ground

[jim123]

Installing new receptacles in an old office building. When taking out the old three prong receptacles, discovered there was not a ground wire in any of the boxes. Went back to the panel, and I found a 3phase 120,208v with no ground wire with the feeders. Looks like somebody had added some new outlets and ran a ground but just mounted the ground wire to the can. Is that acceptable ? Looks like its all in emt for what I can see. In the room I'm doing I putting GFCI in all the receptacle, but could I pig tale a ground wire from the box to the receptacles and install a three prong receptacle using the conduit for a ground. Thanks

 

[augie47]

A properly installed EMT system can serve as the equipment grounding conductor. 250.118

 

[ActionDave]

Pig tail from the recpt to the box is good.

If there are self grounding recpts installed you don't even need to do that. Those are the kind that have the little tab or wire that hold one of the screws in. I don't see a real need for GFCI.

 

[Sierrasparky]

GFCI come self-grounding also.

 

[ptonsparky]

How old is the building? At one time it was common for the 6/32 to act as the path. Eventually NEC required a direct box to yoke contact but many ignored the paint or the paper washer.

Pigtailing the EG to the box is good.