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 HotLine1. 01/22/18 07:31 PM
Photocell
by twh. 01/22/18 05:06 PM
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
New in the Gallery:
Housebilding DIY wiring
SE cable question
Who's Online Now
0 registered members (), 6 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Equipment Case Grounding #34872
02/26/04 07:06 PM
02/26/04 07:06 PM
S
sambroak  Offline OP
Junior Member
Joined: Sep 2003
Posts: 5
Charleston, SC
I have been searching the NEC for the answer to the following:

The company that I am currently working for builds mobile communications suites. We use LEX Products connectors (camlock and bates connectors) for power and grounding. We purchase different equipment (radios, routers, etc) and mount it in Hardig cases. So is it necessary to ground the rack inside the case to an external grounding braid, block, etc. or does the ground in the equipment plug take care of it. I can't find anything in the NEC that addresses this unless I'm overlooking it.

Any help or NEC reference would be greatly appreciated.

[This message has been edited by sambroak (edited 02-26-2004).]

Work Gear for Electricians and the Trades
Re: Equipment Case Grounding #34873
02/27/04 04:55 PM
02/27/04 04:55 PM
C
CDN_ELECTRICIAN  Offline
Member
Joined: Jan 2003
Posts: 73
Concord,Ontario,Canada
I don't know the exact rule but i believe that in your case as in many "All metallic electrical equipment must be bonded to ground), this would enclude enclosures.

Re: Equipment Case Grounding #34874
02/27/04 06:12 PM
02/27/04 06:12 PM
B
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
Two fundamental aspects of equipment grounding are..
  • Minimize voltage difference between exposed conductive surfaces
  • Facilitate rapid operation of overcurrent devices.

The NEC reiterates these concepts many times over.

Re: Equipment Case Grounding #34875
02/27/04 11:21 PM
02/27/04 11:21 PM
D
DougW  Offline
Member
Joined: Jun 2003
Posts: 1,143
North Chicago, IL
A little out of my area of expertise, but I'll offer my $.02...

The fact that your equipment mounts in a metal rack may be a clue...

If it's metal case screwed into place on a metal rack (bonded, as sorts), then I would think there may be an "equipment ground" terminal on the rack itself to connect to a grounding point.

But if all of the equipment is insulated, and each is provided with it's own grounding means ("grounded" / "3-prong" plug), then additional grounding should be unnecessary, IMHO

Of course, what if the metal cases for the equipment are also grounded - would these effectively ground the rack as well?

Does any of the literature that comes with your equipment discuss grounding? You may want to consult the manufacturer for additional info...

DougW, (mimicking the RCA Victor dog) staring perplexedly at the technology...

Re: Equipment Case Grounding #34876
02/27/04 11:35 PM
02/27/04 11:35 PM
S
sambroak  Offline OP
Junior Member
Joined: Sep 2003
Posts: 5
Charleston, SC
First of all thanks to everyone who replied.

I may not have made it completely clear in my original post, the case itself is plastic, and the frame on the inside is aluminum supported in the middle of the case with rubber "shocks". All equipment that we use has a 3 prong plug so the equipment is grounded, I was just trying to get some facts on whether or not the mounting frame inside the plastic case needed to have a ground attached to it. There is no metal on the ouside of the case that contacts the frame in any way. In my opinion there is no need for grounding the frame inside the case, but I was trying to find hard facts in the NEC, but have still had no luck.

Once again thanks to all who have posted.


Featured:

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

 

Member Spotlight
mxslick
mxslick
Atomic City, ID USA
Posts: 803
Joined: October 2004
Show All Member Profiles 
Top Posters(30 Days)
Admin 21
sparky 15
Potseal 15
Popular Topics(Views)
243,597 Are you busy
180,402 Re: Forum
170,868 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.018s Queries: 14 (0.003s) Memory: 0.9673 MB (Peak: 1.1049 MB) Zlib enabled. Server Time: 2018-01-23 09:48:25 UTC