Master Article 330 - Metal-Clad Cable

Question 1

According to NEC 2023 Article 210.8, GFCI protection is required for all 15- and 20-ampere, 125-volt receptacles in which location?

1. Attics
2. Storage rooms
3. Equipment rooms
4. Mechanical rooms with sinks

Correct Answer: Mechanical rooms with sinks

Why: NEC 2023 Article 210.8(A)(10) requires GFCI protection for receptacles in mechanical rooms with sinks or HVAC equipment.

Question 2

Under NEC 2023 Article 625.54, what is the maximum voltage allowed for EV charging equipment installed in dwelling units without special considerations?

1. 240 volts
2. 277 volts
3. 480 volts
4. 600 volts

Correct Answer: 240 volts

Why: NEC 2023 Article 625.54 limits dwelling unit EV charging equipment to 240 volts maximum unless special safety provisions are met.

Question 3

According to NEC 2023 Article 314.16(B)(1), when calculating box fill for conductors, what is the volume allowance for each 12 AWG conductor?

1. 2.00 cubic inches
2. 2.25 cubic inches
3. 2.50 cubic inches
4. 3.00 cubic inches

Correct Answer: 2.25 cubic inches

Why: NEC 2023 Article 314.16(B)(1) specifies the volume allowance of 2.25 cubic inches for each 12 AWG conductor.

Question 4

Per NEC 2023 Article 250.68(C), which of the following methods is NOT acceptable for connecting grounding electrode conductors to grounding electrodes?

1. Listed lugs
2. Exothermic welding
3. Listed pressure connectors
4. Wire nuts rated for direct burial

Correct Answer: Wire nuts rated for direct burial

Why: NEC 2023 Article 250.68(C) requires grounding electrode connections to be made by listed means, and standard wire nuts are not suitable for this application.

Question 5

Under NEC 2023 Article 358.30(A), what is the maximum spacing for EMT supports in horizontal runs?

1. 8 feet
2. 10 feet
3. 12 feet
4. 14 feet

Correct Answer: 10 feet

Why: NEC 2023 Article 358.30(A) requires EMT to be supported at least every 10 feet in horizontal runs.