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North Carolina electrician licensing guide: NEC code practice

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Trade licensing exams commonly test code application. Electrical preparation centers on the National Electrical Code (NEC). The code edition adopted by the state or local authority and the edition tested may differ from this bank’s references (NEC 2023). Local amendments can also matter.

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Try three code-based questions.

1 / General requirements

A listed panelboard is supplied with a torque value for its terminals. Which installation practice satisfies the terminal tightening requirement?

  1. Use an approved means to achieve the indicated terminal torque
  2. Use a torque value selected only from conductor ampacity
  3. Apply the same torque used for the breaker handle
  4. Tighten until the conductor insulation deforms
Show answer & explanation

Use an approved means to achieve the indicated terminal torque

Achieve the tightening torque indicated on the equipment or in its installation instructions using an approved means. A calibrated torque tool is one such means; follow any applicable manufacturer instructions.

NEC 2023 110.14(D)

2 / Wiring methods

Several conductors of the same AC circuit pass through a steel enclosure. How should they generally be arranged?

  1. Together through the same opening
  2. Each phase through a separate isolated steel hole
  3. The equipment ground outside the raceway in all cases
  4. Only the neutral through the largest hole
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Together through the same opening

Grouping all circuit conductors prevents inductive heating in ferrous metal. Separate openings require specific permitted arrangements.

NEC 2023 300.20(A)

3 / Wiring methods

Internal cable clamps occupy a box. What is their general box-fill treatment?

  1. Two volumes for each cable entering
  2. No allowance for any internal clamp
  3. One conductor volume based on the largest conductor present
  4. One volume for every individual clamp screw
Show answer & explanation

One conductor volume based on the largest conductor present

One or more internal cable clamps together count as one conductor volume based on the largest conductor present.

NEC 2023 314.16(B)(2)

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