This is not a code problem. Its an engineering problem. If the grounding conductor is too long the impedance may cause a delay in the opening of the breaker. The 100 ft is a rule of thumb. To know if there is a problem you would need to caculate the fault current and check the curves for the breaker. How long is the conductor?
Re: "AHJ" says grounding elctrode conductor to long.#49231 03/02/0501:05 AM03/02/0501:05 AM
250.66 doesn't seem vary silent. it seems to be directly to the point. now I've been doen these service changes for a few years and never had the AHJ call me on the 80 some feet of ground condutor be to long. i just can't see the AHJ call me for something thats not in the code.
Re: "AHJ" says grounding elctrode conductor to long.#49235 03/02/0509:04 AM03/02/0509:04 AM
Bucketman, I agree with you, as far as the GEC there is no restriction to length as you have said and in fact if the #4 GEC is bare it becomes part of the "Electrode" and the GE's function won't be improved to any great performance level by increasing the conductor size.
With this length of #4 copper in the ground, and if we were talking about a rod, the conductor would probably provide more of a GE than the rod itself.
Bob, the GE and GEC would play no part in the operation of an overcurret device.
[This message has been edited by Roger (edited 03-02-2005).]
Re: "AHJ" says grounding elctrode conductor to long.#49236 03/02/0510:22 AM03/02/0510:22 AM