Special Occupancies and Equipment Flashcards

What is the minimum burial depth for rigid metal conduit (RMC) under a parking lot?

Answer: 12 inches

NEC Table 300.5 requires RMC to be buried at least 6 inches under a parking lot when not subject to vehicular traffic, but 24 inches in other cases—however under parking lots with vehicle traffic the minimum is 24 inches.

In an agricultural building, equipment that is subject to water and corrosive vapors must be listed for use in:

Answer: Damp or wet locations

NEC 547.5 requires electrical equipment in agricultural buildings exposed to water or corrosive vapors to be listed for damp or wet locations.

What is the required clearance between a swimming pool and an overhead service drop conductor carrying up to 750 volts?

Answer: 22.5 feet

NEC 680.8 requires a minimum horizontal clearance of 22.5 feet between a pool and overhead service conductors operating up to 750 volts.

In a Class II hazardous location, the primary hazard is from:

Answer: Combustible dust

Class II hazardous locations are defined by the presence of combustible dust that can ignite and create an explosive atmosphere.

For a temporary power installation at a construction site, GFCI protection is required for all:

Answer: 125-volt, 15- and 20-ampere receptacles

NEC 590.6 requires GFCI protection for all 125-volt, 15- and 20-ampere receptacles on construction sites.

Which NEC article covers marinas and boatyards?

Answer: Article 553

NEC Article 553 covers floating buildings, while Article 553 is actually for floating buildings—marinas and boatyards are covered by Article 553.

In an anesthetizing location of a health care facility, electrical equipment must be:

Answer: Listed for flammable anesthetizing locations

NEC 517.61 requires equipment in flammable anesthetizing locations to be specifically listed and approved for those hazardous conditions.