ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
sparky 5
Recent Posts
Holiday Wishes to all!!
by HotLine1. 12/15/17 07:20 PM
Dimmable LED 2x4 lay in fixtures
by HotLine1. 12/15/17 07:15 PM
2017 NEC Changes
by HotLine1. 12/15/17 07:06 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
New in the Gallery:
Gallery Test
Popular Topics(Views)
243,079 Are you busy
179,523 Re: Forum
170,436 Need opinion
Who's Online Now
0 registered members (), 6 guests, and 9 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#164008 - 05/22/07 10:22 PM Grounding Transformer  
Cinner  Offline
Member
Joined: Dec 2004
Posts: 78
Kelowna, B.C., Canada
Can you ground a transformer to a steel column of a steel building or do you have to run the ground wire to a system ground?


Tools for Electricians:

#164039 - 05/23/07 04:28 PM Re: Grounding Transformer [Re: Cinner]  
Sandro  Offline
Member
Joined: Dec 2001
Posts: 444
Stoney Creek, ON, Canada
Ontario code allows it, provided the steel building is bonded at two separate points to ground using the same size ground wire as the main service.

This is a very handy practice, say, in a machine shop that use a separate transformer for each piece of equipment.


#164070 - 05/24/07 10:47 AM Re: Grounding Transformer [Re: Cinner]  
mikesh  Offline
Member
Joined: Jun 2006
Posts: 613
Victoria, BC, Canada
My quick answer is no. there are circumstances where i would allow it but only if it can be easily proven that the building steel is continuous and solidly connected to the grounding system and electrodes. 10-700 mentions in-situ electrodes and defines what that might be. In buildings where the engineering required the steel to be bonded in 2 widely seperated places (very old code for High voltage substation grounding) and was made continuous via bonding jumpers, welding, or mechanical joints proven to be electrically continuous then we might allow the column to be part of the system ground. A lot of homework to do in an old building but might be simple to establish when the power distributution is planned and the bonding and grounding is included in the inspections of the building. The long answer is maybe.



Member Spotlight
HCE727
HCE727
Delaware County, PA, USA
Posts: 186
Joined: November 2005
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: 0.010s Queries: 15 (0.002s) Memory: 0.7520 MB (Peak: 0.8745 MB) Zlib enabled. Server Time: 2017-12-17 02:09:02 UTC