Ground Fault Wiring


Old 01-22-01, 12:09 PM
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I have a 1920's home that is wired w/ 2 wire and no ground. I am trying to put in GFCI and was told to wire a pigtail from the ground nut on the GFCI to the common (white) wire since both of these are wired together at the breaker panel anyway.
Is this correct?
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Old 01-22-01, 12:17 PM
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Absolutely not.

The GFI will sense a white wire conneted to the bare wire and immediately trip. The only place that a white can touch a bare in an electrical system is in the main panel.

If you are using this GFI to protect your three prong receptacles that replaced two prong recepatacles. You most likely will have to put the GFI under the panel and run from the breaker to the line side of the GFI then run the circuit conductor to the load side of the GFI. This will protect all receptacles on that circuit. The reason that I suggest placing the GFI protection at the panel is because the wiring style of receptacle circuits in the time frame of hte installation using two prong receptacles ran the power to a light fixture and then came out to the receptacles on that circuit from that light box in an octopus style wiring method. In this type of wiring style there is no first receptacle to place a GFI receptacle device to protect all receptacles on that circuit.

You may also replace your breaker with a GFI breaker but that cost more. Just does the same thing as the receptacle styly GFI.

Good Luck

Old 01-24-01, 04:19 PM
Join Date: Sep 2000
Location: Fayetteville, NY, USA
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NEC requires ungrounded 3-prong receptacles to bo GFI protected. If you ain't got no ground wire you can't legally have three prongs. Period. One thing not mentioned - if you utilize GFI protection on recptacles that have no ground wire you must label each and every one "No equipment ground". There are little tiny stickers included in the package with most GFI recpetacles.

Good luck,

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