Journeyman Electrician’s Exam Journeyman Electrician's 2

Question 1

According to the NEC, what is the maximum number of current-carrying conductors allowed in a conduit before derating is required?

Accepted Answer

3

Answer

The NEC allows up to 3 current-carrying conductors in a conduit without derating; more than 3 requires applying adjustment factors per Table 310.15(C)(1).

Question 2

A 20-ampere branch circuit receptacle outlet in a bathroom must be protected by which of the following?

Accepted Answer

GFCI

Answer

NEC 210.8 requires GFCI protection for all 125-volt, single-phase, 15- and 20-ampere receptacles in bathrooms.

Question 3

What is the minimum burial depth for a rigid metal conduit (RMC) under a residential driveway?

Accepted Answer

12 inches

Answer

NEC Table 300.5 requires RMC to be buried at least 6 inches under a residential driveway, but under a concrete slab (like a driveway) it is 6 inches; under regular driveways it's 12 inches for RMC.

Question 4

Which conductor color is reserved exclusively for ungrounded (hot) conductors in a 3-phase, 4-wire delta system with a high leg?

Accepted Answer

Orange

Answer

NEC 230.56 and 408.3(F) require the high-leg conductor (which has a higher voltage to ground) to be identified with orange tape or insulation.

Question 5

What is the ampacity of a 10 AWG copper THHN conductor in free air at 60°C ambient?

Accepted Answer

55 amps

Answer

Per NEC Table 310.15(B)(17), a 10 AWG THHN copper conductor in free air at 60°C has an ampacity of 55 amperes.

Journeyman Electrician’s Exam Practice Test

Journeyman Electrician’s Exam Practice Test

Journeyman Electrician’s Exam Journeyman Electrician's 2