Ground fault / residential
- Thread starter 1002
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vasparky27
Member
- Location
- Chesapeake, Va.
Re: Ground fault / residential
whew good too know is it somethind that a home inspector will hit me on or just AHJ?
whew good too know is it somethind that a home inspector will hit me on or just AHJ?
- Location
- Windsor, CO NEC: 2017
- Occupation
- Hospital Master Electrician
Re: Ground fault / residential
Uhm, does it matter?
Just do it.
Uhm, does it matter?
Just do it.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Re: Ground fault / residential
You only need one feed-thru GFCI receptacle per circuit, and you can use grounding receptacles, but do not interconnect the EGC terminals. Each such protected receptacle should have the "no ground: sticker applied.
You only need one feed-thru GFCI receptacle per circuit, and you can use grounding receptacles, but do not interconnect the EGC terminals. Each such protected receptacle should have the "no ground: sticker applied.
Re: Ground fault / residential
However, a GFCI tester will not work because these do need the equipment ground to operate.
The way that the test button in a GFCI works is by connecting a small resistor around the outside of the current transformer that senses ground faults, what is known a primary injection. For instance, the internal tester runs current from the hot lead on the load side of the CT to the neutral on the line side of the CT.
However, a plug-in tester does not have access to the line side of the CT so it must use an equipment ground.
However, a GFCI tester will not work because these do need the equipment ground to operate.
The way that the test button in a GFCI works is by connecting a small resistor around the outside of the current transformer that senses ground faults, what is known a primary injection. For instance, the internal tester runs current from the hot lead on the load side of the CT to the neutral on the line side of the CT.
However, a plug-in tester does not have access to the line side of the CT so it must use an equipment ground.
hurk27
Senior Member
- Location
- Portage, Indiana NEC: 2008
Re: Ground fault / residential
I have a plug adapter for ungrounded receptacles with about 50' of wire connected to the grounding wire on it, and a clip to attached it to a known good ground source. Plug in any GFCI tester and it will trip the GFCI protecting the ungrounded circuit, It also gives me a reference to know if I have reverse polarity which is common to find in non-grounded circuits but hard to identify.
[ May 03, 2005, 02:15 AM: Message edited by: hurk27 ]
I have a plug adapter for ungrounded receptacles with about 50' of wire connected to the grounding wire on it, and a clip to attached it to a known good ground source. Plug in any GFCI tester and it will trip the GFCI protecting the ungrounded circuit, It also gives me a reference to know if I have reverse polarity which is common to find in non-grounded circuits but hard to identify.
[ May 03, 2005, 02:15 AM: Message edited by: hurk27 ]
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