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#120981 06/03/05 12:10 AM
Joined: Dec 2000
Posts: 4,294
I discovered this one during a bath remodel.

Under the lavatory, buried in the wall-

[Linked Image]

The conductor was spliced with a barrel crimp to 4 conductors above the ceiling, and the 4 wires were attached to the boxes in this fashion-

[Linked Image]

The branch circuit was supplied by this NM cable, containing a #16 ground wire, which was connected in the usual manner at the panel-

[Linked Image]

What do ya' think?

[This message has been edited by electure (edited 06-03-2005).]

#120982 06/03/05 12:25 AM
Joined: Feb 2005
Posts: 693
Homestly, I think it's one of the better-done retro-grounding jobs I've seen. At least the nut and bolt were used for no ther purpose.

Larry Fine
Fine Electric Co.
#120983 06/03/05 12:27 AM
Joined: Mar 2001
Posts: 333
The ground strap is very common(original to the house)in the Bay Area, but I've only seen the reduced ground NM a couple of times.


#120984 06/03/05 09:29 AM
Joined: Nov 2001
Posts: 745
That's not a PLASTIC pipe in that first pic, is it? [Linked Image]

Mike (mamills)

#120985 06/03/05 08:21 PM
Joined: Feb 2002
Posts: 183
Looks like 1/2" copper to me...

#120986 06/03/05 11:38 PM
Joined: Dec 2000
Posts: 4,294
Yes, it's 1/2" copper, and cast iron drain with really-by-golly lead and oakum joints.

This house was custom built in 1958. This is original as installed.

#120987 06/04/05 12:40 AM
Joined: Sep 2004
Posts: 167
Hey Dude!!!
What were you doing in my house????
My place was done pretty much the same way.
See here

The ground was attached by the same type of clamp to the local water line in the bathroom and then around the nail for the box.

Larry LeVoir
City of Irvine, CA
#120988 06/04/05 04:36 AM
Joined: Jul 2002
Posts: 8,443
Likes: 3
I'd be interested to see how connections like this would actually carry the high fault current that they are supposed to. [Linked Image]
What sort of filler is that, in that piece of NM cable?.
It looks like it would burn pretty readily. [Linked Image]

#120989 06/04/05 02:47 PM
Joined: May 2003
Posts: 2,876
e57 Offline
Wasn't the cold water allowed to be used as a GEC/EGC up until prior to '93 NEC? When did the 5' rule come up for point of connection to water? It was the way it was done for a while, not sure when that 'while' was though. It seems 40's- 60's.

Trumpy, that filler is craft paper, still used in romex, and other cables.

Mark Heller
"Well - I oughta....." -Jackie Gleason
#120990 06/04/05 05:08 PM
Joined: Mar 2005
Posts: 1,803
I remember dad using that cast-iron pipe. To seal it they rammed tow (oakum) and boss-white, (a mix of powdered chalk and linseed oil), in the annulus, followed by lead-wool hammered in with a wooden spoke. Another American pipe used in the UK at that time (late forties) was made of paper-pulp and molten tar,(made in a vacuum), with the ends taper machined. It was brilliant- light, strong & supple with foolproof joints- just hammered together with a dolly. Then upvc arrived.

Wood work but can't!
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