Journeyman Electrician’s Exam Journeyman Electrician's General 2

Question 1

What is the maximum length of a flexible cord used as a substitute for fixed wiring in a dwelling unit?

Accepted Answer

Flexible cord cannot be used as a substitute for fixed wiring

Answer

Per NEC 400.12, flexible cords and cables shall not be used as a substitute for the fixed wiring of a structure.

Question 2

According to the NEC, what is the minimum burial depth for a 120V residential branch circuit installed in a rigid metal conduit (RMC)?

Accepted Answer

6 inches

Answer

NEC Table 300.5 specifies a minimum cover of 6 inches for rigid metal conduit regardless of voltage for residential branch circuits.

Question 3

A 240V, single-phase motor draws 18 amps at full load. What is the minimum rating of the branch circuit conductors?

Accepted Answer

22.5 amps

Answer

NEC 430.22 requires branch circuit conductors for a single motor to have an ampacity of not less than 125% of the motor FLC: 18 × 1.25 = 22.5 amps.

Question 4

Which of the following is the correct color for a grounded (neutral) conductor in a 277/480V, 3-phase, 4-wire wye system?

Accepted Answer

Either white or gray

Answer

NEC 200.6 permits white or gray insulation to identify the grounded conductor, and either is acceptable for any voltage system.

Question 5

What device is required by the NEC when a grounding electrode conductor is spliced?

Accepted Answer

Listed irreversible compression connector or exothermic weld

Answer

NEC 250.64(C) requires grounding electrode conductor splices to be made with irreversible compression connectors or by exothermic welding.

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