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#88105 - 05/10/04 03:14 PM Workmanlike Manner/Electrical Connections 110.14
mustangelectric Offline
Member

Registered: 02/08/04
Posts: 496
Loc: Bentonville, AR
I think these article numbers prohibit the use of a cable clamp as a ground and unused cable openings as well as require workmanlike installations using parts approved for the purpose.

Please see the following in the latest NEC;
110.12
110.14

regards

greg
_________________________
Electricity has no respect for ignorance!

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2014 / 2011 NEC & Related Books and Study Guides
#88106 - 05/10/04 04:32 PM Re: Workmanlike Manner/Electrical Connections 110.14
resqcapt19 Offline
Member

Registered: 11/10/00
Posts: 2209
Loc: IL
Greg,
No one said that the cable clamp could be used to connect the EGC to the box. I and others said that the cable clamp screw with the clamp removed could be used for that purpose.
Don
_________________________
Don(resqcapt19)

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#88107 - 05/12/04 09:09 AM Re: Workmanlike Manner/Electrical Connections 110.14
Joe Tedesco Offline
Member

Registered: 10/07/00
Posts: 3325
Loc: Boston, Massachusetts USA
Not permitted! Absolutely not!

I never would allow the cable clamp threaded hole to be used for the termination of the EGC or EBJ!

Listed products identify that hole in metal boxes with "GR" or "GRND" and one regular reference is 110.3(B)!
_________________________
Joe Tedesco, NEC Consultant

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#88108 - 05/12/04 10:11 AM Re: Workmanlike Manner/Electrical Connections 110.14
CharlieE Offline
Member

Registered: 04/23/04
Posts: 204
Loc: Indianapolis
Joe, the intent is to be sure that at least two threads are fully engaged. In the case of standard boxes, it makes no difference which hole is used as long as it used for no other purpose (you will find nothing in the Code or the UL White Book that prohibits this practice). Additionally, the screw from the clamp may be used if the clamp is removed.
_________________________
Charlie Eldridge, Indianapolis Utility Power Guy

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#88109 - 05/12/04 11:41 AM Re: Workmanlike Manner/Electrical Connections 110.14
Joe Tedesco Offline
Member

Registered: 10/07/00
Posts: 3325
Loc: Boston, Massachusetts USA
Charlie:

I disagree, if the "GR" or "GRND" is engraved on the box, that is a simple instruction, besides the use of the clamp hole is going to be a problem, especially when the addition of another circuit may be considered when the box is of adequate size.

Intent is not what this is about, you know what you can find when Intent is discussed at a CMP meeting, a lot of wasted time.

Are you currenly involved in the inspection process? I thought I saw where you were?
_________________________
Joe Tedesco, NEC Consultant

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#88110 - 05/12/04 12:07 PM Re: Workmanlike Manner/Electrical Connections 110.14
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
Joe so you would fail this based on 110.3(B)?

So using a nut and bolt or a ground clip to terminate the grounding conductor would also be a violation?

This is the type of enforcement that makes people avoid inspections.

The clamp machine screw can (minus the clamp) can safely perform the function of grounding the box.

Being forced to change this by an inspector would only be for the inspectors amusement as it certainly is not a NEC violation.
_________________________
Bob Badger
Construction & Maintenance Electrician
Massachusetts

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#88111 - 05/12/04 12:27 PM Re: Workmanlike Manner/Electrical Connections 110.14
Joe Tedesco Offline
Member

Registered: 10/07/00
Posts: 3325
Loc: Boston, Massachusetts USA
 Quote:
Joe so you would fail this based on 110.3(B)?
So using a nut and bolt or a ground clip to terminate the grounding conductor would also be a violation?

This is the type of enforcement that makes people avoid inspections.

The clamp machine screw can (minus the clamp) can safely perform the function of grounding the box.

Being forced to change this by an inspector would only be for the inspectors amusement as it certainly is not a NEC violation.


We are discussing the hole for the clamp screw! The use of a bolt and nut or a "LISTED" clip is acceptable.

When you install cables, such as MC or AC under a clamp and terminate the EBJ (the pigtail) where do you terminate it?

If the box has the threaded hole, that's where it should be.

If there was an accident, you would not be able to satisfy the judge and jury that it was OK because you said so.

Any inspector who allows this is not doing their job.

Again, put the inspector's hat on for a while!
_________________________
Joe Tedesco, NEC Consultant

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#88112 - 05/12/04 02:19 PM Re: Workmanlike Manner/Electrical Connections 110.14
resqcapt19 Offline
Member

Registered: 11/10/00
Posts: 2209
Loc: IL
Joe,
 Quote:
Any inspector who allows this is not doing their job.

As you so eloquently said it in the other thread on this same subject.

Hogwash!!

Don

[This message has been edited by resqcapt19 (edited 05-12-2004).]
_________________________
Don(resqcapt19)

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#88113 - 05/12/04 04:46 PM Re: Workmanlike Manner/Electrical Connections 110.14
Electricmanscott Offline
Member

Registered: 01/12/02
Posts: 1478
Loc: Holden, MA USA
Of all the things for an inspector to bitch about this would not even be on my list.

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#88114 - 05/13/04 02:59 PM Re: Workmanlike Manner/Electrical Connections 110.14
Electricmanscott Offline
Member

Registered: 01/12/02
Posts: 1478
Loc: Holden, MA USA
I checked some boxes today and none were marked "GR". After reading all the posts about this, I used the clamp screw In the clamp screw hole. Clamp removed of course.

[This message has been edited by Electricmanscott (edited 05-13-2004).]

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