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Ground fault protection required by NEC

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  1. ecubed is offline Junior Member Pro Subscriber
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    Ground fault protection required by NEC

    11. 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
    Help: NEC Section 230.95

    NEC Section 230.95 states ground fault protection of equipment shall be provided for solidly grounded wye electric 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.I believe the answer should be true according to this.

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    Quote Originally Posted by ecubed View Post
    11. 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
    Help: NEC Section 230.95

    NEC Section 230.95 states ground fault protection of equipment shall be provided for solidly grounded wye electric 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.I believe the answer should be true according to this.
    Only applies to services, question says all breakers.

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  5. ecubed is offline Junior Member Pro Subscriber
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    Quote Originally Posted by mbaxter1 View Post
    Only applies to services, question says all breakers.
    " for each service disconnect" which would include breakers and bolt-loc switches.

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    Quote Originally Posted by ecubed View Post
    11. 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
    Help: NEC Section 230.95

    NEC Section 230.95 states ground fault protection of equipment shall be provided for solidly grounded wye electric 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.I believe the answer should be true according to this.
    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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  9. ecubed is offline Junior Member Pro Subscriber
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    Quote Originally Posted by Kalbi_Rob View Post
    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.)
    The PDF you included is a great resource, thank you.

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