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#120981 - 06/02/05 09:10 PM -Bathroom Ground-
electure Offline


Registered: 12/24/00
Posts: 4226
Loc: Fullerton, CA USA
I discovered this one during a bath remodel.

Under the lavatory, buried in the wall-

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-

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

What do ya' think?

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

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#120982 - 06/02/05 09:25 PM Re: -Bathroom Ground-
Larry Fine Offline

Registered: 02/18/05
Posts: 684
Loc: Richmond, VA
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 - 06/02/05 09:27 PM Re: -Bathroom Ground-
stamcon Offline

Registered: 03/24/01
Posts: 322
Loc: So San Francisco CA
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 06:29 AM Re: -Bathroom Ground-
mamills Offline

Registered: 11/30/01
Posts: 739
Loc: Wharton, Texas, USA
That's not a PLASTIC pipe in that first pic, is it?

Mike (mamills)

#120985 - 06/03/05 05:21 PM Re: -Bathroom Ground-
n1ist Offline

Registered: 02/13/02
Posts: 176
Loc: Malden MA
Looks like 1/2" copper to me...

#120986 - 06/03/05 08:38 PM Re: -Bathroom Ground-
electure Offline


Registered: 12/24/00
Posts: 4226
Loc: Fullerton, CA USA
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 - 06/03/05 09:40 PM Re: -Bathroom Ground-
sandsnow Offline

Registered: 09/21/04
Posts: 163
Loc: Irvine, CA, USA
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 01:36 AM Re: -Bathroom Ground-
Trumpy Offline


Registered: 07/05/02
Posts: 8532
Loc: SI,New Zealand
I'd be interested to see how connections like this would actually carry the high fault current that they are supposed to.
What sort of filler is that, in that piece of NM cable?.
It looks like it would burn pretty readily.
Let's face it, these days if you're not young, you're old - Red Green grin

#120989 - 06/04/05 11:47 AM Re: -Bathroom Ground-
e57 Offline

Registered: 05/27/03
Posts: 2837
Loc: S.F.,CA USA
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 02:08 PM Re: -Bathroom Ground-
Alan Belson Offline

Registered: 03/23/05
Posts: 1801
Loc: Mayenne N. France
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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