ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Inspection camera help
by Bill Addiss. 09/19/18 10:50 PM
220/230/240V 60Hz Systems
by gfretwell. 09/16/18 12:37 PM
Acronis Backup 2017
by gfretwell. 09/16/18 12:46 AM
Tingle off the water spigot
by Trumpy. 09/15/18 03:24 AM
Lighting Load questions
by HotLine1. 09/14/18 07:04 PM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 38 guests, and 22 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
bonding a 37.5 single phase transformer #218272
03/07/17 12:48 AM
03/07/17 12:48 AM
L
lite bulb  Offline OP
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
Re: bonding a 37.5 single phase transformer [Re: lite bulb] #218273
03/07/17 01:34 AM
03/07/17 01:34 AM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,287
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
Re: bonding a 37.5 single phase transformer [Re: lite bulb] #218274
03/07/17 01:51 AM
03/07/17 01:51 AM
L
lite bulb  Offline OP
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.


Featured:

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

 

Member Spotlight
MarkC10
MarkC10
CA, Inland Empire
Posts: 43
Joined: September 2013
Show All Member Profiles 
Top Posters(30 Days)
Admin 13
Trumpy 11
sparky 9
Popular Topics(Views)
249,299 Are you busy
187,233 Re: Forum
176,597 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.015s Queries: 15 (0.003s) Memory: 0.9518 MB (Peak: 1.0773 MB) Zlib enabled. Server Time: 2018-09-20 07:09:45 UTC