Special Occupancies & Hazardous Locations Flashcards

At a motor fuel dispensing facility, the emergency shutoff device must be located how far from the fuel dispensing devices?

Answer: Not less than 20 ft nor more than 100 ft

NEC 514.11 requires emergency shutoffs 6 m (20 ft) to 30 m (100 ft) from the dispensers.

In health care facilities, a patient care space where equipment failure is likely to cause major injury or death is classified as which category?

Answer: Category 1

Category 1 (critical care) spaces are where failure is likely to cause major injury or death (517.2).

Branch circuits serving patient care spaces must include which equipment grounding arrangement per 517.13?

Answer: An insulated copper EGC plus a metal raceway or cable armor qualifying as an EGC

NEC 517.13 requires redundant grounding: a qualifying metallic wiring method plus an insulated copper equipment grounding conductor.

Article 518 applies to buildings or portions of buildings designed for the assembly of at least how many persons?

Answer: 100

Places of assembly under Article 518 are designed or intended for 100 or more persons.

In agricultural buildings, where is an equipotential plane required by Article 547?

Answer: In livestock confinement areas with concrete floors containing metallic equipment accessible to livestock

NEC 547.44 requires equipotential planes in concrete-floored livestock confinement areas with accessible metallic equipment.

In an aircraft hangar, how is any pit or depression below the hangar floor classified?

Answer: Class I, Division 1

NEC 513.3(A) classifies pits or depressions below the hangar floor as Class I, Division 1 or Zone 1.

The interior of a spray booth used for applying flammable finishes is classified as which location under Article 516?

Answer: Class I, Division 1 (or Zone 1)

NEC 516 classifies the interior of spray booths and rooms as Class I, Division 1 or Zone 1.