Code Rule
680.12: Maintenance disconnecting means.
Key Rules and Sections
Code Rule
680.21: Motors.
Code Rule
680.22: Receptacles.
Code Rule
680.23: Luminaires.
Code Rule
680.26: Equipotential bonding.
Code Rule
680.44: GFCI protection for spas.
Sample Questions With Answers
Question 1
According to NEC 2020, combination AFCI/GFCI devices are permitted to be used in which locations?
Correct Answer: Any location requiring both protections
Why: NEC 210.12(A)(6) allows combination AFCI/GFCI devices wherever both arc-fault and ground-fault protection are required
Question 2
Under NEC 2020, what is the maximum interval allowed between GFCI testing?
Correct Answer: 30 days
Why: NEC 210.8 recommends testing GFCI devices monthly, which is 30 days maximum interval
Question 3
Per NEC 2020 Article 250, equipment grounding conductor connections at GFCI devices must be made using:
Correct Answer: Listed connectors
Why: NEC 250.8 requires equipment grounding conductor connections to use listed connectors
Question 4
According to NEC 2020, GFCI protection is required for temporary wiring installations exceeding:
Correct Answer: 90 days
Why: NEC 590.6(A) requires GFCI protection for temporary installations lasting more than 90 days
Question 5
Under NEC 2020, which of the following areas requires AFCI protection for 120-volt branch circuits in dwelling units?
Correct Answer: Garages
Why: NEC 210.12(A) requires AFCI protection for garages in dwelling units
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