Practice Test Geeks(E2) E2 Commercial Electrical Inspector Practice Test
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Overcurrent Protection Devices Flashcards

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  1. NEC 230.95 requires ground-fault protection of equipment (GFPE) for solidly grounded wye services over 150V to ground, not exceeding 600V phase-to-phase, when the service disconnecting means is rated at or above:

    Answer: 1000 amperes

    NEC 230.95 requires GFPE for solidly grounded wye services exceeding 150V to ground but not more than 600V phase-to-phase when the service disconnecting means is rated 1000 amperes or more.

  2. Per NEC 240.83(D), circuit breakers used to switch 120-volt or 277-volt fluorescent lighting circuits must be listed and marked:

    Answer: SWD or HID

    NEC 240.83(D) requires circuit breakers switching fluorescent lighting on 120V or 277V circuits to be listed and marked SWD (Switching Duty) or HID (High-Intensity Discharge).

  3. NEC 240.87 requires arc energy reduction measures for circuit breakers where the instantaneous trip setting is:

    Answer: 1200 amperes or more

    NEC 240.87 requires arc energy reduction methods for circuit breakers with instantaneous trip settings of 1200 amperes or more to reduce arc flash incident energy during maintenance activities.

  4. According to NEC 240.24(A), overcurrent devices shall not be located where they will be exposed to:

    Answer: Physical damage

    NEC 240.24(A) prohibits locating overcurrent devices where they are subject to physical damage, ensuring reliable operation when needed.

  5. Per NEC 240.24(D), overcurrent devices shall not be located in the vicinity of:

    Answer: Easily ignitable material

    NEC 240.24(D) prohibits overcurrent devices from being located in the vicinity of easily ignitable material, such as in clothes closets, due to fire ignition risk from arcing.

  6. Per NEC 240.50(A), fuseholders for plug fuses shall not be used in circuits exceeding what voltage between conductors?

    Answer: 125 volts

    NEC 240.50(A) limits plug fuse fuseholders to circuits not exceeding 125 volts between conductors.

  7. Under NEC 240.81, when a single-throw circuit breaker is used as a disconnecting means, the 'ON' position of the operating handle shall be in what direction?

    Answer: Upward

    NEC 240.81 requires that for a single-throw circuit breaker, the 'ON' position of the operating handle shall be in the up direction.