Generator..........................................................................................1-111.24.2 Compound-Wound Generator .................................................................................1-11CLASSIFICATION ACCORDING TO ENVIRONMENTAL PROTECTION AND METHODSOF COOLING..................................................................................................................................1-111.25 OPEN MACHINE (IP00, IP01)............................................................................................1-111.25.1 Dripproof Machine (IP12, IP01) ...............................................................................1-121.25.2 Splash-Proof Machine (IP13, IP01) .........................................................................1-121.25.3 Semi-Guarded Machine (IC01)................................................................................1-121.25.4 Guarded Machine (IC01) .........................................................................................1-121.25.5 Dripproof Guarded Machine (IC01) .........................................................................1-151.25.6 Open Independently Ventilated Machine (IC06)......................................................1-151.25.7 Open Pipe-Ventilated Machine................................................................................1-151.25.8 Weather-Protected Machine....................................................................................1-151.26 TOTALLY ENCLOSED MACHINE .....................................................................................1-151.26.1 Totally Enclosed Nonventilated Machine (IC410)....................................................1-151.26.2 Totally Enclosed Fan-Cooled Machine....................................................................1-151.26.3 Totally Enclosed Fan-Cooled Guarded Machine (IP54, IC411) ..............................1-161.26.4 Totally Enclosed Pipe-Ventilated Machine (IP44) ...................................................1-161.26.5 Totally Enclosed-Water-Cooled Machine (IP54) .....................................................1-161.26.6 Water-Proof Machine (IP55) ....................................................................................1-161.26.7 Totally Enclosed Air-to-Water-Cooled Machine (IP54)............................................1-161.26.8 Totally Enclosed Air-to-Air Cooled Machine (IP54) .................................................1-161.26.9 Totally Enclosed Air-Over Machine (IP54, IC417)...................................................1-161.26.10 Explosion-Proof Machine.......................................................................................1-171.26.11 Dust-Ignition-Proof Machine ..................................................................................1-171.27 MACHINE WITH ENCAPSULATED OR SEALED WINDINGS..........................................1-171.27.1 Machine with Moisture Resistant Windings.............................................................1-171.27.2 Machine with Sealed Windings................................................................................1-17CLASSIFICATION ACCORDING TO VARIABILITY OF SPEED ..................................................1-171.30 CONSTANT-SPEED MOTOR............................................................................................1-171.31 VARYING-SPEED MOTOR................................................................................................1-171.32 ADJUSTABLE-SPEED MOTOR.........................................................................................1-181.33 BASE SPEED OF AN ADJUSTABLE-SPEED MOTOR.....................................................1-181.34 ADJUSTABLE VARYING-SPEED MOTOR........................................................................1-181.35 MULTISPEED MOTOR.......................................................................................................1-18RATING, PERFORMANCE, AND TEST.........................................................................................1-181.40 RATING OF A MACHINE ...................................................................................................1-181.40.1 Continuous Rating ...................................................................................................1-181.40.2 Short-Time Rating....................................................................................................1-181.41 EFFICIENCY.......................................................................................................................1-181.41.1 General ....................................................................................................................1-181.41.2 Energy Efficient Polyphase Squirrel-Cage Induction Motor ....................................1-181.42 SERVICE FACTORAC MOTORS...................................................................................1-191.43 SPEED REGULATION OF DC MOTORS..........................................................................1-191.43.1 Percent Compounding of Direct-Current Machines.................................................1-191.44 VOLTAGE REGULATION OF DIRECT-CURRENT GENERATORS.................................1-191.45 SECONDARY VOLTAGE OF WOUND-MOTOR ROTORS...............................................1-191.46 FULL-LOAD TORQUE........................................................................................................1-191.47 LOCKED-ROTOR TORQUE (STATIC TORQUE)..............................................................1-191.48 PULL-UP TORQUE ............................................................................................................1-19MG 1-2003Page iii1.49 PUSHOVER TORQUE .......................................................................................................1-191.50 BREAKDOWN TORQUE....................................................................................................1-191.51 PULL-OUT TORQUE..........................................................................................................1-201.52 PULL-IN TORQUE..............................................................................................................1-201.53 LOCKED-ROTOR CURRENT ............................................................................................1-201.54 NO-LOAD CURRENT ........................................................................................................1-201.55 TEMPERATURE TESTS....................................................................................................1-201.56 AMBIENT TEMPERATURE................................................................................................1-201.57 HIGH-POTENTIAL TESTS.................................................................................................1-201.58 STARTING CAPACITANCE FOR A CAPACITOR MOTOR ..............................................1-201.59 RADIAL MAGNETIC PULL AND AXIAL CENTERING FORCE.........................................1-201.59.1 Radial Magnetic Pull ................................................................................................1-201.59.2 Axial Centering Force ..............................................................................................1-201.60 INDUCTION MOTOR TIME CONSTANTS.........................................................................1-211.60.1 General ....................................................................................................................1-211.60.2 Open-Circuit AC Time Constant ..............................................................................1-211.60.3 Short-Circuit AC Time Constant ..............................................................................1-211.60.4 Short-Circuit DC Time Constant ..............................................................................1-211.60.5 X/R Ratio..................................................................................................................1-211.60.6 Definitions (See Figure 1-4).....................................................................................1-21COMPLETE MACHINES AND PARTS...........................................................................................1-221.61 SYNCHRONOUS GENERATORCOMPLETE................................................................1-221.61.1 Belted Type..............................................................................................................1-221.61.2 Engine Type.............................................................................................................1-221.61.3 Coupled Type...........................................................................................................1-221.62 DIRECT-CURRENT GENERATORCOMPLETE............................................................1-221.62.1 Belted Type..............................................................................................................1-221.62.2 Engine Type.............................................................................................................1-221.62.3 Coupled Type...........................................................................................................1-221.63 FACE AND FLANGE MOUNTING......................................................................................1-221.63.1 Type C Face ............................................................................................................1-221.63.2 Type D Flange .........................................................................................................1-231.63.3 Type P Flange..........................................................................................................1-23CLASSIFICATION OF INSULATION SYSTEMS ...........................................................................1-231.65 INSULATION SYSTEM DEFINED......................................................................................1-231.65.1 Coil Insulation with its Accessories..........................................................................1-231.65.2 Connection and Winding Support Insulation ...........................................................1-231.65.3 Associated Structural Parts .....................................................................................1-231.66 CLASSIFICATION OF INSULATION SYSTEMS ...............................................................1-23MISCELLANEOUS..........................................................................................................................1-241.70 NAMEPLATE MARKING....................................................................................................1-241.71 CODE LETTER...................................................................................................................1-241.72 THERMAL PROTECTOR...................................................................................................1-241.73 THERMALLY PROTECTED...............................................................................................1-241.74 OVER TEMPERATURE PROTECTION.............................................................................1-251.75 PART-WINDING START MOTOR......................................................................................1-251.76 STAR (WYE) START, DELTA RUN MOTOR.....................................................................1-251.77 CONSTANT FLUX..............................................................................................................1-251.78 MARKING ABBREVIATIONS FOR MACHINES ................................................................1-25MG 1-2003Page ivSection I GENERAL STANDARDS APPLYING TO ALL MACHINESPart 2TERMINAL MARKINGSGENERAL .........................................................................................................................................2-12.1 LOCATION OF TERMINAL MARKINGS..............................................................................2-12.2 TERMINAL MARKINGS........................................................................................................2-12.3 DIRECTION OF ROTATION ................................................................................................2-22.3.1 Alternating-Current Machines.....................................................................................2-22.3.2 Direct-Current Machines.............................................................................................2-22.3.3 Motor-Generator Sets.................................................................................................2-2DC MOTORS AND GENERATORS..................................................................................................2-22.10 TERMINAL MARKINGS........................................................................................................2-22.10.1 General ......................................................................................................................2-22.10.2 Armature Leads .........................................................................................................2-22.10.3 Armature LeadsDirection of Rotation.....................................................................2-22.11 TERMINAL MARKINGS FOR DUAL VOLTAGE SHUNT FIELDS.......................................2-22.12 DIRECTION OF ROTATION ................................................................................................2-32.12.1 Direct-Current Motors ................................................................................................2-32.12.2 Direct-Current Generators .........................................................................................2-32.12.3 Reverse Function.......................................................................................................2-32.13 CONNECTION DIAGRAMS WITH TERMINAL MARKINGS FORDIRECT-CURRENT MOTORS.............................................................................................2-32.14 CONNECTION DIAGRAMS WITH TERMINAL MARKINGS FORDIRECT-CURRENT GENERATORS ...................................................................................2-7AC MOTORS AND GENERATORS..................................................................................................2-92.20 NUMERALS ON TERMINALS OF ALTERNATING-CURRENTPOLYPHASE MACHINES....................................................................................................2-92.20.1 Synchronous Machines .............................................................................................2-92.20.2 Induction Machines....................................................................................................2-92.21 DEFINITION OF PHASE SEQUENCE.................................................................................2-92.22 PHASE SEQUENCE.............................................................................................................2-92.23 DIRECTION OF ROTATION OF PHASORS........................................................................2-92.24 DIRECTION OF ROTATION ..............................................................................................2-10AC GENERATORS AND SYNCHRONOUS MOTORS..................................................................2-102.25 REVERSAL OF ROTATION, POLARITY AND PHASE SEQUENCE................................2-102.30 CONNECTION AND TERMINAL MARKINGSALTERNATING-CURRENT GENERATORS AND SYNCHRONOUS MOTORSTHREE-PHASE AND SINGLE-PHASE..............................................................................2-10SINGLE PHASE MOTORS .............................................................................................................2-112.40 GENERAL...........................................................................................................................2-112.40.1 Dual Voltage ............................................................................................................2-112.40.2 Single Voltage..........................................................................................................2-112.41 TERMINAL MARKINGS IDENTIFIED BY COLOR.............................................................2-122.42 AUXILIARY DEVICES WITHIN MOTOR............................................................................2-122.43 AUXILIARY DEVICES EXTERNAL TO MOTOR................................................................2-122.44 MARKING OF RIGIDLY MOUNTED TERMINALS.............................................................2-122.45 INTERNAL AUXILIARY DEVICES PERMANENTLY CONNECTEDTO RIGIDLY MOUNTED TERMINALS...............................................................................2-132.46 GENERAL PRINCIPLES FOR TERMINAL MARKINGS FORSINGLE-PHASE MOTORS ................................................................................................2-132.46.1 First Principle ...........................................................................................................2-132.46.2 Second Principle......................................................................................................2-132.46.3 Third Principle..........................................................................................................2-132.47 SCHEMATIC DIAGRAMS FOR SPLIT-PHASE MOTORSSINGLE VOLTAGEREVERSIBLE ..................................................................................2-142.47.1 Without Thermal Protector.......................................................................................2-142.47.2 With Thermal Protector............................................................................................2-14MG 1-2003Page v 2.48 SCHEMATIC DIAGRAMS FOR CAPACITOR-START MOTORSREVERSIBLE .....................................................................................................................2-152.48.1 Single-Voltage Capacitor-start MotorsReversible................................................2-152.48.2 Dual-Voltage Capacitor-start MotorsReversible...................................................2-162.49 SCHEMATIC DIAGRAMS FOR TWO-VALUE CAPACITORMOTORSSINGLE VOLTAGEREVERSIBLE...............................................................2-202.49.1 Without Thermal Protector.......................................................................................2-202.49.2 With Thermal Protector............................................................................................2-212.50 SCHEMATIC DIAGRAMS FOR PERMANENT-SPLIT CAPACITORMOTORSSINGLE VOLTAGEREVERSIBLE...............................................................2-222.51 SCHEMATIC DIAGRAMS FOR UNIVERSAL MOTORSSINGLE VOLTAGE.............................................................................................................2-232.52 SCHEMATIC DIAGRAMS FOR REPULSION, REPULSION-STARTINDUCTION, AND REPULSION-INDUCTION MOTORS..................................................2-242.53 SHADED-POLE MOTORSTWO SPEED........................................................................2-252.60 GENERAL PRINCIPLES FOR TERMINAL MARKINGS FORPOLYPHASE INDUCTION MOTORS................................................................................2-252.60.1 General ....................................................................................................................2-252.60.2 Three-Phase, Two Speed Motors............................................................................2-262.60.3 Two-Phase Motors...................................................................................................2-262.61 TERMINAL MARKINGS FOR THREE-PHASE SINGLE-SPEEDINDUCTION MOTORS.......................................................................................................2-262.61.1 First ..........................................................................................................................2-262.61.2 Second.....................................................................................................................2-262.61.3 Third.........................................................................................................................2-262.61.4 Fourth.......................................................................................................................2-262.61.5 Fifth..........................................................................................................................2-262.61.6 Sixth.........................................................................................................................2-262.62 TERMINAL MARKINGS FOR Y- AND DELTA-CONNECTEDDUAL VOLTAGE MOTORS ...............................................................................................2-272.63 TERMINAL MARKINGS FOR THREE-PHASE TWO-SPEEDSINGLE-WINDING INDUCTION MOTORS........................................................................2-272.64 TERMINAL MARKINGS FOR Y- AND DELTA-CONNECTEDTHREE-PHASE TWO-SPEED SINGLE-WINDING MOTORS...........................................2-272.65 TERMINAL MARKINGS FOR THREE-PHASE INDUCTIONMOTORS HAVING TWO OR MORE SYNCHRONOUS SPEEDSOBTAINED FROM TWO OR MORE INDEPENDENT WINDINGS....................................2-332.65.1 Each Independent Winding Giving One Speed.......................................................2-332.65.2 Each Independent Winding Reconnectible to Give Two Synchronous Speeds...............................................................................................2-332.65.3 Two or More Independent Windings at Least One of WhichGives One Synchronous Speed and the Other WindingGives Two Synchronous Speeds.............................................................................2-342.66 TERMINAL MARKINGS OF THE ROTORS OF WOUND-ROTORINDUCTION MOTORS.......................................................................................................2-35Section I GENERAL STANDARDS APPLYING TO ALL MACHINESPart 3HIGH-POTENTIAL TESTS3.1 HIGH-POTENTIAL TESTS...................................................................................................3-13.1.1 Safety..........................................................................................................................3-13.1.2 Definition.....................................................................................................................3-13.1.3 Procedure ...................................................................................................................3-13.1.4 Test Voltage................................................................................................................3-13.1.5 Condition of Machine to be Tested.............................................................................3-13.1.6 Duration of Application of Test Voltage ......................................................................3-13.1.7 Points of Application of Test Voltage..........................................................................3-2MG 1-2003Page vi3.1.8 Accessories and Components....................................................................................3-23.1.9 Evaluation of Dielectric Failure ...................................................................................3-23.1.10 Initial Test at Destination ...........................................................................................3-23.1.11 Tests of an Assembled Group of Machines and Apparatus......................................3-23.1.12 Additional Tests Made After Installation ....................................................................3-3Section I GENERAL STANDARDS APPLYING TO ALL MACHINESPart 4DIMENSIONS, TOLERANCES, AND MOUNTING4.1 LETTERING OF DIMENSION SHEETS...............................................................................4-14.2 SYSTEM FOR DESIGNATING FRAMES...........................................................................4-104.2.1 Frame Numbers........................................................................................................4-104.2.2 Frame Letters............................................................................................................4-114.3 MOTOR MOUNTING AND TERMINAL HOUSING LOCATION.........................................4-12Figure 4-6............................................................................................................................4-134.4 DIMENSIONSAC MACHINES ........................................................................................4-144.4.1 Dimensions for Alternating-Current Foot-MountedMachines with Single Straight-Shaft Extension ........................................................4-144.4.2 Shaft Extensions and Key Dimensions for Alternating- Current Foot-Mounted Machines with Single Tapered or Double Straight/Tapered Shaft Extension ................................................................4-164.4.3 Shaft Extension Diameters and Key Dimensions for Alternating-Current Motors Built in Frames Larger than the 449T Frames ..............4-174.4.4 Dimensions for Type C Face-Mounting Foot or Footless Alternating-Current Motors........................................................................................4-174.4.5 Dimensions for Type FC Face Mounting for Accessorieson End of Alternating-Current Motors .......................................................................4-184.4.6 Dimensions for Type D Flange-Mounting Foot or Footless Alternating-Current Motors........................................................................................4-194.5 DIMENSIONSDC MACHINES........................................................................................4-204.5.1 Dimensions for Direct-Current Small Motors with Single Straight Shaft Extension ................................................................................4-204.5.2 Dimensions for Foot-Mounted Industrial Direct-Current Machines ..........................4-214.5.3 Dimensions for Foot-Mounted Industrial Direct-Current Motors...............................4-254.5.4 Dimensions for Type C Face-Mounting Direct-Current Small Motors .............................................................................................................4-264.5.5 Dimensions for Type C Face-Mounting Industrial Direct-Current Motors................4-264.5.6 Dimensions for Type C Face-Mounting Industrial Direct-Current Motors.................4-274.5.7 Dimensions for Type D Flange-Mounting Industrial Direct-Current Motors .............4-274.5.8 Base Dimensions for Type P and PH Vertical Solid-Shaft Industrial Direct-Current Motors................................................................................4-284.5.9 Dimensions for Type FC Face Mounting for Accessorieson End Opposite Drive End of Industrial Direct-Current Motors...............................4-284.6 SHAFT EXTENSION DIAMETERS FOR UNIVERSAL MOTORS.....................................4-284.7 TOLERANCE LIMITS IN DIMENSIONS.............................................................................4-294.8 KNOCKOUT AND CLEARANCE HOLE DIAMETER FOR MACHINETERMINAL BOXES ............................................................................................................4-294.9 TOLERANCES ON SHAFT EXTENSION DIAMETERS ANDKEYSEATS.........................................................................................................................4-294.9.1 Shaft Extension Diameter .........................................................................................4-294.9.2 Keyseat Width...........................................................................................................4-294.9.3 Bottom of Keyseat to Shaft Surface..........................................................................4-294.9.4 Parallelism ................................................................................................................4-304.9.5 Lateral Displacement ................................................................................................4-304.9.6 Diameters and Keyseat Dimensions ........................................................................4-304.9.7 Shaft Runout .............................................................................................................4-304.10 RING GROOVE SHAFT KEYSEATS FOR VERTICAL SHAFT MOTORS........................4-32MG 1-2003, Rev 1-2004Page vii4.11 METHOD OF MEASUREMENT OF SHAFT RUNOUT AND OFELECTRICITY AND FACE RUNOUT OF MOUNTING SURFACES .................................4-324.11.1 Shaft Runout ............................................................................................................4-324.11.2 Eccentricity and Face Runout of Mounting Surfaces...............................................4-324.12 TOLERANCES FOR TYPE C FACE MOUNTING AND TYPE DFLANGE MOUNTING MOTORS........................................................................................4-324.13 TOLERANCES FOR TYPE P FLANGE-MOUNTING MOTORS........................................4-334.14 MOUNTING BOLTS OR STUDS........................................................................................4-334.15 METHOD TO CHECK COPLANARITY OF FEET OF FULLYASSEMBLED MOTORS.....................................................................................................4-344.16 METHOD OF MEASUREMENT OF SHAFT EXTENSIONPARALLELISM TO FOOT PLANE .....................................................................................4-344.17 MEASUREMENT OF BEARING TEMPERATURE............................................................4-344.18 TERMINAL CONNECTIONS FOR SMALL MOTORS........................................................4-354.18.1 Terminal Leads ........................................................................................................4-354.18.2 Blade Terminals.......................................................................................................4-354.19 MOTOR TERMINAL HOUSINGS.......................................................................................4-354.19.1 Small and Medium Motors.......................................................................................4-354.19.2 Dimensions ..............................................................................................................4-354.19.2.1 Terminal Housings for Wire-to-wire Connections Small and Medium Machines...................................................................4-354.20 GROUNDING MEANS FOR FIELD WIRING.....................................................................4-41Section I GENERAL STANDARDS APPLYING TO ALL MACHINESPart 5ROTATING ELECTRICAL MACHINESCLASSIFICATION OFDEGREES OF PROTECTION PROVIDED BY ENCLOSURES FORROTATING MACHINES5.1 SCOPE .................................................................................................................................5-15.2 DESIGNATION ................................................................................................................5-15.2.1 Single Characteristic Numeral ....................................................................................5-15.2.2 Supplementary Letters................................................................................................5-15.2.3 Example of Designation..............................................................................................5-25.2.4 Most Frequently Used.................................................................................................5-25.3 DEGREES OF PROTECTIONFIRST CHARACTERISTIC NUMERAL............................5-25.3.1 Indication of Degree of Protection ..............................................................................5-25.3.2 Compliance to Indicated Degree of Protection...........................................................5-25.3.3 External Fans..............................................................................................................5-25.3.4 Drain Holes .................................................................................................................5-3Table 5-1 .........................................................................................................................5-35.4 DEGREES OF PROTECTIONSECOND CHARACTERISTIC NUMERAL.......................5-45.4.1 Indication of Degree of Protection .........................................................................5-45.4.2 Compliance to Indicated Degree of Protection...........................................................5-4Table 5-2 .........................................................................................................................5-45.5 MARKING.............................................................................................................................5-55.6 GENERAL REQUIREMENTS FOR TESTS ....................................................................5-55.6.1 Adequate Clearance...................................................................................................5-55.7 TESTS FOR FIRST CHARACTERISTIC NUMERAL .....................................................5-5Table 5-3 .........................................................................................................................5-65.8 TESTS FOR SECOND CHARACTERISTIC NUMERAL......................................................5-75.8.1 Test Conditions .....................................................................................................5-7Table 5-4...............................................................................................................................5-85.8.2 Acceptance Conditions .......................................................................................5-105.8.3 Allowable Water Leakage.........................................................................................5-105.9 REQUIREMENTS AND TESTS FOR OPEN WEATHER-PROTECTED MACHINES.......5-10Figure 5-1 ......................................................................................................................5-11MG 1-2003, Rev 1-2004Page viiiFigure 5-2 ......................................................................................................................5-12Figure 5-3 ......................................................................................................................5-13Figure 5-4 ......................................................................................................................5-14Figure 5-5 ......................................................................................................................5-15Figure 5-6 ......................................................................................................................5-16Section I GENERAL STANDARDS APPLICABLE TO ALL MACHINESPart 6ROTATING ELECTRICAL MOTORSMETHODS OF COOLING (IC CODE)6.1 SCOPE .................................................................................................................................6-16.2 DEFINITIONS.......................................................................................................................6-16.2.1 Cooling........................................................................................................................6-16.2.2 Coolant........................................................................................................................6-16.2.3 Primary Coolant ..........................................................................................................6-16.2.4 Secondary Coolant .....................................................................................................6-16.2.5 Final Coolant...............................................................................................................6-16.2.6 Surrounding Medium ..................................................................................................6-16.2.7 Remote Medium..........................................................................................................6-26.2.8 Direct Cooled Winding (Inner cooled Winding)...........................................................6-26.2.9 Indirect Cooled Winding..............................................................................................6-26.2.10 Heat Exchange ..........................................................................................................6-26.2.11 Pipe, Duct ..................................................................................................................6-26.2.12 Open Circuit ...............................................................................................................6-26.2.13 Closed Circuit.............................................................................................................6-26.2.14 Piped or Ducted Circuit..............................................................................................6-26.2.15 Stand-by or Emergency Cooling System...................................................................6-26.2.16 Integral Component ...................................................................................................6-26.2.17 Machine-Mounted Component ..................................................................................6-36.2.18 Separate Component.................................................................................................6-36.2.19 Dependent Circulation Component ...........................................................................6-36.2.20 Independent Circulation Component .........................................................................6-36.3 DESIGNATION SYSTEM.....................................................................................................6-36.3.1 Arrangement of the IC Code.......................................................................................6-36.3.2 Application of Designations ........................................................................................6-46.3.3 Designation of Same Circuit Arrangements for Different Parts of a Machine......................................................................................................6-46.3.4 Designation of Different Circuit Arrangements for Different Parts of a Machine......................................................................................................6-46.3.5 Designation of Direct Cooled Winding........................................................................6-56.3.6 Designation of Stand-by or Emergency Cooling Conditions ......................................6-56.3.7 Combined Designations..............................................................................................6-56.3.8 Replacement of Characteristic Numerals...................................................................6-56.4 CHARACTERISTIC NUMERAL FOR CIRCUIT ARRANGEMENT......................................6-56.5 CHARACTERISTIC LETTERS FOR COOLANT..................................................................6-66.6 CHARACTERISTIC NUMERAL FOR METHOD OF MOVEMENT ......................................6-76.7 COMMONLY USED DESIGNATIONS .................................................................................6-86.7.1 General Information on the Tables .............................................................................6-8Section I GENERAL STANDARDS APPLYING TO ALL MACHINESPart 7MECHANICAL VIBRATION-MEASUREMENT, EVALUATION AND LIMITS(Entire Section Replaced)7.1 SCOPE .................................................................................................................................7-17.2 OBJECT................................................................................................................................7-17.3 REFERENCES .....................................................................................................................7-17.4 MEASUREMENT QUANTITY...............................................................................................7-17.4.1 Bearing Housing Vibration..........................................................................................7-17.4.2 Relative Shaft Vibration ..............................................................................................7-1MG 1-2003Page ix7.5 MEASUREMENT EQUIPMENT ...........................................................................................7-27.6 MACHINE MOUNTING.........................................................................................................7-27.6.1 General .......................................................................................................................7-27.6.2 Resilient Mounting ......................................................................................................7-27.6.3 Rigid Mounting............................................................................................................7-27.6.4 Active Environment Determination .............................................................................7-37.7 CONDITIONS OF MEASUREMENT....................................................................................7-37.7.1 Shaft Key ....................................................................................................................7-37.7.2 Measurement Points for Vibration ..............................................................................7-37.7.3 Operating Conditions..................................................................................................7-47.7.4 Vibration Transducer Mounting...................................................................................7-47.8 LIMITS OF BEARING HOUSING VIBRATION.....................................................................7-77.8.1 General .......................................................................................................................7-77.8.2 Vibration Limits for Standard Machines......................................................................7-97.8.3 Vibration Limits for Special Machines.........................................................................7-97.8.4 Vibration Banding for Special Machines.....................................................................7-97.8.5 Twice Line Frequency Vibration of Two Pole Induction Machines...........................7-107.8.6 Axial Vibration...........................................................................................................7-117.9 LIMITS OF RELATIVE SHAFT VIBRATION.......................................................................7-117.9.1 General .....................................................................................................................7-117.9.2 Standard Machines...................................................................................................7-127.9.3 Special Machines......................................................................................................7-12Section I GENERAL STANDARDS APPLYING TO ALL MACHINESPart 9ROTATING ELECTRICAL MOTORSSOUND POWER LIMITSAND MEASUREMENT PROCEDURES9.1 SCOPE .................................................................................................................................9-19.2 GENERAL.............................................................................................................................9-19.3 REFERENCES .....................................................................................................................9-19.4 METHODS OF MEASUREMENT.........................................................................................9-19.5 TEST CONDITIONS.............................................................................................................9-29.5.1 Machine Mounting ......................................................................................................9-29.5.2 Test Operating Conditions..........................................................................................9-29.6 SOUND POWER LEVEL......................................................................................................9-29.7 DETERMINATION OF SOUND PRESSURE LEVEL...........................................................9-3Table 9-1...............................................................................................................................9-4Table 9-2...............................................................................................................................9-5Table 9-3...............................................................................................................................9-5Table 9-4...............................................................................................................................9-6Section II SMALL (FRACTIONAL) AND MEDIUM (INTEGRAL) MACHINESPart 10AC SMALL AND MEDIUM MOTORS10.0 SCOPE ...............................................................................................................................10-110.30 VOLTAGES.........................................................................................................................10-110.31 FREQUENCIES..................................................................................................................10-110.31.1 Alternating-Current Motors ....................................................................................10-110.31.2 Universal Motors....................................................................................................10-110.32 HORSEPOWER AND SPEED RATINGS...........................................................................10-210.32.1 Small Induction Motors, Except Permanent-Split CapacitorMotors Rated 1/3 Horsepower and Smaller and Shaded- Pole Motors.............................................................................................................10-210.32.2 Small induction Motors, permanent-Split Capacitor Motors Rated 1/3 Horsepower and Smaller and Shaded-Pole Motors...............................10-210.32.3 Single-Phase Medium Motors................................................................................10-310.32.4 Polyphase Medium Induction Motors ....................................................................10-310.32.5 Universal Motors....................................................................................................10-4MG 1-2003Page x10.33 HORSEPOWER RATINGS OF MULTISPEED MOTORS .................................................10-410.33.1 Constant Horsepower ............................................................................................10-410.33.2 Constant Torque....................................................................................................10-510.34 BASIS FOR HORSEPOWER RATING...............................................................................10-510.34.1 Basis of Rating.......................................................................................................10-510.34.2 Temperature ..........................................................................................................10-510.34.3 Minimum Breakdown Torque.................................................................................10-510.35 SECONDARY DATA FOR WOUND-ROTOR-MOTORS ...................................................10-810.36 TIME RATINGS FOR SINGLE-PHASE AND POLYPHASEINDUCTION MOTORS.......................................................................................................10-810.37 CODE LETTERS (FOR LOCKED-ROTOR KVA)...............................................................10-810.37.1 Nameplate Marking................................................................................................10-810.37.2 Letter Designation..................................................................................................10-810.37.3 Multispeed Motors .................................................................................................10-810.37.4 Single-Speed Motors .............................................................................................10-910.37.5 Broad- or Dual-Voltage Motors..............................................................................10-910.37.6 Dual-Frequency Motors .........................................................................................10-910.37.7 Part-Winding-Start Motors .....................................................................................10-910.38 NAMEPLATE TEMPERATURE RATINGS FOR ALTERNATING-CURRENT SMALL AND UNIVERSAL MOTORS ..............................................................10-910.39 NAMEPLATE MARKING FOR ALTERNATING-CURRENT SMALLAND UNIVERSAL MOTORS..............................................................................................10-910.39.1 Alternating-Current Single-Phase and Polyphase Squirrel- Cage Motors, Except Those Included in 10.39.2, 10.39.3,and 10.39.4 .............................................................................................................10-910.39.2 Motors Rated Less than 1/20 Horsepower ..........................................................10-1010.39.3 Universal Motors..................................................................................................10-1010.39.4 Motors Intended for Assembly in a Device Having itsOwn Markings .......................................................................................................10-1010.39.5 Motors for Dual Voltage.......................................................................................10-1010.39.6 Additional Nameplate Information .......................................................................10-1110.40 NAMEPLATE MARKING FOR MEDIUM SINGLE-PHASE ANDPOLYPHASE INDUCTION MOTORS..............................................................................10-1110.40.1 Medium Single-Phase and Polyphase Squirrel-Cage Motors .............................10-1110.40.2 Polyphase Wound-Rotor Motors..........................................................................10-12Section II SMALL (FRACTIONAL) AND MEDIUM (INTEGRAL) MACHINESPart 10DC SMALL AND MEDIUM MOTORS10.0 SCOPE .............................................................................................................................10-1310.60 BASIS OF RATING...........................................................................................................10-1310.60.1 Small Motors........................................................................................................10-1310.60.2 Medium Motors....................................................................................................10-1310.61 POWER SUPPLY IDENTIFICATION FOR DIRECT-CURRENTMEDIUM MOTORS...........................................................................................................10-1310.60.1 Supplies Designated by a Single Letter...............................................................10-1310.60.2 Other Supply Types .............................................................................................10-1310.62 HORSEPOWER, SPEED, AND VOLTAGE RATINGS ....................................................10-1410.62.1 Direct-Current Small Motors ................................................................................10-1410.62.2 Industrial Direct-Current Motors...........................................................................10-1510.63 NAMEPLATE TIME RATING............................................................................................10-1510.64 TIME RATING FOR INTERMITTENT, PERIODIC, AND VARYINGDUTY ................................................................................................................................10-1510.65 NAMEPLATE MAXIMUM AMBIENT TEMPERATURE ANDINSULATION SYSTEM CLASS........................................................................................10-1510.66 NAMEPLATE MARKING..................................................................................................10-1710.66.1 Small Motors Rated 1/20 Horsepower and Less.................................................10-17MG 1-2003Page xi10.66.2 Small Motors Except Those Rated 1/20 Horsepower andLess.......................................................................................................................10-1810.66.3 Medium Motors....................................................................................................10-18Section II SMALL (FRACTIONAL) AND MEDIUM (INTEGRAL) MACHINESPart 12TESTS AND PERFORMANCEAC AND DC MOTORS12.0 SCOPE ...............................................................................................................................12-112.2 HIGH-POTENTIAL TESTSAFETY PRECAUTIONSAND TEST PROCEDURE..................................................................................................12-112.3 HIGH-POTENTIAL TEST VOLTAGES FOR UNIVERSAL, INDUCTION,AND DIRECT-CURRENT MOTORS..................................................................................12-112.4 PRODUCTION HIGH-POTENTIAL TESTING OF SMALL MOTORS................................12-212.4.1 Dielectric Test Equipment........................................................................................12-212.4.2 Evaluation of Insulation Systems by a Dielectric Test .............................................12-312.5 REPETITIVE SURGE TEST FOR SMALL AND MEDIUM MOTORS................................12-312.6 MECHANICAL VIBRATION................................................................................................12-312.7 BEARING LOSSESVERTICAL PUMP MOTORS...........................................................12-4Section II SMALL (FRACTIONAL) AND MEDIUM (INTEGRAL) MACHINESPart 12TESTS AND PERFORMANCEAC MOTORS12.0 SCOPE ...............................................................................................................................12-512.30 TEST METHODS................................................................................................................12-512.31 PERFORMANCE CHARACTERISTICS.............................................................................12-512.32 TORQUE CHARACTERISTICS OF SINGLE-PHASE GENERAL-PURPOSE INDUCTION MOTORS ....................................................................................12-512.32.1 Breakdown Torque ................................................................................................12-512.32.2 Locked-Rotor Torque of Small Motors...................................................................12-612.32.3 Locked-rotor Torque of Medium Motors ................................................................12-612.32.4 Pull-Up Torque of Medium Motors.........................................................................12-612.33 LOCKED-ROTOR CURRENT OF SINGLE-PHASE SMALL MOTORS.............................12-612.33.1 Design O and Design N Motors.............................................................................12-612.33.2 General-Purpose Motors .......................................................................................12-712.34 LOCKED-ROTOR CURRENT OF SINGLE-PHASE MEDIUMMOTORS, DESIGNS L AND M..........................................................................................12-712.35 LOCKED-ROTOR CURRENT OF 3-PHASE 60-HERTZ SMALL ANDMEDIUM SQUIRREL-CAGE INDUCTION MOTORS RATED AT230 VOLTS.........................................................................................................................12-712.35.1 60-Hertz Design B, C, and D Motors at 230 Volts.................................................12-712.35.2 50-Hertz Design B, C, and D Motors at 380 Volts.................................................12-912.36 INSTANTANEOUS PEAK VALUE OF INRUSH CURRENT..............................................12-912.37 TORQUE CHARACTERISTICS OF POLYPHASE SMALL MOTORS...............................12-912.38 LOCKED-ROTOR TORQUE OF SINGLE-SPEED POLYPHASESQUIRREL-CAGE MEDIUM MOTORS WITH CONTINUOUSRATINGS..........................................................................................................................12-1012.38.1 Design A and B Motors........................................................................................12-1012.38.2 Design C Motors ..................................................................................................12-1012.38.3 Design D Motors ..................................................................................................12-1112.39 BREAKDOWN TORQUE OF SINGLE-SPEED POLYPHASESQUIRREL-CAGE MEDIUM MOTORS WITH CONTINUOUSRATINGS..........................................................................................................................12-1112.39.1 Design A and B Motors........................................................................................12-1112.39.2 Design C Motors ..................................................................................................12-1112.40 PULL-UP TORQUE OF SINGLE-SPEED POLYPHASE SQUIRREL-CAGE MEDIUM MOTORS WITH CONTINUOUS RATINGS...........................................12-1212.40.1 Design A and B Motors........................................................................................12-1212.40.2 Design C Motors ..................................................................................................12-13MG 1-2003, Rev 1-2004Page xii12.41 BREAKDOWN TORQUE OF POLYPHASE WOUND-ROTOR MEDIUMMOTORS WITH CONTINUOUS RATINGS......................................................................12-1312.42 TEMPERATURE RISE FOR SMALL AND UNIVERSAL MOTORS.................................12-1412.42.1 Alternating-Current Small MotorsMotor NameplatesMarked with Insulation System Designation and AmbientTemperature..........................................................................................................12-1412.42.2 Universal Motors..................................................................................................12-1512.42.3 Temperature Rise for Ambients Higher than 40oC..............................................12-1512.43 TEMPERATURE RISE FOR MEDIUM SINGLE-PHASE ANDPOLYPHASE INDUCTION MOTORS..............................................................................12-1612.43.1 Temperature Rise for Ambients Higher than 40oC..............................................12-1612.44 VARIATION FROM RATED VOLTAGE AND RATED FREQUENCY..............................12-1612.44.1 Running................................................................................................................12-1612.44.2 Starting.................................................................................................................12-1712.45 VOLTAGE UNBALANCE..................................................................................................12-1712.46 VARIATION FROM RATED SPEED ................................................................................12-1712.47 NAMEPLATE AMPERESALTERNATING-CURRENT MEDIUMMOTORS..........................................................................................................................12-1712.48 OCCASIONAL EXCESS CURRENT................................................................................12-1712.49 STALL TIME .....................................................................................................................12-1712.50 PERFORMANCE OF MEDIUM MOTORS WITH DUAL VOLTAGERATING (SUGGESTED STANDARD FOR FUTURE DESIGN) ......................................12-1812.51 SERVICE FACTOR OF ALTERNATING-CURRENT MOTORS......................................12-1812.51.1 General-Purpose Alternating-Current Motors of the Open Type ...................12-1812.51.2 Other Motors ..................................................................................................12-1812.52 OVERSPEEDS FOR MOTORS........................................................................................12-1912.52.1 Squirrel-Cage and Wound-Rotor Motors.............................................................12-1912.52.2 General-Purpose Squirrel-Cage Induction Motors ..............................................12-19Table 12-5.........................................................................................................12-1912.52.3 General-Purpose Design A and B Direct-Coupled Drive Squirrel-Cage Induction Motors ..................................................................................................12-2012.52.4 Alternating-Current Series and Universal Motors................................................12-20Table 12-6..........................................................................................................12-2112.53 MACHINE SOUND (MEDIUM INDUCTION MOTORS) ...................................................12-2112.54 NUMBER OF STARTS.....................................................................................................12-2212.54.1 Normal Starting Conditions..................................................................................12-2212.54.2 Other than Normal Starting Conditions................................................................12-2212.54.3 Considerations for Additional Starts ....................................................................12-2212.55 ROUTINE TESTS FOR POLYPHASE MEDIUM INDUCTION MOTORS........................12-2212.55.1 Method of Testing................................................................................................12-2212.55.2 Typical Tests on Completely Assembled Motors.................................................12-2212.55.3 Typical of Tests on Motors Not Completely Assembled......................................12-2212.56 THERMAL PROTECTION OF MEDIUM MOTORS .........................................................12-2312.56.1 Winding Temperature ..........................................................................................12-2312.56.2 Trip Current..........................................................................................................12-2512.57 OVERTEMPERATURE PROTECTION OF MEDIUM MOTORS NOTMEETING THE DEFINITION OF "THERMALLY PROTECTED" .....................................12-2512.57.1 Type 1Winding Running and Locked Rotor Overtemperature Protection.............................................................................................................12-2512.57.2 Type 2Winding Running Overtemperature Protection.....................................12-2512.57.3 Type 3Winding Overtemperature Protection, Nonspecific Type......................12-2512.58 EFFICIENCY.....................................................................................................................12-2512.58.1 Determination of Motor Efficiency and Losses ....................................................12-2512.58.2 Efficiency of Polyphase Squirrel-Cage Medium Motors withContinuous Ratings .........................................................................................12-2612.59 EFFICIENCY LEVELS OF ENERGY EFFICIENT POLYPHASEMG 1-2003Page xiiiSQUIRREL-CAGE INDUCTION MOTORS......................................................................12-2712.60 EFFICIENCY LEVEL OF NEMA PREMIUM EFFICIENCY ELECTRIC MOTORS ..........12-2812.60.1 Motors Rated 600 Volts or Less (Random Wound).............................................12-2812.60.2 Motors Rated Medium Voltage, 5000 Volts or Less, (Form Wound)...................12-2812.61 REPORT OF TEST FOR TESTS ON INDUCTION MOTORS.........................................12-28Table 12-11.......................................................................................................................12-28Table 12-12.......................................................................................................................12-30Table 12-13.......................................................................................................................12-3212.62 MACHINE WITH ENCAPSULATED OR SEALED WINDINGCONFORMANCE TESTS.................................................................................................12-3212.63 MACHINE WITH MOISTURE RESISTANT WINDINGSCONFORMANCE TEST...................................................................................................12-33Section II SMALL (FRACTIONAL) AND MEDIUM (INTEGRAL) MACHINESPart 12TESTS AND PERFORMANCEDC SMALL AND MEDIUM MOTORS12.0 SCOPE .............................................................................................................................12-3512.65 TEST METHODS..............................................................................................................12-3512.66 TEST POWER SUPPLY...................................................................................................12-3512.66.1 Small Motors........................................................................................................12-3512.66.2 Medium Motors....................................................................................................12-3512.67 TEMPERATURE RISE .....................................................................................................12-3712.67.1 Direct-Current Small Motors ................................................................................12-3712.67.2 Continuous-Time-Rated Direct-Current Medium Motors.....................................12-3712.67.3 Short-Time-Rated Direct-Current Medium Motors...............................................12-3712.67.4 Temperature Rise for Ambients Higher than 40oC..............................................12-3712.68 VARIATION FROM RATED VOLTAGE............................................................................12-3912.69 VARIATION IN SPEED DUE TO LOAD...........................................................................12-3912.69.1 Straight-Shunt-Wound, Stabilized-Shunt-Wound, and Permanent-Magnet Direct-Current Motors ..........................................................12-3912.69.2 Compound-Wound Direct-Current Motors...........................................................12-3912.70 VARIATION IN BASE SPEED DUE TO HEATING..........................................................12-3912.70.1 Speed Variation with Temperature......................................................................12-3912.70.2 Resistance Variation with Temperature...............................................................12-4012.71 VARIATION FROM RATED SPEED ................................................................................12-4012.72 MOMENTARY OVERLOAD CAPACITY ..........................................................................12-4012.73 SUCCESSFUL COMMUTATION .....................................................................................12-4012.74 OVERSPEEDS FOR MOTORS........................................................................................12-4012.74.1 Shunt-Wound Motors...........................................................................................12-4012.74.2 Compound-Wound Motors Having Speed Regulation of35 Percent or Less...............................................................................................12-4012.74.3 Series-Wound Motors and Compound-Wound Motors Having Speed Regulation Greater Than 35 Percent .......................................................12-4012.75 FIELD DATA FOR DIRECT-CURRENT MOTORS ..........................................................12-4112.76 ROUTINE TESTS ON MEDIUM DIRECT-CURRENT MOTORS.....................................12-4112.77 REPORT OF TEST FORM FOR DIRECT-CURRENT MACHINES.................................12-4112.78 EFFICIENCY.....................................................................................................................12-4112.78.1 Type A Power Supplies .......................................................................................12-4112.78.2 Other Power Supplies..........................................................................................12-4212.79 STABILITY........................................................................................................................12-4212.80 OVER TEMPERATURE PROTECTION OF MEDIUM DIRECT-CURRENT MOTORS........................................................................................................12-4212.81 DATA FOR DIRECT CURRENT MOTORS......................................................................12-4312.82 MACHINE SOUND OF DIRECT-CURRENT MEDIUM MOTORS ...................................12-44Section II SMALL (FRACTIONAL) AND MEDIUM (INTEGRAL) MACHINESPart 13FRAME ASSIGNMENTS FOR ALTERNATING CURRENTMG 1-2003Page xivINTEGRAL HORSEPOWER INDUCTION MOTORS13.0 SCOPE ...............................................................................................................................13-113.1 FRAME DESIGNATIONS FOR SINGLE-PHASE DESIGN L,HORIZONTAL, AND VERTICAL MOTORS, 60 HERTZCLASS B INSULATION SYSTEM, OPEN TYPE, 1.15SERVICE FACTOR, 230 VOLTS AND LESS.....................................................................13-113.2 FRAME DESIGNATIONS FOR POLYPHASE, SQUIRREL-CAGE,DESIGNS A, B, AND E, HORIZONTAL AND VERTICAL MOTORS,60 HERTZ, CLASS B INSULATION SYSTEM, OPEN TYPE, 1.15SERVICE FACTOR, 575 VOLTS AND LESS.....................................................................13-213.3 FRAME DESIGNATIONS FOR POLYPHASE, SQUIRREL-CAGE,DESIGNS A, B, ND E, HORIZONTAL AND VERTICAL MOTORS,60 HERTZ, CLASS B INSULATION SYSTEM, TOTALLY ENCLOSEDFAN-COOLED TYPE, 1.0 SERVICE FACTOR, 575 VOLTS AND LESS..........................13-313.4 FRAME DESIGNATIONS FOR POLYPHASE, SQUIRREL-CAGE,DESIGN C, HORIZONTAL AND VERTICAL MOTORS, 60 HERTZ,CLASS B INSULATION SYSTEM, OPEN TYPE, 1.15 SERVICEFACTOR, 575 VOLTS AND LESS .....................................................................................13-413.5 FRAME DESIGNATIONS FOR POLYPHASE, SQUIRREL-CAGE,DESIGN C, HORIZONTAL AND VERTICAL MOTORS, 60 HERTZ,CLASS B INSULATION SYSTEM, TOTALLY ENCLOSED FAN-COOLED TYPE, 1.0 SERVICE FACTOR, 575 VOLTS AND LESS...................................13-5SECTION II SMALL (FRACTIONAL) AND MEDIUM (INTEGRAL MACHINES)Part 14APPLICATION DATAAC AND DC SMALL AND MEDIUM MACHINES14.0 SCOPE ...............................................................................................................................14-114.1 PROPER SELECTION OF APPARATUS ..........................................................................14-114.2 USUAL SERVICE CONDITIONS .......................................................................................14-214.2.1 Environmental Conditions........................................................................................14-214.2.2 Operating Conditions...............................................................................................14-214.3 UNUSUAL SERVICE CONDITIONS..................................................................................14-214.4 TEMPERATURE RISE .......................................................................................................14-314.4.1 Motors with Class A or Class B Insulation Systems................................................14-314.4.2 Motors with Service Factor ......................................................................................14-314.4.3 Temperature Rise at Sea Level ...............................................................................14-314.4.4 Preferred Values of Altitude for Rating Motors........................................................14-414.5 SHORT-TIME RATED ELECTRICAL MACHINES.............................................................14-414.6 DIRECTION OF ROTATION ..............................................................................................14-414.7 APPLICATION OF PULLEYS, SHEAVES, SPROCKETS ANDGEARS ON MOTOR SHAFTS ...........................................................................................14-414.7.1 Mounting ..................................................................................................................14-414.7.2 Minimum Pitch Diameter for Drives Other than V-Belt ............................................14-414.7.3 Maximum Speed of Drive Components...................................................................14-514.8 THROUGH-BOLT MOUNTING ..........................................................................................14-514.9 RODENT PROTECTION....................................................................................................14-5SECTION II SMALL (FRACTIONAL) AND MEDIUM (INTEGRAL) MACHINES Part 14APPLICATION DATAAC SMALL AND MEDIUM MOTORS14.0 SCOPE ...............................................................................................................................14-714.30 EFFECTS OF VARIATION OF VOLTAGE AND FREQUENCY UPONTHE PERFORMANCE OF INDUCTION MOTORS............................................................14-714.30.1 General ..................................................................................................................14-714.30.2 Effects of Variation in Voltage on Temperature.....................................................14-714.30.3 Effect of Variation in Voltage on Power Factor......................................................14-714.30.4 Effect of Variation in Voltage on Starting Torques.................................................14-714.30.5 Effect of Variation in Voltage on Slip .....................................................................14-7MG 1-2003, Rev 1-2004Page xv14.30.6 Effects of Variation in Frequency...........................................................................14-814.30.7 Effect of Variations in Both Voltage and Frequency..............................................14-814.30.8 Effect on Special-Purpose or Small Motors...........................................................14-814.31 MACHINES OPERATING ON AN UNDERGROUND SYSTEM........................................14-814.32 OPERATION OF ALTERNATING CURRENT MOTORS FROMVARIABLE-FREQUENCY OR VARIABLE-VOLTAGE POWERSUPPLIES, OR BOTH........................................................................................................14-814.32.1 Performance ..........................................................................................................14-814.32.2 Shaft Voltages........................................................................................................14-914.33 EFFECTS OF VOLTAGES OVER 600 VOLTS ON THE PERFORMANCEOF LOW-VOLTAGE MOTORS...........................................................................................14-914.34 OPERATION OF GENERAL-PURPOSE ALTERNATING-CURRENTPOLYPHASE, 2-, 4-, 6-, AND 8-POLE, 60-HERTZ MEDIUMINDUCTION MOTORS OPERATED ON 50 HERTZ..........................................................14-914.34.1 Speed.....................................................................................................................14-914.34.2 Torques..................................................................................................................14-914.34.3 Locked-Rotor Current ..........................................................................................14-1014.34.4 Service Factor......................................................................................................14-1014.34.5 Temperature Rise................................................................................................14-1014.35 OPERATION OF 230-VOLT INDUCTION MOTORS ON 208-VOLTSYSTEMS.........................................................................................................................14-1014.35.1 General ................................................................................................................14-1014.35.2 Nameplate Marking of Useable @ 200 V............................................................14-1014.35.3 Effect on Performance of Motor...........................................................................14-1014.36 EFFECTS OF UNBALANCED VOLTAGES ON THE PERFORMANCEOF POLYPHASE INDUCTION MOTORS........................................................................14-1014.36.1 Effect on PerformanceGeneral.........................................................................14-1114.36.2 Unbalance Defined ..............................................................................................14-1114.36.3 Torques................................................................................................................14-1114.36.4 Full-Load Speed ..................................................................................................14-1114.36.5 Currents ...............................................................................................................14-1114.37 APPLICATION OF ALTERNATING-CURRENT MOTORS WITHSERVICE FACTORS........................................................................................................14-1214.37.1 General ................................................................................................................14-1214.37.2 Temperature RiseMedium Alternating-Current Motors....................................14-1214.37.3 Temperature RiseSmall Alternating-Current Motors........................................14-1214.38 CHARACTERISTICS OF PART-WINDING-START POLYPHASEINDUCTION MOTORS.....................................................................................................14-1214.39 COUPLING END-PLAY AND ROTOR FLOAT FOR HORIZONTALALTERNATING-CURRENT MOTORS.............................................................................14-1214.39.1 Preferred Hp Ratings for Motors with Ball Bearings............................................14-1214.39.2 Limits for Motors with Sleeze Bearings .........................................................


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