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Practice code look up

Practice Code Look Up

Two Minute Drill #15

Copyright 2008 Ted "Smitty" Smith


Directions
Directions

  • 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


Further more
Further More

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


Conductors
Conductors

  • Equipment grounding conductors shall be permitted to be sectioned within a listed multiconductor cable, provided the combined _______________ complies with 250.122.

    • Current and load

    • Voltages of all applied loads

    • Circular mill area

    • None of the above

Copyright 2008 Ted "Smitty" Smith


Conductors1
Conductors

  • Circular mill area

  • 310.13

Copyright 2005 Ted "Smitty" Smith


Conductors2
Conductors

  • 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


Conductors3
Conductors

  • Wet locations

  • Table 310.13(A)

Copyright 2005 Ted "Smitty" Smith


Conductors4
Conductors

  • 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


Conductors5
Conductors

  • Tabulated 310.15(A)(2)

Copyright 2005 Ted "Smitty" Smith


Conductors6
Conductors

  • 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


Conductors7
Conductors

  • Equal to the lowest temperature rating of the insulated conductors

  • 310.15(B)(3)

  • Copyright 2005 Ted "Smitty" Smith


    Conductors8
    Conductors

    • 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


    Conductors9
    Conductors

    • .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


    Conductors10
    Conductors

    • 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


    Conductors11
    Conductors

    • Any of these

    • All of these conductors are rated for 30 degrees C

    Copyright 2005 Ted "Smitty" Smith


    Conductors12
    Conductors

    • 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

    Copyright 2008 Ted "Smitty" Smith


    Conductors13
    Conductors

    • 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


    Conductors14
    Conductors

    • 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

    Copyright 2005 Ted "Smitty" Smith


    Conductors15
    Conductors

    • 15.75A

    • Table 310.16 and 310.15(B)(2)(a)

    Copyright 2005 Ted "Smitty" Smith


    Conductors16
    Conductors

    • The ampacity of nine current carrying 10 AWG THW conductors installed in a 20 inch long raceway is _________.

      • 25A

      • 30A

      • 35A

      • None of these

    Copyright 2005 Ted "Smitty" Smith


    Conductors17
    Conductors

    • 35A

    • Bundle factors do not apply to raceways that are 24 inches in length or less.

    Copyright 2005 Ted "Smitty" Smith


    Raceway
    Raceway

    • 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

    Copyright 2005 Ted "Smitty" Smith


    Raceway1
    Raceway

    • 40

    • 312.8

    Copyright 2005 Ted "Smitty" Smith


    Raceway2
    Raceway

    • 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


    Raceways
    Raceways

    • 0.0209

    • Table 5, Chapter 9

    Copyright 2005 Ted "Smitty" Smith


    Raceways1
    Raceways

    • 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

    Copyright 2005 Ted "Smitty" Smith


    Raceways2
    Raceways

    • 0.0353

    • Table 5, Chapter 9

    Copyright 2005 Ted "Smitty" Smith


    Raceways3
    Raceways

    • 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


    Raceways4
    Raceways

    • 2 inch

    Copyright 2005 Ted "Smitty" Smith


    Raceway3
    Raceway

    • 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


    Raceway4
    Raceway

    • 1.5 inch

    • 1.239

    • 60% fill based on note 4 to Table 1

    Copyright 2005 Ted "Smitty" Smith


    Raceways5
    Raceways

    • 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

    Copyright 2005 Ted "Smitty" Smith


    Raceways6
    Raceways

    • 4 x 2 1/8 Square

    Copyright 2005 Ted "Smitty" Smith


    Grounding
    Grounding

    • 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

    Copyright 2005 Ted "Smitty" Smith


    Grounding1
    Grounding

    • True

    • 250.8

    Copyright 2005 Ted "Smitty" Smith


    Calculations
    Calculations

    • 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

    Copyright 2005 Ted "Smitty" Smith


    Calculations1
    Calculations

    • 240 kW

    • Heat is larger load than A/C

    Copyright 2005 Ted "Smitty" Smith


    Calculations2
    Calculations

    • 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

    Copyright 2005 Ted "Smitty" Smith


    Calculations3
    Calculations

    • 18 kW

    Copyright 2005 Ted "Smitty" Smith


    Calculations4
    Calculations

    • 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

    Copyright 2005 Ted "Smitty" Smith


    Calculations5
    Calculations

    • 8100 VA

    Copyright 2005 Ted "Smitty" Smith


    Calculations6
    Calculations

    • What is the feeder or service demand for two 3 kW ranges?

      • 3 kW

      • 4.8 kW

      • 4.5 kW

      • 3.9 kW

    Copyright 2005 Ted "Smitty" Smith


    Calculations7
    Calculations

    • 4.5 kW

    Copyright 2005 Ted "Smitty" Smith


    Calculations8
    Calculations

    • 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

    Copyright 2005 Ted "Smitty" Smith


    Calculations9
    Calculations

    • 2 AWG

    • 30,000/240= 125A

    • Table 310.15(B)(6) shows 2 AWG copper for 125A services

    Copyright 2005 Ted "Smitty" Smith


    Calculations10
    Calculations

    • 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

    Copyright 2005 Ted "Smitty" Smith


    Calculations11
    Calculations

    • 8800 VA   Table 220.55 Note 1

    Copyright 2005 Ted "Smitty" Smith


    Services
    Services

    • 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

    Copyright 2005 Ted "Smitty" Smith


    Services1
    Services

    • True

    • 230.71(A)(2)

    Copyright 2005 Ted "Smitty" Smith


    Grounding2
    Grounding

    • 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

    Copyright 2005 Ted "Smitty" Smith


    Grounding3
    Grounding

    • Grounded/ Grounding electrode              

    • 250.80

    Copyright 2005 Ted "Smitty" Smith


    The end
    The End

    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.

    Copyright 2005 Ted "Smitty" Smith


    Conductors18
    Conductors

    • Equipment grounding conductors shall be permitted to be sectioned within a listed multiconductor cable, provided the combined _______________ complies with 250.122.

      • Current and load

      • Voltages of all applied loads

      • Circular mill area

      • None of the above

    Copyright 2008 Ted "Smitty" Smith


    Conductors19
    Conductors

    • Circular mill area

    • 310.13

    Copyright 2005 Ted "Smitty" Smith


    Conductors20
    Conductors

    • 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


    Conductors21
    Conductors

    • Wet locations

    • Table 310.13(A)

    Copyright 2005 Ted "Smitty" Smith


    Conductors22
    Conductors

    • 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


    Conductors23
    Conductors

    • Tabulated 310.15(A)(2)

    Copyright 2005 Ted "Smitty" Smith


    Conductors24
    Conductors

    • 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


    Conductors25
    Conductors

    • Equal to the lowest temperature rating of the insulated conductors

  • 310.15(B)(3)

  • Copyright 2005 Ted "Smitty" Smith


    Conductors26
    Conductors

    • 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


    Conductors27
    Conductors

    • .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


    Conductors28
    Conductors

    • 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


    Conductors29
    Conductors

    • Any of these

    • All of these conductors are rated for 30 degrees C

    Copyright 2005 Ted "Smitty" Smith


    Conductors30
    Conductors

    • 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

    Copyright 2008 Ted "Smitty" Smith


    Conductors31
    Conductors

    • 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


    Conductors32
    Conductors

    • 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

    Copyright 2005 Ted "Smitty" Smith


    Conductors33
    Conductors

    • 15.75A

    • Table 310.16 and 310.15(B)(2)(a)

    Copyright 2005 Ted "Smitty" Smith


    Conductors34
    Conductors

    • The ampacity of nine current carrying 10 AWG THW conductors installed in a 20 inch long raceway is _________.

      • 25A

      • 30A

      • 35A

      • None of these

    Copyright 2005 Ted "Smitty" Smith


    Conductors35
    Conductors

    • 35A

    • Bundle factors do not apply to raceways that are 24 inches in length or less.

    Copyright 2005 Ted "Smitty" Smith


    Raceway5
    Raceway

    • 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

    Copyright 2005 Ted "Smitty" Smith


    Raceway6
    Raceway

    • 40

    • 312.8

    Copyright 2005 Ted "Smitty" Smith


    Raceway7
    Raceway

    • 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


    Raceways7
    Raceways

    • 0.0209

    • Table 5, Chapter 9

    Copyright 2005 Ted "Smitty" Smith


    Raceways8
    Raceways

    • 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

    Copyright 2005 Ted "Smitty" Smith


    Raceways9
    Raceways

    • 0.0353

    • Table 5, Chapter 9

    Copyright 2005 Ted "Smitty" Smith


    Raceways10
    Raceways

    • 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


    Raceways11
    Raceways

    • 2 inch

    Copyright 2005 Ted "Smitty" Smith


    Raceway8
    Raceway

    • 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


    Raceway9
    Raceway

    • 1.5 inch

    • 1.239

    • 60% fill based on note 4 to Table 1

    Copyright 2005 Ted "Smitty" Smith


    Raceways12
    Raceways

    • 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

    Copyright 2005 Ted "Smitty" Smith


    Raceways13
    Raceways

    • 4 x 2 1/8 Square

    Copyright 2005 Ted "Smitty" Smith


    Grounding4
    Grounding

    • 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

    Copyright 2005 Ted "Smitty" Smith


    Grounding5
    Grounding

    • True

    • 250.8

    Copyright 2005 Ted "Smitty" Smith


    Calculations12
    Calculations

    • 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

    Copyright 2005 Ted "Smitty" Smith


    Calculations13
    Calculations

    • 240 kW

    • Heat is larger load than A/C

    Copyright 2005 Ted "Smitty" Smith


    Calculations14
    Calculations

    • 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

    Copyright 2005 Ted "Smitty" Smith


    Calculations15
    Calculations

    • 18 kW

    Copyright 2005 Ted "Smitty" Smith


    Calculations16
    Calculations

    • 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

    Copyright 2005 Ted "Smitty" Smith


    Calculations17
    Calculations

    • 8100 VA

    Copyright 2005 Ted "Smitty" Smith


    Calculations18
    Calculations

    • What is the feeder or service demand for two 3 kW ranges?

      • 3 kW

      • 4.8 kW

      • 4.5 kW

      • 3.9 kW

    Copyright 2005 Ted "Smitty" Smith


    Calculations19
    Calculations

    • 4.5 kW

    Copyright 2005 Ted "Smitty" Smith


    Calculations20
    Calculations

    • 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

    Copyright 2005 Ted "Smitty" Smith


    Calculations21
    Calculations

    • 2 AWG

    • 30,000/240= 125A

    • Table 310.15(B)(6) shows 2 AWG copper for 125A services

    Copyright 2005 Ted "Smitty" Smith


    Calculations22
    Calculations

    • 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

    Copyright 2005 Ted "Smitty" Smith


    Calculations23
    Calculations

    • 8800 VA   Table 220.55 Note 1

    Copyright 2005 Ted "Smitty" Smith


    Services2
    Services

    • 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

    Copyright 2005 Ted "Smitty" Smith


    Services3
    Services

    • True

    • 230.71(A)(2)

    Copyright 2005 Ted "Smitty" Smith


    Grounding6
    Grounding

    • 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

    Copyright 2005 Ted "Smitty" Smith


    Grounding7
    Grounding

    • Grounded/ Grounding electrode              

    • 250.80

    Copyright 2005 Ted "Smitty" Smith


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