NEC Special Occupancies & Equipment 3

Question 1

NEC Article 503 covers Class III locations. What makes a location Class III?

Accepted Answer

Presence of easily ignitable fibers or flyings

Answer

Class III locations are hazardous because of the presence of easily ignitable fibers or flyings, such as those found in textile mills.

Question 2

What NEC article governs electrical installations in theaters, audience areas of motion picture studios, and similar locations?

Accepted Answer

Article 520

Answer

NEC Article 520 covers electrical wiring and equipment installed in or about theaters, audience areas of motion picture studios, and similar locations.

Question 3

For swimming pools under NEC Article 680, what is the minimum required distance for overhead conductors (other than service drops) to clear the water's edge horizontally?

Accepted Answer

15 feet

Answer

NEC 680.8 requires overhead conductors (other than service drops) to maintain a minimum 15-foot horizontal clearance from the edge of a swimming pool.

Question 4

Under NEC Article 680, luminaires installed in the wall of a permanently installed swimming pool must be at least how far below the normal water level?

Accepted Answer

12 inches

Answer

NEC 680.22(B)(1) requires that luminaires installed in the walls of permanently installed pools be at least 18 inches below the normal water level.

Question 5

NEC Article 525 addresses carnivals, circuses, and fairs. What type of wiring method is prohibited for use as a flexible connection between equipment and supply in these temporary installations?

Accepted Answer

Extension cords used as permanent wiring

Answer

Extension cords must not be used as permanent or long-term wiring at carnivals, circuses, and fairs; listed flexible cords and cables suitable for hard or extra-hard usage are required.

NEC Practice Test

NEC Practice Test

NEC Special Occupancies & Equipment 3