PC Special Occupancies and Equipment 3 — Questions and Answers
Question 1: In a theater or similar occupancy covered by NEC Article 520, portable stage switchboards must be protected by overcurrent devices not exceeding what percentage of the switchboard's ampere rating?
- 100%
- 125% (Correct answer)
- 150%
- 200%
Correct answer: 125%
NEC 520.25 requires overcurrent protection for portable stage switchboards not exceeding 125% of the switchboard ampere rating.
Question 2: According to NEC Article 525, temporary wiring for carnivals and fairs must use what minimum conductor size for branch circuits?
- 14 AWG
- 12 AWG (Correct answer)
- 10 AWG
- 8 AWG
Correct answer: 12 AWG
NEC 525.20(E) requires all branch circuit conductors for carnivals and fairs to be not smaller than 12 AWG.
Question 3: Under NEC Article 690 for solar photovoltaic systems, what is the maximum voltage permitted for a PV system installed on or in a one- or two-family dwelling?
- 300 volts
- 480 volts
- 600 volts (Correct answer)
- 1000 volts
Correct answer: 600 volts
NEC 690.7(A) limits PV system maximum voltage to 600 volts for systems on or in one- and two-family dwellings.
Question 4: For electric vehicle charging stations covered by NEC Article 625, EVSE (Electric Vehicle Supply Equipment) installed outdoors must be listed for what environment?
- Weatherproof only
- Wet locations (Correct answer)
- Damp locations only
- Dry locations with weatherproof covers
Correct answer: Wet locations
NEC 625.22 requires that outdoor EVSE be listed and identified for wet locations.
Question 5: NEC Article 700 covers emergency systems. These systems must be tested under load within how many hours after installation and at least every how often thereafter?
- 12 hours after installation; every 6 months
- 30 days after installation; every 12 months
- 24 hours after installation; every 6 months (Correct answer)
- 72 hours after installation; annually
Correct answer: 24 hours after installation; every 6 months
NEC 700.3(B) requires emergency systems to be tested within 24 hours of installation and at intervals not exceeding 6 months.
Question 6: In a health care facility critical branch, NEC 517.33 requires that the critical branch be transferred to alternate power within what maximum time after normal power failure?
- 30 seconds
- 20 seconds
- 10 seconds (Correct answer)
- 60 seconds
Correct answer: 10 seconds
NEC 517.33 requires the critical branch of a healthcare facility to be automatically transferred to alternate power within 10 seconds of normal power loss.
Question 7: Per NEC Article 680, which type of luminaire is permitted to be installed less than 5 feet from the inside walls of an outdoor pool?
- Listed 150-watt incandescent luminaire
- Listed low-voltage luminaire operated at 15 volts or less (Correct answer)
- Any luminaire with GFCI protection
- Listed LED luminaire rated for wet locations
Correct answer: Listed low-voltage luminaire operated at 15 volts or less
NEC 680.22(B)(3) permits low-voltage luminaires operating at 15 volts or less within 5 feet of a pool if installed per manufacturer instructions.
PC Special Occupancies and Equipment 3
In a theater or similar occupancy covered by NEC Article 520, portable stage switchboards must be protected by overcurrent devices not exceeding what percentage of the switchboard's ampere rating?