Grounding at Utility Transformer Poles
Grounding at Utility Transformer Poles
(OP)
I am interested in other views of utility transformer pole grounding. NESC Rule 94B indicates that pole plates and butt wraps are not to be the only grounding electrode at transformer poles.
I rarely see more than a butt wrap on transformer poles around here, particularly in areas served by smaller cooperatives.
What are the practices of other utilities, do they use a ground rod, or is the connection to the system neutral counted as another ground connection?
Thanks
jtester
I rarely see more than a butt wrap on transformer poles around here, particularly in areas served by smaller cooperatives.
What are the practices of other utilities, do they use a ground rod, or is the connection to the system neutral counted as another ground connection?
Thanks
jtester






RE: Grounding at Utility Transformer Poles
David Castor
www.cvoes.com
RE: Grounding at Utility Transformer Poles
Alan
RE: Grounding at Utility Transformer Poles
RE: Grounding at Utility Transformer Poles
RE: Grounding at Utility Transformer Poles
RE: Grounding at Utility Transformer Poles
If we know that we have >6 per km (~10 per mile) of these in our system, each bonded to our system neutral, then we do not add rod electrodes, even at transformer poles.
Our empirical tests of this setup usually results in <6 Ohms using IEEE Greet Book fall-of-potential earth resistance test.
RE: Grounding at Utility Transformer Poles