Special Occupancies and Equipment Flashcards

A receptacle installed within 6 feet of a hydromassage bathtub must be protected by:

Answer: GFCI protection

NEC 680.74 requires all receptacles within 6 feet of a hydromassage bathtub to be GFCI protected.

What is the maximum voltage permitted for underwater pool lighting in a wet-niche fixture?

Answer: 30 volts

NEC 680.23(A)(4) permits wet-niche luminaires to operate at no more than 150 volts between conductors, but the practical limit for underwater fixtures is 30 volts.

In a Class I, Division 2 location, which of the following is NOT required to be explosion-proof?

Answer: General-purpose motors that won't arc normally

In Division 2 locations, motors that are not normally arcing and are totally enclosed may be used without explosion-proof listing, unlike Division 1.

Mobile home parks must provide each lot with at least a minimum electrical service of:

Answer: 50-ampere, 120/240-volt

NEC 550.30 requires each mobile home lot to be supplied with a minimum 50-ampere, 120/240-volt service.

For a grain storage elevator, the area within 3 feet of any opening in a belt or bucket elevator housing is classified as:

Answer: Class II, Division 1

NEC 511.3 Table defines the area within 3 feet of openings in grain elevator housings as Class II, Division 1 due to constant grain dust presence.

Which wiring method is specifically prohibited in theaters for use above the stage?

Answer: Type NM cable

NEC 520.5 prohibits Type NM (nonmetallic-sheathed) cable above stages in theaters due to the fire hazard from scenery and equipment.

Shore power receptacles at a marina must be located within how many feet of the boat slip they serve?

Answer: 20 feet

NEC 553.11 requires shore power receptacles to be located within 20 feet of the bow or stern of the boat slip they serve.