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#85256 - 06/13/03 04:22 PM unmetered leg
ccdave Offline

Registered: 01/27/03
Posts: 61
Loc: culver city,calif. usa
with three options for grounding the unmetered leg of a 3 phase service, ground rod, cold water or building, which is the best and safest???????

2014 / 2011 NEC & Related Books and Study Guides
#85257 - 06/13/03 06:26 PM Re: unmetered leg
sparky Offline

Registered: 10/18/00
Posts: 5545
the most local earth contact available would get my vote.....

#85258 - 06/13/03 08:08 PM Re: unmetered leg
resqcapt19 Offline

Registered: 11/10/00
Posts: 2209
Loc: IL
You don't have a choice. If there is a metal underground water piping system, you must use it. If there is effectively grounded building steel you must use it. If they both exist, you must use them both. If you have only the water pipe, you must supplement it with a made electrode and comply with the 25 ohm rule in 250.56 for the made electrode.


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