circuits with no ground

[joebeadg]

I believe its 406.4 D 2 OK, Allows you to use grounded rec's on circuits with no ground wire if you provide GFI protection. OK, thats cool, but why the heck does it state when extending that circuit with RX that has a ground wire, it nust not be connected? What the heck difference does it make?
Also, if its good for rec's, why dosen't it aplly to anything else on a circuit? Like lights and ceiling fans.

 

[roger ober]

If the line (hot) feeding the GFIC contacts the box (metal) and you have the ground wire connected it transfers the voltage to the other box, energizing the ground in the other receptacle. Another way is in a plastic box the ground wire contacts the hot terminal it transfers the voltage to the receptacle ground. The GFCI will not trip in either case because the line side of the GFCI is not protected by the device.


Sent from my iPad using Tapatalk

 

[joebeadg]

that makes sense, although with the gr wire in the box, even though its not connected to the device, its still going to be touching the metal box, same problem. Any idea why the gfi protected circuit with no gr rule dosen't apply to light fixtures, fans and anything else?

 

[romex jockey]

I believe its 406.4 D 2 OK, Allows you to use grounded rec's on circuits with no ground wire if you provide GFI protection. OK, thats cool, but why the heck does it state when extending that circuit with RX that has a ground wire, it nust not be connected? What the heck difference does it make?
Also, if its good for rec's, why dosen't it aplly to anything else on a circuit? Like lights and ceiling fans.

I would refer you to 250.130C4 Joe.... iirc '4' was a change a few cycles ago, making it far easier to introduce an ecg in old work scenarios...>>>

250.130(C) Nongrounding Receptacle Replacement or Branch Circuit
Extensions. The equipment grounding conductor of a
grounding-type receptacle or a branch-circuit extension shall
be permitted to be connected to any of the following:

(4) An equipment grounding conductor that is part of
another branch circuit that originates from the enclosure
where the branch circuit for the receptacle or branch
circuit originates

~RJ~