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#96825 - 12/31/05 06:45 AM 'Metal Water Piping System'
jes Offline

Registered: 07/12/02
Posts: 103
Loc: CT
Does anyone live in a jurisdiction where metal soil pipe (DWV) is considered part of the 'metal water piping system' and is therefore required to be bonded? Does anyone do this as a matter of course? What are the criteria to select the bonding jumper and do you connect together sections that may be separated by plastic?
How about using it as a grounding electrode if it exits the house underground?

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#96826 - 12/31/05 06:52 AM Re: 'Metal Water Piping System'
iwire Offline

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
Personally I would not call what is in that pipe 'water'.

250.52 Grounding Electrodes.
(A) Electrodes Permitted for Grounding.
(1) Metal Underground Water Pipe.

250.104(B) Other Metal Piping. Where installed in or attached to a building or structure, metal piping system(s), including gas piping, that may become energized shall be bonded.....

Do you think the waste pipe may become energized?

I think that would take very unusual circumstances.
Bob Badger
Construction & Maintenance Electrician

#96827 - 12/31/05 07:51 AM Re: 'Metal Water Piping System'
renosteinke Offline
Cat Servant

Registered: 01/22/05
Posts: 5305
Loc: Blue Collar Country
I suppose that bonding the drain pipe isn't a bad idea. This would even be desireable in the case of a sump pump, or a 'pump-up' toilet, or other electrical equipment being present that uses the drain line.
In that case, I would prefer to make my bond at the equipment, rather than to a main line. Even cast iron pipe is assembled in a manner that may provide a poor connection between separate pieces. So let's put the electric "drain" near where the electric "leak" is likely to be!


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