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Commercial 1 Wiring Final questions and correct answers (elaborations) with 100% accurate , verified , latest fully updated , 2024/2025 ,already passed , graded a+, complete solutions guarantee distinctions rationales| 5-star rating
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Commercial 1 Wiring Final questions and correct answers (elaborations) with 100% accurate , verified , latest fully updated , 2024/2025 ,already passed , graded a+, complete solutions guarantee distinctions rationales| 5-star rating

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  • August 5, 2024
  • 15
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • commercial 1 wiring final questions and correct an

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  • Commercial Construction
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Commercial 1 Wiring Final
- ANS-The purpose of a(n) ____ device is to protect the circuit wiring and devices and to some
extent the equipment served by the circuit.

"Identified for through-wiring" - ANS-In general, the only conductors permitted to run into or
through a fixture body or integral junction box on a recessed fixture are those supplying that
fixture. Other conductors are permitted to run through the fixture body or outlet box only when
the lighting fixture is marked "____________________".

1 to 2 - ANS-An acceptable impedance for the grounding path associated with normal
equipment grounding for branch-circuit wiring is ____ ohms.

1-1/2 in. (38 mm) from - ANS-Fluorescent fixtures mounted on low-density cellulose fiberboard
must generally be mounted ____ the fiberboard surface.

1,200 Volt amperes 600 watts - ANS-Calculate the volt-amperes and watts of a 120-volt,
10-ampere motor at 50 percent power factor.

1,920 - ANS-The maximum volt-ampere loading permitted on a 20-ampere branch circuit with a
continuous load is ____ watts (volt-amperes).

10 - ANS-For hallways of ____________________ ft. or more in length, it is required to have at
least one receptacle outlet.

100 - ANS-Branch-circuit conductors are required to have an ampacity not less than ____
percent of the load to be served.

125 - ANS-NEC® 422.13 requires that the branch circuit overcurrent device and conductors for
a storage-type electric water heater with a capacity of 120 gallons (450 L) or less must be sized
at not less than ____ percent of the rating of the water heater.

125 - ANS-Several NEC® sections contain the requirement to size conductors and overcurrent
devices at 100 percent of the noncontinuous loads plus ____ percent of the continuous loads.

125 - ANS-When sizing conductors and overcurrent protection, you must take 100 percent of
the noncontinuous loads plus ____ percent of the continuous loads.

2-wire - ANS-Some portable appliances use double insulation in place of grounding to provide
shock protection to users. Double-insulated appliances normally have ____ power cords and
attachment plug caps.

, 20 - ANS-A washer-dryer rated for 4000 VA at 208Y/120 volts single-phase must have a
branch-circuit ampacity of at least ____ amperes.

208Y - ANS-Most large commercial buildings use two voltages: 480Y/277 volts and ____/120
volts.

225 - ANS-When a branch circuit supplies an air conditioning system that consists of a hermetic
motor-compressor and other loads, the circuit rating must not exceed ____ percent of the
hermetic motor load plus the sum of the additional loads.

24 - ANS-The switches used in the low-voltage remote-control system described in this chapter
operate on ____ volts.

24 in. (600 mm) - ANS-Receptacle outlets must be installed in any wall space ____ or more in
width.

25 - ANS-A washer-dryer is rated for 4000 VA at 208Y/120 volts single-phase. The overcurrent
protective device must be rated at least ____ amperes.

3 - ANS-For system voltages of 0 to 150 volts to ground, the minimum depth of working space is
____ ft under all three working space conditions.

3 ft (900 mm); 8 ft (2.5 m) - ANS-Ceiling-suspended paddle fans must not be located within a
zone measured ____ horizontally and ____ vertically from the top of the bathtub rim or top of a
shower stall threshold.

3-phase - ANS-Water heaters are available for commercial occupancies in many sizes and
voltages, and for both single and ____ supply.

30 - ANS-NEC® 408.36(A) stipulates that if the panelboard contains snap switches with a rating
of ____ amperes or less, the panelboard overcurrent protection is not permitted to exceed 200
amperes.

35,000 - ANS-On large electrical installations, an arc flash can generate temperatures of ____
degrees F.

4 - ANS-In the water heater circuit example in this chapter, the minimum size conductor, if all
terminals are rated 75 degrees Celsius or higher, is ____ AWG as the ampacity in NEC® Table
310.16 is 85 amperes.

- ANS-The suggested fan size for rooms up to 144 square feet is
____________________ inches, and the suggested fan size for rooms up to 500 square feet is
____________________ inches.

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