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GF Protection

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  1. mmacdonell is offline Junior Member Pro Subscriber
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    GF Protection

    4. Ground fault protection is required by the NEC for all solidly grounded 480Y/277V system breakers rated 1000A or greater.
    Your Answer: True
    Correct Answer: False

    Am I reading 230-95 wrong? - "Ground-fault protection of equipment shall be provided for solidly grounded wye electrical services of more than 150 volts to ground but not exceeding 600 volts phase-to-phase for each service disconnect rated 1000 amperes or more.

    Seems it should be true?

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  3. Kalbi_Rob's Avatar
    Kalbi_Rob is offline Experienced Member Pro Subscriber
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    Quote Originally Posted by mmacdonell View Post
    4. Ground fault protection is required by the NEC for all solidly grounded 480Y/277V system breakers rated 1000A or greater.
    Your Answer: True
    Correct Answer: False

    Am I reading 230-95 wrong? - "Ground-fault protection of equipment shall be provided for solidly grounded wye electrical services of more than 150 volts to ground but not exceeding 600 volts phase-to-phase for each service disconnect rated 1000 amperes or more.

    Seems it should be true?
    See this link for previous post on this question:
    https://testguy.net/threads/6272-Gro...1203#post11203

    There are exemptions to 230.95:
    http://www.cooperindustries.com/cont...ements_GFP.pdf

    Where Ground Fault Relays are NOT Required
    There are many services and feeders where 230.95, 215.10, and 240.13 do
    not require ground fault protection including:
    1. Continuous industrial process where a non-orderly shut down would increase
    hazards.
    2. All services or feeders where the disconnect is less than 1000 amps.
    3. All 208Y/120 Volt, 3, 4W (wye) services or feeders.
    4. All single-phase services or feeders including 240/120 Volt.
    5. High or medium voltage services or feeders. (See NEC 240.13 and 215.10 for
    feeder requirements.)
    6. All services or feeders on delta systems (grounded or ungrounded) such as 240
    Volt, 3, 3W delta, or 240 Volt, 3, 4W delta with midpoint tap.
    7. Service with six disconnects or less (230.71) where each disconnect is less than
    1000 amps. A 4000A service could be split into 5 - 800A switches.
    8. Resistance or impedance grounded systems.
    9. Fire Pumps
    10. For feeders where Ground Fault Protection is provided on the service (except for
    Health Care Facilities. See 517.17.)

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