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ungrounded delta and ground fault indication #102802
11/27/06 06:59 PM
11/27/06 06:59 PM
frank  Offline OP
Joined: May 2001
Posts: 376
windsor ontario canada
CEC rule 10-106 (2) where it states wiring systems supplied by an ungrounded system shall be equiped with a suitable ground detection device to indicate the presence of a ground fault.
How is this accomplished and what constitues a suitable device

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Re: ungrounded delta and ground fault indication #102803
11/27/06 07:37 PM
11/27/06 07:37 PM
twh  Offline
Joined: Mar 2004
Posts: 925
Regina, Sask.
The device is a "ground fault indicator panel". I got one from Eecol a while ago. Willet, in Estevan, Saskatchewan, makes them.

It is three transformer type panel lights. Each is connected betweeen a phase and ground. The indication is that, in the event of a ground fault, one light goes out and the other two get bright.

You can't make your own, though. It wouldn't be CSA approved.

Re: ungrounded delta and ground fault indication #102804
11/27/06 08:19 PM
11/27/06 08:19 PM
frank  Offline OP
Joined: May 2001
Posts: 376
windsor ontario canada
Im looking at an FPE GIL-600 I guess i'm asking where it would connect to the system.

[This message has been edited by frank (edited 11-27-2006).]

Re: ungrounded delta and ground fault indication #102805
11/27/06 09:08 PM
11/27/06 09:08 PM
Sandro  Offline
Joined: Dec 2001
Posts: 444
Stoney Creek, ON, Canada
Simply take it off the splitter, as you would any other load. Make sure it has a fused disconnect too.

Re: ungrounded delta and ground fault indication #102806
11/29/06 07:23 PM
11/29/06 07:23 PM
bigrockk  Offline
Joined: Jan 2003
Posts: 174
Middle of Canada
One of the systems feeding the plant where I work is a three phase ungrounded 240V Delta system. The ground fault indicators are feed directly from the load side of the main circuit breaker. (This is an old plant circa 1930's )

The ground indicators are just three bulbs connected in a wye arrangement with the centre point connected to ground. Under normal conditions all three lamps glow dimly and at equal intensity. If one phase becomes grounded the two lamps on the ungrounded phases glow brightly (they now see a full 240V) and the lamp on the grounded phase goes out. Pretty simple but it works well.


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