Re: OT: Tracing an electrical line

Posted by John T on October 03, 2005 at 13:06:27 from (66.244.90.98):

In Reply to: Re: OT: Tracing an electrical line posted by dr.sportster on October 03, 2005 at 08:48:25:

dr. Thanks for the good feedback to which I agree. They make GFI "Receptacles" which would protect any loads or lines connected to and/or wired "downstream" of the unit and they also make GFI "Circuit Breakers" which would protect the feeder PLUS any downstream loads. As I understand them there's a torroidal coil through which BOTH the Line and Neutral pass. If the curents the same in BOTH they cancel each other out and no voltage is induced in the coil which can trigger the relay to open. However, if theres an imbalance cuz some of the current flowing to the load from the Line IS NOT ALL BEING RETURNED VIA THE NEUTRAL that means some portion of it it may be leaking off to ground or the equipment user etc. OUCH !!!!!!!!!!!

Therefore I agree with your statements and appreciate someone actually reads these posts n thinks about them plus takes the time n cares enough to reply. If the posters feeder wires (to that GFI receptacle) had a fault it may or may not be sufficient to clear his protective device and wouldnt necessarily cause his GFI "Receptacle" to trip out as it wouldnt see the unbalanced flow upstream of it HOWEVER if he had a GFI "Circuit Breaker" feeding n protecting that feeder wire, it would.

I never consider a GFI "Receptacle" as an overcurrent protrctive safety device, only as protection if the line current flowing out of it isnt balanced by the returned Neutral current. The GFO "Circuit Breaker" however serevs as BOTH overcurrrent protection PLUS GFI.

I love this Sparky chit chat even if we bore others lol

Thanks again, John T retired engineer

Follow Ups:

• Re: OT: Tracing an electrical line dr.sportster 13:25:37 10/03/05 (0)

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