250.64B

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Re: 250.64B

Originally posted by throttlebody:
I would like to add to this if I may.
The conductor being used outside is direct burial rated, correct? I had inspector point this out to me years ago and then It had to start being buried 24" deep before leaving the wall to the rod clamping devices and so forth.
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I don't believe it has to be. A GEC may be bare copper. If you can direct bury a bare copper wire, is there any reason you can't bury one that happens to have insulation? So what if the insulation breaks down, since a bare wire is allowed.

Also, 250.64(B) says you only need to bury to 12".
 
Re: 250.64B

"Also, 250.64(B) says you only need to bury to 12". "

What year NEC are you referencing?

I did not know there was any reference as to the minimum burial depth for GEC at all.

[ January 29, 2006, 07:44 PM: Message edited by: pierre ]
 
Re: 250.64B

I would hate to have to drive the top of a rod or rods to 24" below grade so the conductor would be 24".

With that in mind, would we then have to insulate the rods with an insulation suitable for direct burial?

In other words, would we have to match the conductors insulation, and if we did, would the rods be doing anything at all even though in reality they are pretty much a waste of energy anyways? :D

Roger

[ January 29, 2006, 07:56 PM: Message edited by: roger ]
 
Re: 250.64B

Originally posted by pierre:
"Also, 250.64(B) says you only need to bury to 12". "

What year NEC are you referencing?

I did not know there was any reference as to the minimum burial depth for GEC at all.
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It looks like I need to retract that statement. I have a preliminary version of the 2005 NEC and that is where I found it (with a reference to ROP 5?150, 5?154). Its much quicker and easier to access than the free one on the NFPA site. But I just checked the official 2005 code and that sentence is not in there. This is the first thing I've found that was in the preliminary version that was not in the final version.

Sorry...
 
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