1000a +

[Hendrix]

Does all grounded switch gear over 1k amps automaticly come with gfci protection?

 

[bphgravity]

See section 230.95 of the NEC. (Ground-Fault Protection of Equipment. NOT GFCI)

 

[augie47]

(short answer) No :grin:

Only disconnects 1000 amp or more and systems > 150 volts to ground require GFP, so a 1k amp MLO service panel with 400 amp beakers would not need GFP nor would a 208Y/120 service.
In addition, there are exceptions to the rule.

 

[Hendrix]

See section 230.95 of the NEC. (Ground-Fault Protection of Equipment. NOT GFCI)

My bad, meant GFP.

 

[Coastalguy1]

In agreement....my problem

In agreement....my problem

I agree with 230.95. I have a problem with a GFP 1600amp 277/480v service that keeps tripping the GFP main when an air conditioning compressor fails. In the past it tripped when a maintenance man was changing a light bulb and shorted wires together. I am told that they have adjusted the setting of the GFP breaker to it's maximum allowed setting. Any advice on correcting this problem?
thank you,

 

[Cow]

I agree with 230.95. I have a problem with a GFP 1600amp 277/480v service that keeps tripping the GFP main when an air conditioning compressor fails. In the past it tripped when a maintenance man was changing a light bulb and shorted wires together. I am told that they have adjusted the setting of the GFP breaker to it's maximum allowed setting. Any advice on correcting this problem?
thank you,

Zog or Brian John on here would be the guys to ask.

I imagine you'll need a coordination study done by a reputable outfit. Simply turning the dial up isn't the right way to go about it.

 

[iwire]

I have a problem with a GFP 1600amp 277/480v service that keeps tripping the GFP main when an air conditioning compressor fails. In the past it tripped when a maintenance man was changing a light bulb and shorted wires together.

That is odd, as a light bulb is usually 120 volt and the 480 volt main GFP would never see a ground fault on 208 or 120 volt circuits.

 

[kwired]

That is odd, as a light bulb is usually 120 volt and the 480 volt main GFP would never see a ground fault on 208 or 120 volt circuits.

maybe it was a 277 volt luminaire. Or even 480 volt. Maintenance man may have been doing more than just changing a lamp - especially if he already tried that and it still did not work.

 

[iwire]

maybe it was a 277 volt luminaire. Or even 480 volt. Maintenance man may have been doing more than just changing a lamp - especially if he already tried that and it still did not work.

All I am saying is it is odd, I am aware of the possibilities.

 

[stevebea]

maybe it was a 277 volt luminaire. Or even 480 volt. Maintenance man may have been doing more than just changing a lamp - especially if he already tried that and it still did not work.

Even shorting the secondary side of a HID ballast would have no effect on the GFP.