ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
AreMetal Ladders Ever OK For Electrical Work?
by gfretwell. 01/22/18 01:15 AM
VDE 0100 to introduce AFCIs
by sparky. 01/20/18 05:09 PM
MRI LED lights dimmer control replacement - wow!
by Potseal. 01/19/18 08:52 PM
Video: Inventor of the GFCI self-testing shocks
by Bill Addiss. 01/17/18 11:11 PM
New in the Gallery:
Housebilding DIY wiring
SE cable question
Who's Online Now
0 registered members (), 5 guests, and 7 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
isolated ground system, sorta i think #101658
08/12/02 04:22 PM
08/12/02 04:22 PM
F
frank  Offline OP
Member
Joined: May 2001
Posts: 376
windsor ontario canada
I was sent to wire a 220v 30a receptical in a phone room.At the panel i see two grounding bars,one sandard and one isolated.The standard is not used and there is no standard or isolated ground wires from source or load to it.The isolated grounding bar is almost full with a mixture of insulated and bare ground wires.
All the recpticals are orange with black and red.Since the isolated ground would be compromised by the bare ground wires ect.I don't understand the concept but i have seen it in old hospital O.R's for line isolation monitors where they ran 12/2 bx with the bare ground bonded to the box then the isolated grounding screw on the plug?

Tools for Electricians:
Re: isolated ground system, sorta i think #101659
08/29/02 03:54 PM
08/29/02 03:54 PM
B
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
There are all kinds of so-called isolated-ground bars, and these too can be {seriously} misunderstood and misapplied. [Such ‘accepted’ practices are not automatically the best from a electrical-power engineering or ‘legal’ standpoint.] Also, telecomm practices generally far predate the introduction of 'orange-faced' wiring devices.

The next step would be to precisely determine the need based or the current published installation manual for the device being powered. Whatever someone says, or regardless of any arm waving in the process, standing published information should turn the key.


Featured:

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

 

Member Spotlight
Theelectrikid
Theelectrikid
Levittown, PA
Posts: 810
Joined: April 2004
Show All Member Profiles 
Top Posters(30 Days)
Admin 21
sparky 16
Potseal 15
Popular Topics(Views)
243,592 Are you busy
180,388 Re: Forum
170,861 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.016s Queries: 14 (0.003s) Memory: 0.9415 MB (Peak: 1.0551 MB) Zlib enabled. Server Time: 2018-01-22 10:13:25 UTC