ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

Topic Options
Rate This Topic
#92861 - 04/14/05 10:50 AM Grounding doors & covers
Bill39 Offline
Member
Registered: 11/28/01
Posts: 75
Loc: Indianapolis, IN, USA
Please help settle a question here at work.

Is it an NEC requirement to connect a ground wire to metal doors/covers of junction boxes and cabinets? Without the ground wire, when the hinged doors are open there is no solid ground connection to the ground bar on the back panel.

Some here are saying it is necessary to run a ground wire only when pushbuttons & lights are mounted on the doors.
Top
2017 / 2014 NEC & Related Books and Study Guides
#92862 - 04/14/05 11:12 AM Re: Grounding doors & covers
Dnkldorf Offline
Member
Registered: 12/12/04
Posts: 1064
Loc: nowhere usa
Wouldn't that be a "bonding" wire?

I am in the process of reading the 2005 Soares, and I would like to know if that would be considered grounded or bonded?

Either way, I don't think it could hurt to put the strap on the door as the hinges are not listed as bonding types.
Top
#92863 - 04/14/05 12:14 PM Re: Grounding doors & covers
Steve Miller Offline
Member
Registered: 08/30/01
Posts: 325
Loc: Loudoun Cty, VA
Since there is no source of power in the door (no indicator lights etc) there is no way for the door to become energized except thru the "can" (and that is bonded).
I vote no ... and I have absolutely no NEC reference to support it.
Top
#92864 - 04/14/05 01:40 PM Re: Grounding doors & covers
Bill39 Offline
Member
Registered: 11/28/01
Posts: 75
Loc: Indianapolis, IN, USA
Thanks for the info so far.
Just to follow up a little, I'm not sure if the proper terminology would be bonded or grounded, but IF a live wire came into contact with the door, shouldn't it be solidly grounded (bonded).

It is commonplace to run ground wires to all of the columns of a building and they don't have anything electrical mounted on them either.

Still looking for futher input.... Thanks.
Top
#92865 - 04/14/05 05:21 PM Re: Grounding doors & covers
Redsy Offline
Member
Registered: 03/28/01
Posts: 2056
Loc: Bucks County PA
I have done my share of "Hoffman" enclosures and other control cabinets, even hinged JBs in Hazardous Locations. Although Hoffman includes a tooth washer to bond the back panel and enclosure together, I've never seen accessories included to bond the door.
BTW,
I would say that any connection would be a "bonding" jumper and its purpose would be to "ground" the door by establishing a solid connection between the 2 components
Top
#92866 - 04/14/05 05:47 PM Re: Grounding doors & covers
Dnkldorf Offline
Member
Registered: 12/12/04
Posts: 1064
Loc: nowhere usa
The reason I brought up "bonding vs grounding", is because I was thinking on how you would size that jumper.

Do you size it on the largest conductor feeding the cabinet, or the largest conductor feeding the door lights or buttons?
Top
#92867 - 04/14/05 06:18 PM Re: Grounding doors & covers
Redsy Offline
Member
Registered: 03/28/01
Posts: 2056
Loc: Bucks County PA
250.102(D) would require it be sized based on OCPD rating per Table 250.122.

But,
I still don't think you need one.

[This message has been edited by Redsy (edited 04-14-2005).]
Top

Member Spotlight
Member Since: 04/03/02
Posts: 6778
New in the Gallery:
SE cable question
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box


Who's Online
1 registered (HotLine1), 61 Guests and 10 Spiders online.
Key: Admin, Global Mod, Mod
 
New in the Gallery:
SE cable question
 
Top Posters (30 Days)
Admin 47
HotLine1 43
gfretwell 19
Ruben Rocha 12
Trumpy 9
 
Newest Members
Scotto, Freecrowder, clee512, Jdscott2005, FAIZAN

ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals