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#61114 - 01/17/06 10:31 AM 3/4" Copper Pipe Driven 8' as Ground Rod?
wendel Offline
Member

Registered: 08/07/04
Posts: 57
Rather than a copper-clad steel rod, is it acceptable to use an 8 foot piece of 3/4" copper pipe (driven into the ground) as a ground rod? Is there a requirement that the grounding rod be solid or is that to make it easier to hammer it into the ground?

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#61115 - 01/17/06 10:39 AM Re: 3/4" Copper Pipe Driven 8' as Ground Rod?
Wizzie Electric Offline
Member

Registered: 01/16/06
Posts: 59
Loc: Maple Creek, Saskatchewan, Can...
Thats a good question I would say yes because it would be the same as using the water supply as a GE. but some one will probably prove me wrong.
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#61116 - 01/17/06 10:44 AM Re: 3/4" Copper Pipe Driven 8' as Ground Rod?
Geno Offline
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Registered: 08/27/01
Posts: 16
Loc: Syracuse, NY USA
It would probably have to be listed for the purpose

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#61117 - 01/17/06 10:46 AM Re: 3/4" Copper Pipe Driven 8' as Ground Rod?
Wizzie Electric Offline
Member

Registered: 01/16/06
Posts: 59
Loc: Maple Creek, Saskatchewan, Can...
see what did i tell you. lol
geno, makes a good point. it would have to be listed for that purpose.

[This message has been edited by Wizzie Electric (edited 01-17-2006).]
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#61118 - 01/17/06 12:11 PM Re: 3/4" Copper Pipe Driven 8' as Ground Rod?
Ann Brush Offline
Member

Registered: 12/27/05
Posts: 155
Loc: Ohia
Two words: "Not listed". However......

Stick an old gate valve and solder a copper 90 on to the end of it so that it technically becomes part of the water supply system and VIOLA, its acceptable.

See we all thought plumbers were out there to make life difficult, and as it turns out

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#61119 - 01/17/06 12:57 PM Re: 3/4" Copper Pipe Driven 8' as Ground Rod?
resqcapt19 Offline
Member

Registered: 11/10/00
Posts: 2209
Loc: IL
Look at 250.52(A)(5). There is no requirement that a pipe used as a grounding electrode be a listed product.
Don
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#61120 - 01/17/06 01:21 PM Re: 3/4" Copper Pipe Driven 8' as Ground Rod?
wendel Offline
Member

Registered: 08/07/04
Posts: 57
The only physical requirement for a copper ground rod I can think of is that the volume of copper per inch in the grounding electrode be equal to or greater than the volume of copper per inch in the connecting/bonding wire. Otherwise a surge current could generate enough heat to melt the electrode while the connecting wire was still intact. Unlikely, but we're talking hypothetical extremes to help understand the right way to do things.

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#61121 - 01/17/06 01:40 PM Re: 3/4" Copper Pipe Driven 8' as Ground Rod?
GETELECTRIC Offline
Member

Registered: 10/22/03
Posts: 178
Loc: toronto canada
I would be worried about corrosion as the intent of the copper pipe was not to be buried.

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#61122 - 01/17/06 01:58 PM Re: 3/4" Copper Pipe Driven 8' as Ground Rod?
Alan Belson Offline
Member

Registered: 03/23/05
Posts: 1801
Loc: Mayenne N. France
If youre going to pretend it's plumbing (by nailing an old gate valve on top), it needs:-
a] to be at least 10 feet long.
b] an additional earth driven rod too!- see 250.53(D)(2)

Alan
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#61123 - 01/17/06 04:24 PM Re: 3/4" Copper Pipe Driven 8' as Ground Rod?
resqcapt19 Offline
Member

Registered: 11/10/00
Posts: 2209
Loc: IL
wendel,
 Quote:
The only physical requirement for a copper ground rod I can think of is that the volume of copper per inch in the grounding electrode be equal to or greater than the volume of copper per inch in the connecting/bonding wire.

The code does not contain any such requirement. 250.52(A)(5) permits the use of any metal pipe at least 8' long and with a minimum size of 3/4" to be used as a grounding electrode.
Don
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