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Practice Code Look Up. Two Minute Drill #15. Directions. Left click on the presentation ICON located at the bottom of the slide directory to the left of the this slide.

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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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