CEA Wiring Methods and Materials Questions and Answers

Question 1

According to the NEC, what is the required color code for the insulation of a grounded conductor (neutral) in a 120/240V system for conductors size 6 AWG or smaller?

Accepted Answer

White or gray.

Answer

Green or green with a yellow stripe.

Answer

Black, red, or blue.

Answer

Any color other than white, gray, or green.

Question 2

An apprentice is installing a run of 1/2-inch Electrical Metallic Tubing (EMT) on a long, straight wall. According to the NEC, what is the maximum distance allowed between supports for this EMT run?

Accepted Answer

10 feet

Answer

5 feet

Answer

8 feet

Answer

12 feet

Question 3

An apprentice needs to select a cable for a residential branch circuit that will be run concealed within a dry, interior wall. Which of the following cable types is most commonly used and permitted for this application?

Accepted Answer

Type NM (Nonmetallic-Sheathed Cable)

Answer

Type UF (Underground Feeder)

Answer

Type SE (Service-Entrance Cable)

Answer

Type TC (Tray Cable)

Question 4

An apprentice is laying out receptacle outlets for the living room of a new single-family dwelling. According to the NEC general provisions for receptacle placement along walls, no point measured horizontally along the floor line in any wall space should be more than how far from a receptacle outlet?

Accepted Answer

6 feet

Answer

12 feet

Answer

4 feet

Answer

10 feet

Question 5

What is the primary purpose of the main bonding jumper in a service panel?

Accepted Answer

To provide a connection between the grounded service conductor (neutral) and the equipment grounding conductor(s).

Answer

To connect two separate service panels together.

Answer

To isolate the neutral bar from the panel enclosure.

Answer

To connect the circuit breaker's trip unit to the busbar.

Question 6

When installing Type NM cable in a new residential construction, which of the following is an NEC-compliant method for securing the cable?

Accepted Answer

Within 12 inches of a single-gang nonmetallic box and every 4.5 feet thereafter.

Answer

Draping the cable over ceiling joists without any fasteners.

Answer

Taping the cable directly to a water pipe.

Answer

Within 6 inches of the panelboard cabinet and secured with a zip tie.