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#85256 - 06/13/03 07:22 PM unmetered leg  
ccdave  Offline
Member
Joined: Jan 2003
Posts: 59
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???????
thanks--dave


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#85257 - 06/13/03 09:26 PM Re: unmetered leg  
sparky  Offline
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Joined: Oct 2000
Posts: 5,308
the most local earth contact available would get my vote.....


#85258 - 06/13/03 11:08 PM Re: unmetered leg  
resqcapt19  Offline
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Joined: Nov 2000
Posts: 2,148
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.
Don


Don(resqcapt19)


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