ground through hinge

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Twoskinsoneman

Twoskinsoneman

Senior Member
Location
West Virginia, USA NEC: 2020
Occupation
Facility Senior Electrician
another weird question. Would you accept a hinge as grounding the door of an enclosure. We use nylon washers to screw our panited enclosure doors closed. The painted door is mated against a painted frame. The only place you would get metal contact is through the stainless steel hinge. Is grounding through a hinge good enough?

I remeber as an aircraft mechanic the flight surfaces always had bonding straps crossing the hinges. Also I have see this on commercial enclosure doors.
 
In NFPA 79 section 8.2.3.6.1 states that a bonding jumper is required if electrical devices are mounted on the door if it is conductive material. If no electrical devices are mounted to your door or cover then no jumper is needed.
 
Twoskinsoneman said:
Really. Do know where I could get online access to it? Or what is the best wayto find the requirment.
Thanks
Click to expand...

Go to www.nfpa.org, click on the "list of codes and standards", and choose the code you want.

At the bottom of the page, you will see a link to "view the 2007 edition of this code."

Steve
 
Enclosure Door Grounding Jumper

Enclosure Door Grounding Jumper

Your original inquiry hits the nail on the head.. "would you accept this"?

You need to ask the AHJ. He(or she) is the one you have to satisfy.

Some enclosures have a friction positioned continuous "piano hinge" that had in the past been recognized and a sufficient grounding method.

Some enclosures have doors that can be readily lifted off of merely two loosely fitted vertical hinge points.

Some enclosures have NO control devices mounted on the door, and others have 24vdc class 2 system devices, and others have 480vac power switching devices on the door.

In Ontario Canada, ALL industrial electrial enclosures on machines must have the jumper regadless of hinge contruction or devices mounted on door. Most European safety directives also have this requirement.

Solutions:
A. Use common sense (Would YOU want to handle the door with energized devices on it?)
B. Check with the AHJ
or
C. Bond strap the door and forget about it.
 
IMM_Doctor said:
Your original inquiry hits the nail on the head.. "would you accept this"?

You need to ask the AHJ. He(or she) is the one you have to satisfy.

Some enclosures have a friction positioned continuous "piano hinge" that had in the past been recognized and a sufficient grounding method.

Some enclosures have doors that can be readily lifted off of merely two loosely fitted vertical hinge points.

Some enclosures have NO control devices mounted on the door, and others have 24vdc class 2 system devices, and others have 480vac power switching devices on the door.

In Ontario Canada, ALL industrial electrial enclosures on machines must have the jumper regadless of hinge contruction or devices mounted on door. Most European safety directives also have this requirement.

Solutions:
A. Use common sense (Would YOU want to handle the door with energized devices on it?)
B. Check with the AHJ
or
C. Bond strap the door and forget about it.
Click to expand...

Thanks for the input Doc. I do realize that the AHJ would be available to make a judgment call. My question was to put everyone who reads it in the position of being the AHJ and ask what they would do.
It's not a current disagreement I am having with anyone just pure curiosity of others opinions. (It helps to form my own to hear experts explain the reason they do things)
 
jim dungar said:
If there is no wiring to/on the door, I do not require a bonding jumper.
Click to expand...

The door falls into that "likely to become energized" area. By it self as a door it is probably not, with something energized mounted to it I think it is likely to become energized and requires a bonding jumper.
 
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