Quiz on the Code - Commercial Garages, Repair & Storage Wiring
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1. If a major repair garage where Class I liquids or gaseous fuels heavier than air are transferred or dispensed has a 1,550 CFM exhaust fan mounted through the wall at 6’ above the floor in an area that is 30’ x 40’ (1,200 ft²). The area is a _______up to 18” above the floor.
(a) Class 1 Division 2
(b) Class 1 Division 1
(c) Unclassified
(d) Class 1 Zone 1
2. Areas adjacent to classified locations where flammable vapors are not likely to be released, such as stock rooms, switchboard rooms, and other similar locations, where mechanically ventilated at a rate of four or more air changes per hour, designed with positive air pressure, or separated by an unpierced wall, roof, or other solid partition are classified as _______?
(a) Class 1 Division 2
(b) Class 1 Division 1
(c) Unclassified
(d ) Class 1 Zone 1
3. For wiring in spaces above hazardous classified locations, pendants, flexible cords shall be suitable for the type of service and _______.
(a) be supported with a strain relief cable fitting
(b) be listed for hazardous locations
(c) be of a 12AWG copper or larger
(d) shall be listed for hard
4. Which of the following conditions must be met for portable lighting equipment to be compliant in hazardous locations as described in NEC 511.5?
(a) The lampholder must be switched and allow plug-in attachment plugs for flexibility in use.
(b) The outer shell must be metallic and grounded to ensure conductivity.
(c) The lamp and cord must either be supported to prevent use in Class I, Division 1 locations or be of a type identified for such hazardous locations.
(d) The equipment must include a detachable guard and hook for convenience in temporary installations.
5. When considering wiring and equipment in a Class I location and where the cord is suspended from an overhead source for an EV, it shall be arranged so that the lowest point of sag is at least _______ above the floor.
(a) 6"
(b) 12"
(c) 18"
(d) 24”
Key
1. (a) Table 511.3(C)
2. (c) 511.3(E)(1)
3. (d) 511.7(A)(2
4. (c) 511.4(B)(2)
5. (a) 511.10(B)(3)
