CEA - Certified Electrical Apprentice NEC Wiring and Protection Questions and Answers

Question 1

According to NEC Table 310.16, what is the allowable ampacity for a 10 AWG THWN copper conductor in a raceway with not more than three current-carrying conductors in an ambient temperature of 30°C?

Accepted Answer

35A

Answer

30A

Answer

40A

Answer

25A

Question 2

An apprentice is installing a 120V, 12A non-continuous, non-motor operated appliance that does not have an overcurrent protection rating marked on it. What is the maximum standard size overcurrent device that can be used for the branch circuit supplying only this appliance?

Accepted Answer

20A

Answer

15A

Answer

25A

Answer

30A

Question 3

Which of the following locations in a dwelling unit requires GFCI protection for all 125-volt through 250-volt receptacles supplied by single-phase branch circuits rated 150 volts or less to ground?

Accepted Answer

Garages

Answer

Hallways

Answer

Bedrooms

Answer

Closets

Question 4

To provide an effective ground-fault current path, metal parts of electrical raceways, enclosures, and equipment must be connected to establish electrical continuity and conductivity. What is this connection called?

Accepted Answer

Bonding

Answer

Grounding

Answer

Isolating

Answer

Insulating

Question 5

An electrician is wiring an outdoor receptacle on the exterior of a commercial building. The area is exposed to rain. Which of the following wiring methods and materials is most appropriate for this wet location?

Accepted Answer

Type XHHW conductors in Rigid Metal Conduit (RMC) with weatherproof fittings

Answer

Type NM cable in a standard PVC box

Answer

Type THHN conductors in EMT with standard set-screw fittings

Answer

Type MC cable with standard connectors

Question 6

When calculating the load for a branch circuit that supplies a continuous load, the circuit conductors must have an ampacity not less than what percentage of the continuous load, plus 100% of any noncontinuous load?

Accepted Answer

125%

Answer

80%

Answer

100%

Answer

150%