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Basic Electrical Standards Flashcards

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

Read the first 7 Basic Electrical Standards flashcards as text

  1. Per the NEC, what is the maximum rating of a single overcurrent device that may protect a multi-wire branch circuit shared by two ungrounded conductors?

    Answer: 20 amperes

    NEC 210.4 requires multi-wire branch circuits to have a means to disconnect all ungrounded conductors simultaneously, and each conductor must be protected at its ampacity.

  2. When is an arc-fault circuit interrupter (AFCI) required for bedroom circuits in a new residential installation?

    Answer: For all 15- and 20-ampere, 120-volt branch circuits

    NEC 210.12 requires AFCI protection for all 15- and 20-ampere, 120-volt branch circuits in dwelling unit bedrooms.

  3. What is the NEC requirement for securing nonmetallic sheathed cable (NM) within how many inches of a metal box?

    Answer: 12 inches

    NEC 334.30 requires NM cable to be secured within 12 inches of every metal box or fitting.

  4. A 240-volt, single-phase motor draws 18 amperes at full load. What is the minimum size inverse-time circuit breaker permitted for branch circuit protection per NEC?

    Answer: 45 amperes

    NEC 430.52 allows inverse-time breakers to be sized up to 250% of FLC; 18A × 250% = 45A, which is a standard size.

  5. Under NEC 110.3(B), what is required after installing any listed electrical equipment?

    Answer: The equipment must be used only within its listing and labeling instructions

    NEC 110.3(B) mandates that listed or labeled equipment be installed and used in accordance with its listing and labeling instructions.

  6. What is the minimum headroom required in the working space in front of electrical service equipment rated 200 amperes or less in a dwelling?

    Answer: 6.5 feet

    NEC 110.26(A)(3) requires a minimum headroom of 6.5 feet in the working space in front of electrical equipment.

  7. Which of the following best describes a 'listed' electrical product as referenced in the NEC?

    Answer: Equipment included in a list published by an OSHA-recognized testing laboratory

    NEC Article 100 defines 'listed' as equipment included in a list published by a nationally recognized testing laboratory (NRTL).