copyright 2008 ted "smitty" smith. left click on the presentation icon located at the...
TRANSCRIPT
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Copyright 2008 Ted "Smitty" Smith
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Left click on the presentation ICON located at the bottom of the slide directory to the left of the this slide.
Each slide will transition to the correct answer automatically in 2:00 minutes. The correct answer will transition in 10 seconds. You may also left click on the slide to manually transition.
Do not worry about writing down the correct answer for now. You will have the opportunity to do that at the end of the two minute drill
Good luck Remember to start the slide show to
activate the timer. Copyright 2005 Ted "Smitty" Smith
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This drill is a mixture of calculations and code look up questions. You have seen many of them before. Focus on time. Try to find all the answers before the slide transitions. Remember do not worry about writing down the right answer for now. When you reach the end all of the slides will be repeated without the timer so you can take your time to find the ones you missed and write down the correct answers then. Click on the slide to proceed.
Copyright 2005 Ted "Smitty" Smith
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1. Equipment grounding conductors shall be permitted to be sectioned within a listed multiconductor cable, provided the combined _______________ complies with 250.122.
A. Current and loadB. Voltages of all applied loadsC. Circular mill areaD. None of the above
Copyright 2008 Ted "Smitty" Smith
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Circular mill area
310.13
Copyright 2005 Ted "Smitty" Smith
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A conductor with insulation marked ZW will be suitable for use in all: Wet locations Hospital operating rooms House boats None of the above
Copyright 2005 Ted "Smitty" Smith
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Wet locations Table 310.13(A)
Copyright 2005 Ted "Smitty" Smith
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Where more than one calculated or ____________ ampacity could apply for a given circuit, the lowest value shall be used. Determined Tabulated Corrected Derated
Copyright 2005 Ted "Smitty" Smith
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Tabulated 310.15(A)(2)
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Where bare or covered conductors are installed with insulated conductors, the temperature rating of the bare or covered conductor shall be _____________ for the purpose of determining ampacity Equal to the lowest temperature rating of the
insulated conductors Equal to the highest temperature rating of the
insulated conductors Equal to the average temperature ratings of the
insulated conductors. None of the above
Copyright 2005 Ted "Smitty" Smith
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Equal to the lowest temperature rating of the insulated conductors
310.15(B)(3)
Copyright 2005 Ted "Smitty" Smith
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A 2 AWG TW conductor is installed in a location where the ambient temperature is expected to be 108 degrees F. The temperature correction factor for conductor ampacity in this location is _________. .96 .88 .82 .71
Copyright 2005 Ted "Smitty" Smith
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.71 Table 310.16 Bottom, 60c wire at 102
degrees F. I recommend using a straight edge
when using NEC tables. A clear plastic 6 inch ruler is best.
Copyright 2005 Ted "Smitty" Smith
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If the ambient temperature is 30 degrees C, the minimum insulation that a conductor must have and still have the capacity to carry current is __________ 60 C 105 C 90 C Any of these
Copyright 2008 Ted "Smitty" Smith
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Any of these All of these conductors are rated for 30
degrees C
Copyright 2005 Ted "Smitty" Smith
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Determine the minimum sized THHN aluminum conductor that can be installed to feed a load of 104 amperes that is located in a freezer that has an ambient temperature of 22 degrees Celsius. 1 AWG 2 AWG 3 AWG 1/0 AWG
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100 A 1/0 AWG 110.14(c) will require you handle 104
amperes in the 75 C column, so another two wire sizes will be required, therefore 1/0.
Copyright 2005 Ted "Smitty" Smith
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The ampacity of six-current carrying 10 AWG RHW aluminum conductors in a raceway in an ambient temperature of 75 degrees F is ___________› 30A› 22A› 16A› 12A
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15.75A Table 310.16 and 310.15(B)(2)(a)
Copyright 2005 Ted "Smitty" Smith
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The ampacity of nine current carrying 10 AWG THW conductors installed in a 20 inch long raceway is _________.
› 25A› 30A› 35A› None of these
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35A Bundle factors do not apply to raceways
that are 24 inches in length or less.
Copyright 2005 Ted "Smitty" Smith
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Enclosures for switches or over current devices shall not be used as junction boxes, auxiliary gutters, or raceways for conductors feeding through or tapping off to other switches or over current devices, unless adequate space for this purpose is provided. The conductors shall not fill the wiring space at any cross section to more than _______ percent of the cross-sectional area of the space.
› 20› 25› 35› 40
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40 312.8
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What is the area in square inches for a 14 AWG RHW without outer covering conductor?› 0.0209› 0.0172› 0.0252› 0.0278
Copyright 2005 Ted "Smitty" Smith
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0.0209 Table 5, Chapter 9
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What is the cross sectional area in square inches for 12 AWG RHH with outer covering conductors?
› 0.0117› 0.0353› 0.0252› 0.0327
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0.0353 Table 5, Chapter 9
Copyright 2005 Ted "Smitty" Smith
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A 200A feeder installed in Schedule 80 rigid non-metallic conduit has three 3/0 AWG THHN, one 2 AWG THHN and one 6 AWG THHN conductors. What is the minimum sized raceway required? 2 inch 2.5 inch 3 inch 3.5 inch
Copyright 2005 Ted "Smitty" Smith
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2 inch
Copyright 2005 Ted "Smitty" Smith
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What size rigid metal nipple is required for three 4/0 AWG THHN, one 1/0 AWG THHN and one 4 AWG THHN conductors? 1.5 inch 2 inch 2.5 inch None of these
Copyright 2005 Ted "Smitty" Smith
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1.5 inch 1.239 60% fill based on note 4 to Table 1
Copyright 2005 Ted "Smitty" Smith
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What size outlet box is required for one 12/2 NM cable that terminates on a switch, on 12/3 NM cable that terminates on a receptacle, and the box has manufactured internal cable clamps. › 4 x 1 1/4 square› 4 x 1 1/2 square› 4 x 2 1/8 square› None of these
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4 x 2 1/8 Square
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Machine screw type fasteners that engage not less than two and thread forming machine screws that engage not less than two threads in the enclosure may be used to mount equipment grounding bars, buses and lugs to enclosures.
› True› False
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True 250.8
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What is the net computed demand load for the air conditioning and heat for a 40 unit multifamily building that has an air conditioner ( 3hp, 3.91 kW 230V) and two baseboard heaters (3 kW) in each unit. › 160 kW› 240 kW› 6 kW› 5 kW
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240 kW Heat is larger load than A/C
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What is the demand load on the main service entrance of an apartment complex that is supplied with a 120/208V single phase service for twelve 3.25 kW ovens? 10 kW 18 kW 15 kW 20 kW
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18 kW
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What is the general lighting load for a dwelling unit with 2,700 square feet of living space not including open porches, garages, or unused or unfinished spaces not adaptable for future use?› 8100 VA› 12600 VA› 2700 VA› 6480 VA
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8100 VA
Copyright 2005 Ted "Smitty" Smith
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What is the feeder or service demand for two 3 kW ranges?› 3 kW› 4.8 kW› 4.5 kW› 3.9 kW
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4.5 kW
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If the total demand is 30 kW for a 120/240V dwelling unit, what is the minimum sized service and feeder copper conductor size allowed? 4 AWG 3/0 AWG 2 AWG 1/0 AWG
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2 AWG 30,000/240= 125A Table 310.15(B)(6) shows 2 AWG
copper for 125A services
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What is the demand on the main service entrance of a single family dwelling of a range with a nameplate rating of 13.9 kVA at 240 volts?› 8000 VA› 8800 VA› 9600 VA› 10000 VA
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8800 VA Table 220.55 Note 1
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The disconnecting means for surge protective devices shall not be considered a disconnecting means when determining the maximum number of handles for the service disconnecting means. True False
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True 230.71(A)(2)
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Metal enclosures and raceways for service conductors and equipment shall be connected to the _______________ system conductor if the electrical system is grounded or to the ________________ conductor for electrical systems that are not grounded. Grounded/ ungrounded Grounded/ grounding electrode Grounding/ grounded None of the above
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Grounded/ Grounding electrode
250.80
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Each of the slides will now be repeated.They are not timed in this segment. To change a slide, click on the side with your left mouse button. Be sure to physically look up the answers in your code book to improve your look up speed and skill.
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1. Equipment grounding conductors shall be permitted to be sectioned within a listed multiconductor cable, provided the combined _______________ complies with 250.122.
A. Current and loadB. Voltages of all applied loadsC. Circular mill areaD. None of the above
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Circular mill area
310.13
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A conductor with insulation marked ZW will be suitable for use in all: Wet locations Hospital operating rooms House boats None of the above
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Wet locations Table 310.13(A)
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Where more than one calculated or ____________ ampacity could apply for a given circuit, the lowest value shall be used. Determined Tabulated Corrected Derated
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Tabulated 310.15(A)(2)
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Where bare or covered conductors are installed with insulated conductors, the temperature rating of the bare or covered conductor shall be _____________ for the purpose of determining ampacity Equal to the lowest temperature rating of the
insulated conductors Equal to the highest temperature rating of the
insulated conductors Equal to the average temperature ratings of the
insulated conductors. None of the above
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Equal to the lowest temperature rating of the insulated conductors
310.15(B)(3)
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A 2 AWG TW conductor is installed in a location where the ambient temperature is expected to be 108 degrees F. The temperature correction factor for conductor ampacity in this location is _________. .96 .88 .82 .71
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.71 Table 310.16 Bottom, 60c wire at 102
degrees F. I recommend using a straight edge
when using NEC tables. A clear plastic 6 inch ruler is best.
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If the ambient temperature is 30 degrees C, the minimum insulation that a conductor must have and still have the capacity to carry current is __________ 60 C 105 C 90 C Any of these
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Any of these All of these conductors are rated for 30
degrees C
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Determine the minimum sized THHN aluminum conductor that can be installed to feed a load of 104 amperes that is located in a freezer that has an ambient temperature of 22 degrees Celsius. 1 AWG 2 AWG 3 AWG 1/0 AWG
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100 A 1/0 AWG 110.14(c) will require you handle 104
amperes in the 75 C column, so another two wire sizes will be required, therefore 1/0.
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The ampacity of six-current carrying 10 AWG RHW aluminum conductors in a raceway in an ambient temperature of 75 degrees F is ___________› 30A› 22A› 16A› 12A
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15.75A Table 310.16 and 310.15(B)(2)(a)
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The ampacity of nine current carrying 10 AWG THW conductors installed in a 20 inch long raceway is _________.
› 25A› 30A› 35A› None of these
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35A Bundle factors do not apply to raceways
that are 24 inches in length or less.
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Enclosures for switches or over current devices shall not be used as junction boxes, auxiliary gutters, or raceways for conductors feeding through or tapping off to other switches or over current devices, unless adequate space for this purpose is provided. The conductors shall not fill the wiring space at any cross section to more than _______ percent of the cross-sectional area of the space.
› 20› 25› 35› 40
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40 312.8
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What is the area in square inches for a 14 AWG RHW without outer covering conductor?› 0.0209› 0.0172› 0.0252› 0.0278
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0.0209 Table 5, Chapter 9
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What is the cross sectional area in square inches for 12 AWG RHH with outer covering conductors?
› 0.0117› 0.0353› 0.0252› 0.0327
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0.0353 Table 5, Chapter 9
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A 200A feeder installed in Schedule 80 rigid non-metallic conduit has three 3/0 AWG THHN, one 2 AWG THHN and one 6 AWG THHN conductors. What is the minimum sized raceway required? 2 inch 2.5 inch 3 inch 3.5 inch
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2 inch
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What size rigid metal nipple is required for three 4/0 AWG THHN, one 1/0 AWG THHN and one 4 AWG THHN conductors? 1.5 inch 2 inch 2.5 inch None of these
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1.5 inch 1.239 60% fill based on note 4 to Table 1
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What size outlet box is required for one 12/2 NM cable that terminates on a switch, on 12/3 NM cable that terminates on a receptacle, and the box has manufactured internal cable clamps. › 4 x 1 1/4 square› 4 x 1 1/2 square› 4 x 2 1/8 square› None of these
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4 x 2 1/8 Square
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Machine screw type fasteners that engage not less than two and thread forming machine screws that engage not less than two threads in the enclosure may be used to mount equipment grounding bars, buses and lugs to enclosures.
› True› False
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True 250.8
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What is the net computed demand load for the air conditioning and heat for a 40 unit multifamily building that has an air conditioner ( 3hp, 3.91 kW 230V) and two baseboard heaters (3 kW) in each unit. › 160 kW› 240 kW› 6 kW› 5 kW
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240 kW Heat is larger load than A/C
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What is the demand load on the main service entrance of an apartment complex that is supplied with a 120/208V single phase service for twelve 3.25 kW ovens? 10 kW 18 kW 15 kW 20 kW
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18 kW
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What is the general lighting load for a dwelling unit with 2,700 square feet of living space not including open porches, garages, or unused or unfinished spaces not adaptable for future use?› 8100 VA› 12600 VA› 2700 VA› 6480 VA
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8100 VA
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What is the feeder or service demand for two 3 kW ranges?› 3 kW› 4.8 kW› 4.5 kW› 3.9 kW
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4.5 kW
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If the total demand is 30 kW for a 120/240V dwelling unit, what is the minimum sized service and feeder copper conductor size allowed? 4 AWG 3/0 AWG 2 AWG 1/0 AWG
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2 AWG 30,000/240= 125A Table 310.15(B)(6) shows 2 AWG
copper for 125A services
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What is the demand on the main service entrance of a single family dwelling of a range with a nameplate rating of 13.9 kVA at 240 volts?› 8000 VA› 8800 VA› 9600 VA› 10000 VA
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8800 VA Table 220.55 Note 1
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The disconnecting means for surge protective devices shall not be considered a disconnecting means when determining the maximum number of handles for the service disconnecting means. True False
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True 230.71(A)(2)
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Metal enclosures and raceways for service conductors and equipment shall be connected to the _______________ system conductor if the electrical system is grounded or to the ________________ conductor for electrical systems that are not grounded. Grounded/ ungrounded Grounded/ grounding electrode Grounding/ grounded None of the above
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Grounded/ Grounding electrode
250.80
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