Electrical Flashcards

What is the minimum number of 15- or 20-amp receptacle outlets in a habitable room based on the 12-foot rule?

Answer: Receptacles so no point along a wall is more than 6 feet from one

NEC 210.52(A) requires receptacles so no point along the floor line is more than 6 feet from an outlet (12-foot spacing).

What is the maximum voltage drop recommended (not mandated) for a branch circuit by NEC informational notes?

Answer: 3%

NEC informational notes recommend a maximum 3% voltage drop on a branch circuit.

Which grounding electrode is required to be supplemented by an additional electrode when used alone?

Answer: Single made (rod) electrode

NEC 250.53(A)(2) requires a single rod, pipe, or plate electrode to be supplemented unless it tests at 25 ohms or less.

What is the ampacity of a 4 AWG aluminum conductor at 75°C per Table 310.16?

Answer: 65 amps

Per NEC Table 310.16, 4 AWG aluminum at 75°C is rated 65 amps.

Tamper-resistant receptacles are required in which of the following dwelling locations?

Answer: All 125-volt, 15- and 20-amp receptacles in dwelling units

NEC 406.12 requires tamper-resistant receptacles for all 125-volt, 15- and 20-amp receptacles in dwelling units.

What is the maximum number of disconnecting means permitted for a service under the NEC 'six disconnect' rule prior to recent grouping changes?

Answer: 6

NEC 230.71 historically permitted up to six service disconnecting means grouped together.

Which conductor must never be fused or switched alone in a multiwire branch circuit's grounded path?

Answer: Grounded (neutral) conductor

NEC 240.22 prohibits placing an overcurrent device in the grounded (neutral) conductor unless it opens all conductors simultaneously.