ECS Electrical Wiring and Cable Installation

Question 1

What does the term 'volt-drop' refer to in an electrical installation?

Accepted Answer

The reduction in voltage along a cable due to its resistance

Answer

The total voltage supplied to a circuit

Answer

The voltage rating printed on a cable jacket

Answer

The drop in voltage when a circuit breaker trips

Question 2

Which conductor color represents the live (line) wire in a standard US electrical installation?

Accepted Answer

Black or red

Answer

Black

Answer

White

Answer

Green

Question 3

What is the primary purpose of installing cables inside conduit?

Accepted Answer

To protect cables from mechanical damage and allow future replacement

Answer

To increase the current-carrying capacity of conductors

Answer

To reduce the resistance of the conductors

Answer

To eliminate the need for circuit breakers

Question 4

When cables must pass through a fire-rated wall, what is required?

Accepted Answer

A fire-stopping compound or sleeve must be used to seal the penetration

Answer

The cables must be rated at least 600V

Answer

The cables must be enclosed in metallic conduit only

Answer

No special treatment is needed if cables are insulated

Question 5

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

Accepted Answer

American Wire Gauge

Answer

Armored Wire Gauge

Answer

Alternating Waveform Grade

Answer

Approved Wiring Guide

Question 6

What is the maximum ampacity of a 14 AWG copper conductor under standard residential wiring conditions?

Accepted Answer

15 amps

Answer

10 amps

Answer

20 amps

Answer

30 amps