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Electrical Assessment Flashcards

7 cards from real NEC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Electrical Assessment flashcards as text

  1. What is the minimum size equipment grounding conductor (copper) for a circuit protected by a 100A overcurrent device per Table 250.122?

    Answer: 8 AWG

    NEC Table 250.122 specifies 8 AWG copper for a 100A overcurrent device.

  2. A multiwire branch circuit must have a means to simultaneously disconnect which conductors at the panel?

    Answer: All ungrounded conductors

    NEC 210.4(B) requires simultaneous disconnection of all ungrounded conductors of a multiwire branch circuit.

  3. What is the maximum overcurrent protection allowed for 14 AWG copper conductors under the small-conductor rule?

    Answer: 15 A

    NEC 240.4(D) limits 14 AWG copper to 15A overcurrent protection.

  4. Where a panelboard is used as service equipment, the maximum number of main disconnects (the 'six-throw rule' before recent editions) was historically limited to how many?

    Answer: 6

    The traditional rule allowed up to six service disconnecting means; recent NEC editions require a single main in many cases.

  5. What is the minimum working space depth (front) required for equipment 0-150V to ground with exposed live parts on one side, grounded on the other (Condition 1)?

    Answer: 3 ft

    NEC Table 110.26(A)(1) requires 3 ft of clear working space for Condition 1 at 0-150V.

  6. Flexible cords and cables may NOT be used as a substitute for what?

    Answer: Fixed wiring of a structure

    NEC 400.12 prohibits using flexible cords as a substitute for the fixed wiring of a structure.

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

    Answer: 3%

    The NEC recommends a maximum 3% voltage drop on a branch circuit (5% total for feeder plus branch).