Ground Fault Protection NEC 230.95?

[hassaf]

I have 3000 amps, 277/480V MAIN SWBD located outside and feeding two buildings (building #1 & #2). SWBD have two main disconnects (one for each building), 1200A & 1600A and both have ground fault protection.

Building #1 has a 1200A, 277/480 Distribution panel with a 1200A main disconnect.

Question: Does the 1200A main disconnect in building #1 required to have GFI protection even though the feeder to this building already protected by GFI at the main SWBD?

It would seem that GFI protection for that building at the main SWBD located outside is adequate. Any comments?

 

[jerryb]

Re: Ground Fault Protection NEC 230.95?

Article 230.95 specifically says to provide ground-fault protection for soldily grounded wye electrical "Services". The NEC Handbook talks about protection of equipoment on "Services" rated 1000 amps or more and operating at 277/480 volt. I see no requirement for distribution equipment other than "Service" entrance equipment.

Coordinated ground-fault pickup would be a great idea but would not be required.

 

[iwire]

Re: Ground Fault Protection NEC 230.95?

215.10 covers GFP of feeders.

215.10 Ground-Fault Protection of Equipment Each feeder disconnect rated 1000 amperes or more and installed on solidly grounded wye electrical systems of more than 150 volts to ground, but not exceeding 600 volts phase-to-phase, shall be provided with ground-fault protection of equipment in accordance with the provisions of

 

[websparky]

Re: Ground Fault Protection NEC 230.95?

Bob,

You must of forgotten to copy this part!

Exception No. 3: The provisions of this section shall not apply if ground-fault protection of equipment is provided on the supply side of the feeder.

 

[charlie]

Re: Ground Fault Protection NEC 230.95?

You might also take a look at 240.13. This applies GFP for "more than 150 volts to ground but not exceeding 600 volts phase-to-phase for each individual device used as a building or structure main disconnecting means rated 1000 amperes or more."