chapter 3 commercial test
chapter 3 commercial test
Study online at https://quizlet.com/_4e8zi7
1. True The proper size and type of conductor must be installed to comply
with manufacturers installation instructions
2. Ampacity The maximum current, in amperes, that a conductor can carry con-
tinuously under the conditions of abuse without exceeding its tem-
perature rating.
3. 3, 86 Allowable ampacities of 310.16 (B) (16) is based on not more than
____ current-carrying conductors in a raceway, cable, or earth based
on an ambient temperature of _____ degrees F.
4. -2 Conductors with a ___ insulation designation have a higher ampacity
in a wet location than do conductors without the designation.
5. 90 degrees F Conductors with -2 designation system are rated at ____ in wet and
dry locations.
6. THWN Which of the following two insulation types are more likely to soften
when heated? THWN or XHHN.
7. 70% If nine current-carrying conductors are installed in one raceway for a
length greater than 24inches, the allowable ampacity must be reduce
to ____ .
8. 60 degrees If conduits or cables are installed on or withing 7/8 in. of a rooftop
with sunlight exposure, the following temperature must be added to
the ambient temperature for the application of the correction factor:
____ F.
9. Conductor fill, derating Spare conductors installed in a raceway are required to be counted
for _____ and ____ purposes.
10. True
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1
, chapter 3 commercial test
chapter 3 commercial test
Study online at https://quizlet.com/_4e8zi7
The neutral conductor of a 2-wire circuit from a 3-phase, 4-wire
system is required to be counted as as a current-carrying conductor
in a raceway or cable.
11. False If a conductor is installed so not more than 50% is in a cooler area and
50% is in a hotter ambient temperature, the ampacity determined in
the cooler are can be used for the entire run.
12. True The neutral conductor of a 3-wire circuit from a 3-phase, 4-wire
system is required to be counted as a current-carrying conductor in
a raceway or cable.
13. False The neutral conductor of a 3-wire circuit from a 1-phase, 3-wire
system is required to be counted as a current-carrying conductor in
a raceway or cable.
14. Continuous A ___ load is any load that is on for 3 hours or more.
15. 125% Overcurrent protection for continuous loads must be sized at no less
than ____ of the load.
16. Is not Compensation for voltage drop ___ generally required by the NEC.
17. H=IxI(t) Heat generated in a conductor over a short period of time is ____.,
expressed in ampere-square seconds.
18. W=IxI(R) Heat generated in a conductor over a long period of time is ____,
expressed in watts.
19. Type XHHW ____ is 90 degrees C in dry, 75 in wet.
20. 1/0 AWG The minimum size conductor to be run in parallel is ____.
21. 310.106(D) The article for all conductors to be insulated ____.
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chapter 3 commercial test
Study online at https://quizlet.com/_4e8zi7
1. True The proper size and type of conductor must be installed to comply
with manufacturers installation instructions
2. Ampacity The maximum current, in amperes, that a conductor can carry con-
tinuously under the conditions of abuse without exceeding its tem-
perature rating.
3. 3, 86 Allowable ampacities of 310.16 (B) (16) is based on not more than
____ current-carrying conductors in a raceway, cable, or earth based
on an ambient temperature of _____ degrees F.
4. -2 Conductors with a ___ insulation designation have a higher ampacity
in a wet location than do conductors without the designation.
5. 90 degrees F Conductors with -2 designation system are rated at ____ in wet and
dry locations.
6. THWN Which of the following two insulation types are more likely to soften
when heated? THWN or XHHN.
7. 70% If nine current-carrying conductors are installed in one raceway for a
length greater than 24inches, the allowable ampacity must be reduce
to ____ .
8. 60 degrees If conduits or cables are installed on or withing 7/8 in. of a rooftop
with sunlight exposure, the following temperature must be added to
the ambient temperature for the application of the correction factor:
____ F.
9. Conductor fill, derating Spare conductors installed in a raceway are required to be counted
for _____ and ____ purposes.
10. True
1/5
1
, chapter 3 commercial test
chapter 3 commercial test
Study online at https://quizlet.com/_4e8zi7
The neutral conductor of a 2-wire circuit from a 3-phase, 4-wire
system is required to be counted as as a current-carrying conductor
in a raceway or cable.
11. False If a conductor is installed so not more than 50% is in a cooler area and
50% is in a hotter ambient temperature, the ampacity determined in
the cooler are can be used for the entire run.
12. True The neutral conductor of a 3-wire circuit from a 3-phase, 4-wire
system is required to be counted as a current-carrying conductor in
a raceway or cable.
13. False The neutral conductor of a 3-wire circuit from a 1-phase, 3-wire
system is required to be counted as a current-carrying conductor in
a raceway or cable.
14. Continuous A ___ load is any load that is on for 3 hours or more.
15. 125% Overcurrent protection for continuous loads must be sized at no less
than ____ of the load.
16. Is not Compensation for voltage drop ___ generally required by the NEC.
17. H=IxI(t) Heat generated in a conductor over a short period of time is ____.,
expressed in ampere-square seconds.
18. W=IxI(R) Heat generated in a conductor over a long period of time is ____,
expressed in watts.
19. Type XHHW ____ is 90 degrees C in dry, 75 in wet.
20. 1/0 AWG The minimum size conductor to be run in parallel is ____.
21. 310.106(D) The article for all conductors to be insulated ____.
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