ECN Forum Forums General Topics of the Trade General Discussion Area Grounding Electrode History

I need some help for an extra credit paper I am writting, and of course I waited until the last minute so I do not have time to research this one.

Does anyone know when the NEC started requiring a supplemental grounding electrode for a metal underground water pipe, or has it always been that way?

Thanks,
Frantic Engineering Student

IAEI Soares' Book on Grounding is a good reference.




[This message has been edited by Bjarney (edited 03-18-2003).]