Electrician National Electrical Code (NEC) 3

Question 1

Per the NEC, what is the maximum length a flexible cord can be used as a substitute for fixed wiring?

Accepted Answer

Flexible cords are never permitted as fixed wiring

Answer

The NEC prohibits using flexible cords as a substitute for fixed building wiring under NEC 400.12.

Question 2

What does NEC Article 230 cover?

Accepted Answer

Services

Answer

NEC Article 230 covers all aspects of electrical service installations, including service conductors and equipment.

Question 3

According to the NEC, what minimum size copper conductor is required for a 20-ampere branch circuit?

Accepted Answer

12 AWG

Answer

The NEC requires a minimum of 12 AWG copper for a 20-ampere branch circuit per Table 310.16.

Question 4

Under the NEC, bonding of metal water piping systems is required when the piping is likely to become energized. What is this requirement found in?

Accepted Answer

Article 250

Answer

NEC Article 250 covers all grounding and bonding requirements, including bonding of metal piping systems.

Question 5

What is the minimum size service entrance conductor required for a single-family dwelling per the NEC?

Accepted Answer

4 AWG copper

Answer

NEC 230.79 requires a minimum 100-ampere service for single-family dwellings, which corresponds to 4 AWG copper for service entrance conductors.

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