3.7 electrical drawings r1

7/25/2019 3.7 Electrical Drawings r1

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ELECTRICAL DRAWINGS

1. ELECTRICAL DIAGRAMS

Single Line DiagramSingle line diagram is the most commonly used diagram in an

industrial power system.

SLD uses single lines and standard graphical symbols toshow the power paths of an electrical circuit. SLD also shows

the component devices or parts of a power system. In SLDthe multiple conductors of power circuits and control circuitsare shown as single lines.


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Single Line Diagram (SLD) has multiple uses including:

- Interpreting the scope of a proposed installation of apower system.

- Serving as a basis to produce project drawings.

- Analyzing power system problems.

- Determining which circuit interrupters must be opened tosafely isolate electrical apparatus.


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Three-Line Diagrams

Three-line diagrams provide detailed information of three-phase

circuitry that is not shown on a SLD. Three-line diagrams ismore useful for plant maintenance and operations personnel tounderstand power system operations.

Three-Line Diagrams are also used to develop metering and

protective relay wiring drawings.A Three-Line diagram shows every conductor of a power circuitand represents power-system components using the samesymbols as a SLD and additional set of symbols that are also

used in schematic and wiring diagrams.


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Schematic Diagrams

Schematic diagrams show circuit elements and internal

connections in an arrangement that allows a technician tointerpret the function and operational logic of an electricalcontrol circuit.

Schematic diagrams are initially prepared in order to design an

electrical circuit.Schematic diagrams are composed using the samestandardized symbols as one-line, three-line, and wiringdiagrams. Schematic diagrams show all terminals and

connections of functional devices.

Schematic diagrams represent the operational sequencing ofthe circuit.


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Typical SLD


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1 32 54 6 87 109

H

G

F

E

D

C

B

A

Total SheetCont. Sheet

Sheet No. Revision No.

26

25

CONTROL SCHEMATIC FOR INCOMER -2

REV DATE DESCRIPTION CHKDDRAWN APPR

DWG NO.

DRAWING TITLE.

PROJECT.

SCHEME REF.

7

49

MOA PROJECT CUBAMAN DIESEL & TURBO

CANADA LTD.

SUB CONTRACTOR

END USER MANUFACTURER

ASSEMBLERMAIN CONTRACTOR

6111129910-MSB 01ARKSPKJGREVISED AS COMMENTED12/10/20111

ARKSPKJGChanged Incomer Colum Depth13/10/20112

ARKSPKSKREVISED AS PER COMMENTS20/11/20113

MOAENERGOIMPORT




ARKSPKSKAS BUILT-REV. AS PER FAT COMMENTS24/07/20127

LV MSB 01

110VDCControlSupply

+VESh. 23/1A

ACB Trip

K31 A1

A2

3134

32 25/4E

2124

22 25/10C

1114

12 26/3B

4144

42 .

CE1

QM2 311

314

312

18/3F

OF2

QM2 21

24

22

18/3F

ACB Closed

K42 A1

A2

K42 11

14

12

25/7F

Red

H21 X1

X2

K31 21

24

22

25/7FK42

21

24

22

25/7F

H22

Green Yellow

H23 X1

X2

3134

32 26/2B

2124

22 25/9C

1114

12 25/9C

4144

42 23/3C

SDE1

QM2 81

84

82

18/3F

ACB Closed

K43 A1

A2

3134

32 25/3E

2124

22 19/4C

1114

12 21/4C

4144

42 27/7C

Lamp Test

K5 A1

A2

3134

32 25/10C

2124

22 25/9C

1114

12 25/9C

4144

42 .

Lamp Test

S6

K5 11

14

12

25/8FK5

31

34

32

25/8FK5

21

24

22

25/8F

(External)

21

-CQ5DP MCB

CQ-OF

11 14

12.

43-VE

Sh. 23/1G

Cont. ShowsMotor Charge

SpringCharge Motor

B2

B1

B3 A2

A1

QM2

Local Close

S11 1

2

QBC2K43

21

24

22

23/7F

X6-2

X7-5

X7-6

X6-1

X7-1

X7-2

QBC1K432

1

24

22

21/7F

QM1K432

1

24

22

19/7F

BSI-1 Open

K241

44

42

27/9E

X7-57A

X7-57

CT1

QM2 911

912

914

18/3F

X7-3

X7-4

X6-5

X6-6X6-4

QM2

MN

D2

D1

X7-7

X7-8

X7-9

X7-10

X7-11

X7-12

PB 3

4.

OF1QM2

11

14

12

18/3F

BSG- Open

.

PF

251

252

.

Local Open

S12

Under VoltageRelease

K31 31

34

32

25/7F

S13L R

Local

Remote

Test Service

Local Close Remote Close Remote Open

R

1

2

.

EM.STOP

S5

Local Open

Local

HR A1

A2

3134

32 .

2124

22 .

1114

12 26/1F

4144

42 .

Remote

AR A1

A2

3134

32 .

2124

22 .

1114

12 26/2F

4144

42 .

Connected

KCE A1

A2

3134

32

2124

22

1114

12

4144

42 .

KCE 11

14

12

KCE 21

24

22

Typical Schematic Diagram


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Wiring Diagrams

A wiring diagram uses standardized symbols to show the

physical devices of an electrical control panel and lines to showthe wires that connect these devices to each other.

Wiring diagrams are used by equipment manufacturers to installwires in electrical equipment such as switchboard and panels.

They are also used to show the necessary interconnectionwiring between electrical equipment.

Wiring diagrams show functional devices in their correct relative

physical locations.Standardized and non-standard symbols are used to representthese functional devices.


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Lines are used to represent single conductors. Multipleconductors that are bundled together or that are installed in thesame channel are shown as a single line with radial branches

to show the locations where single conductors or other bundlesleave the path of the main-trunk bundle.

Each conductor is labeled with an identifying number.

Some wiring diagrams, do not show the complete path of everyconductor. Rather than showing the actual routing of aconductor, an origin and destination code is used to specify theterminating locations of the conductor.


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2. LAYOUT DRAWINGSA layout drawing or diagram shows the physicalarrangements of specific electrical equipment with reference

to surrounding Building and equipment. A layout drawingmight be in the form of a plan view, elevation view, or detail.The major types of layout drawings and diagrams are:

- cable and raceway drawings

- equipment layout drawings- underground, manhole drawings- overhead pole line layout drawings- lighting and receptacle plan drawings

- grounding drawings.


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Cable and Raceway Layout Drawings

Cable and raceway layout drawings are plan, elevation, and

sectional views that show cable and raceway routings inrelationship to building structures and show installationdetails.

Raceway types include the following:

Rigid metal conduit- Rigid nonmetallic conduit

- Flexible metallic conduit- Surface raceways- Underfloor raceways- Cable trays


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The purpose of a cable and raceway drawing is to show anelectrical contractor how to route and install cables betweenpieces of electrical equipment.

Cable and raceway layouts must be coordinated with otherequipment layouts such as piping, mechanical equipment,building architecture, structural supports, and ductwork.

Cable and raceway drawings are drawn generally to scaleand use the architectural or structural building columns andwalls as references. Major electrical equipment such asswitchgear, motor control centers, transformers, and

panelboards are generally drawn to scale. Symbols areutilized to represent raceways; for example, a single line isused to show a conduit. Figure 9 shows an undergroundconduit raceway layout drawing for an outdoor substation.


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Equipment Layout Drawings

Equipment layout drawings show how the major electrical

equipment are arranged to provide the necessary physicaland electrical clearances from all other components that arelocated in the vicinity.

Equipment layout drawings are used to determine the exact

location for each electrical equipment item. Equipment layoutsare generally drawn to scale with dimensions that associateeach piece of equipment to easily accessible reference points,such as building columns or a site grid. All piping, walls,

doorways, stairways, ductwork, building columns, and nearbyobstructions are shown to ensure equipment clearances andcoordination with all other trades.


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Grounding Drawings

A grounding drawing shows the routing of the equipment

grounding conductors, connectors, electrodes, jumpers, andgrid elements of a grounding system in relationship to theirphysical surroundings.

The purpose of a grounding drawing is to identify the intended

locations of equipment grounding conductors, connectors,electrodes, jumpers, and grid elements so that the contractorcan install the grounding system.

A grounding drawing is drawn to scale, and it typically uses

the equipment layout drawings as a background.


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3. ELECTRICAL SCHEDULESAn electrical schedule is a table that contains a list ofelectrical equipment and technical notes. Electrical schedules

save valuable time for site workers and maintenance team.

Cable and Cable Raceway SchedulesCable schedules give lists and specifications of all of the

cables, the equipment that each cable connects, and therouting through which the cable travels in order to reach itsdestination. It reduces field installation time and is used asmonitoring tool for installation of cables.

It is a tabulated listings that include the Cable Type, CableNumber, Cable Size, Routing (From/To), Cable Length,Voltage, and routing Tray numbers.


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Cable Raceway Schedule if provided tabulates the racewaynumber, raceway size, type of material, length, routing details,

cable numbers

Some other types of useful electrical schedules are:

Panelboard Schedule Lighting Fixture Schedule Receptacle Schedule Equipment Schedule

Motor Schedule Disconnect Switch Schedule Transformer Schedule


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4. Detail DrawingsA detail drawing also referred to as Installation Detail drawing is a

drawing of a single item or portion of an electrical system thatincorporates all of the distinct parts needed to show a workerexactly what type of material is required for an electricalinstallation.

3.7 electrical drawings r1

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