NECA Electrical Systems & Equipment 3

Question 1

Which insulation type is rated for use in wet locations and direct burial?

Accepted Answer

USE-2

Answer

USE-2 (Underground Service Entrance) cable is rated for wet locations, direct burial, and use as service entrance conductors.

Question 2

A panelboard rated 42 circuits maximum currently has 40 breakers installed. How many single-pole spaces remain?

Accepted Answer

2

Answer

42 maximum minus 40 installed leaves 2 available single-pole circuit spaces.

Question 3

What type of grounding electrode is the MOST preferred by the NEC when available?

Accepted Answer

Metal underground water pipe

Answer

The NEC lists metal underground water pipe first in the grounding electrode hierarchy because it provides excellent earth contact over a large area.

Question 4

What is the minimum depth for installing rigid metal conduit (RMC) under a concrete slab that is not subject to vehicular traffic?

Accepted Answer

0 inches (none required)

Answer

RMC installed under a concrete slab with no vehicular traffic requires no minimum cover per NEC Table 300.5.

Question 5

What does a power factor of 0.8 lagging indicate about an electrical load?

Accepted Answer

The load is inductive and current lags voltage by 36.87°

Answer

A lagging power factor indicates an inductive load where current lags behind the voltage waveform.

(NECA) National Electrical Contractors Association Practice Test