ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Single phase and what you call it.
by Scott35. 11/21/18 02:50 PM
sec cable code conflict
by HotLine1. 11/20/18 03:08 PM
This anti-theist is priceless!!!
by Texas_Ranger. 11/17/18 02:15 PM
High current GFI vs regular GFCI
by Texas_Ranger. 11/17/18 02:07 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
2 registered members (Scott35, cableguy619), 42 guests, and 29 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Grounding Transformer #164008
05/22/07 10:22 PM
05/22/07 10:22 PM
C
Cinner  Offline OP
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:
Re: Grounding Transformer [Re: Cinner] #164039
05/23/07 04:28 PM
05/23/07 04:28 PM
S
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.

Re: Grounding Transformer [Re: Cinner] #164070
05/24/07 10:47 AM
05/24/07 10:47 AM
M
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.


Featured:

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

 

Member Spotlight
BEAMEUP
BEAMEUP
WA
Posts: 27
Joined: December 2004
Show All Member Profiles 
Top Posters(30 Days)
Admin 7
Popular Topics(Views)
251,666 Are you busy
188,798 Re: Forum
178,517 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.018s Queries: 15 (0.004s) Memory: 0.9513 MB (Peak: 1.0778 MB) Zlib enabled. Server Time: 2018-11-21 20:11:51 UTC