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#218272 - 03/07/17 12:48 AM bonding a 37.5 single phase transformer  
lite bulb  Offline
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Joined: Feb 2006
Posts: 78
wilm,de.
I'm installing a 480/120/240 single phase transformer to feed a 150 amp panel 120/240 in a remote wood building which is a air compressor room no steel to bond to 200' away from the main service. Do I need to run a 3/0 from the building steel of the plant which the main service is grounded to to bond the transformer or is two ground rods all I need.


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#218273 - 03/07/17 01:34 AM Re: bonding a 37.5 single phase transformer [Re: lite bulb]  
gfretwell  Offline


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Joined: Jul 2004
Posts: 9,123
Estero,Fl,usa
I think all you "need" is two 8' ground rods on a 6 gauge GEC. You could make that better with longer rods or a ground ring. I am not sure where a plate ranks because I have never seen one or heard much about them.
I know of no rule that requires running a 250.66 GEC back to the other building. At 200', voltage drop will need to be in your calculations tho


Greg Fretwell

#218274 - 03/07/17 01:51 AM Re: bonding a 37.5 single phase transformer [Re: lite bulb]  
lite bulb  Offline
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Joined: Feb 2006
Posts: 78
wilm,de.
In the past I think a ground testing company made me go back to the grid and I had two rods driven but I'm not sure.



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