ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Trumpy 5
Recent Posts
What do you do?
by gfretwell. 09/24/17 12:05 PM
75 kva tranformer
by sparkync. 09/23/17 06:41 PM
Another generator question
by gfretwell. 09/23/17 04:15 PM
Supporting conduit bodies
by ghost307. 09/18/17 12:12 PM
Thermal Imaging Camera upgrade
by Potseal. 09/18/17 11:57 AM
New in the Gallery:
Gallery Test
Popular Topics(Views)
240,956 Are you busy
176,756 Re: Forum
168,602 Need opinion
Who's Online Now
0 registered members (), 73 guests, and 7 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#218272 - 03/07/17 12:48 AM bonding a 37.5 single phase transformer  
lite bulb  Offline
Member
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.


2017 / 2014 NEC & Related Books and Study Guides

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


Member
Joined: Jul 2004
Posts: 9,118
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
Member
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.



Member Spotlight
Posts: 165
Joined: March 2007
Show All Member Profiles 
Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.011s Queries: 15 (0.003s) Memory: 0.7528 MB (Peak: 0.8772 MB) Zlib enabled. Server Time: 2017-09-26 17:57:22 UTC