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Discussion thread for Schematic drawing posted for ECN's Member "Nick" in the Technical Reference Area under the subject heading:

GFI Wiring Schematic - Per ECN Member

Please feel free to ask questions, or make comments for Nick, in regards to this drawing.

Scott SET. 10/02/2001 07:07:00

Edit= embedded hyperlink to schematic

[This message has been edited by Scott35 (edited 10-02-2001).]

Just to add a little explanation to this one. This is a Modified Differential Ground fault system designed by GE Industrial systems for a specific project. It is just an example of how to tie together multiple services and feeds that all have, and are required to have, ground fault protection.
This one has three 4000A services (utility feeds) tied together with tie breakers. In addition to the services there are two 1500KVA generators paralleled and tied directly to one of the sub station bus via a kirk-key system. All 5 sources have ground fault protection and require neutral to ground bonds for it to operate. Not code legal you say? (I sure did at first) Well it works by forcing the neutral current to the appropriate breaker (the one in use) so it's ground fault circuitry senses properly.
It is NEC compliant if approved by the AHJ and apparently is not uncommon where multiple services are utilized.

Pretty fancy Nick,
those kir-key systems are quite the alternative to a T-switch, are there any links to read/view etc. about them that U know of?

If your looking for info on Kirk Keys check out
www.kirkkey.com

Very neat work Nick!
I think We should start a directory somewhere to catalog these things.
I'll put it on the 'to do' list


Bill