NCCER Electrical 2

Question 1

In standard US 120V residential wiring, which wire is the ungrounded (hot) conductor?

Accepted Answer

Black wire

Answer

The black wire is the ungrounded (hot) conductor in standard US residential wiring, carrying current from the panel to the load.

Question 2

What is the maximum conduit fill percentage allowed by the NEC when three or more conductors are installed?

Accepted Answer

40%

Answer

The NEC limits conduit fill to 40% when three or more conductors are installed to prevent heat buildup and conductor damage.

Question 3

Which type of conduit is approved for outdoor use, wet locations, and direct burial?

Accepted Answer

Rigid Metal Conduit (RMC)

Answer

Rigid Metal Conduit (RMC) is the most durable conduit type and is approved for outdoor, wet, and direct burial applications.

Question 4

In a standard 240V residential circuit, what color is typically used for the second hot conductor?

Accepted Answer

Red

Answer

In a 240V circuit, the second ungrounded (hot) conductor is typically red, while the first hot conductor is black.

Question 5

What does AWG stand for in the context of electrical wire sizing?

Accepted Answer

American Wire Gauge

Answer

AWG stands for American Wire Gauge, the standard US system for specifying wire diameter where smaller numbers indicate larger wire sizes.

NCCER (National Center for Construction Education & Research) Practice Test