CEA Wiring Methods and Materials 5

Question 1

Surface metal raceways installed in dry locations are required to be listed and may NOT be used in which location?

Accepted Answer

Hoistways

Answer

NEC 386.12 prohibits surface metal raceways in hoistways and locations subject to severe physical damage, among other restricted areas.

Question 2

When conductors are installed in parallel, each set of parallel conductors must:

Accepted Answer

Be the same length, same conductor material, same AWG, and same type of insulation

Answer

NEC 310.10(H) requires parallel conductors to be the same length, material, circular mil area, insulation type, and termination method to ensure equal current sharing.

Question 3

Conduit fill for three or more conductors in a conduit is limited to what percentage of the conduit's interior cross-sectional area?

Accepted Answer

40%

Answer

NEC Chapter 9 Table 1 limits conduit fill to 40% for three or more conductors, balancing wire-pulling ease and heat dissipation.

Question 4

What wiring method uses a factory assembly of one or more insulated conductors under an overall nonmetallic sheath, approved for direct burial?

Accepted Answer

Type UF

Answer

Type UF (Underground Feeder) cable is specifically listed for direct burial and wet locations, unlike NM-B which is for dry indoor use only.

Question 5

A grounding conductor is required in flexible metal conduit (FMC) when the FMC exceeds what length?

Accepted Answer

6 feet

Answer

NEC 348.60 permits FMC to serve as an equipment grounding conductor only when 6 feet or less in length and meeting other conditions; beyond 6 feet a separate EGC is required.

(CEA) Certified Electrical Apprentice Practice Test

(CEA) Certified Electrical Apprentice Practice Test

CEA Wiring Methods and Materials 5