ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Admin 2
Recent Posts
2017 NEC Changes
by HotLine1. 12/11/17 12:10 PM
Casino Wiring methods
by HotLine1. 12/09/17 10:44 AM
Ground wire Size to water Line.
by HotLine1. 12/05/17 12:11 PM
Flexible conduit to an outside Spa
by gfretwell. 12/05/17 12:28 AM
Dimmable LED 2x4 lay in fixtures
by Vulsion. 11/30/17 06:37 PM
New in the Gallery:
Gallery Test
Popular Topics(Views)
243,013 Are you busy
179,414 Re: Forum
170,372 Need opinion
Who's Online Now
0 registered members (), 19 guests, and 14 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#218272 - 03/06/17 11:48 PM 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 12:34 AM Re: bonding a 37.5 single phase transformer [Re: lite bulb]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,140
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 12:51 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
dougwells
dougwells
kamloops BC Canada
Posts: 1,141
Joined: May 2003
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: 0.012s Queries: 15 (0.003s) Memory: 0.7529 MB (Peak: 0.8773 MB) Zlib enabled. Server Time: 2017-12-12 16:03:32 UTC