Grounding a 2-Door "Hinged" Enclosure

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Dale Hayes

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We have a 600Amp OCD inside a Hoffman 2-door painted steel enclosure.

Hoffman provides a "ground stud" at each door, on both sides of the enclosure walls and a ground location on the inner panel.

1 gauge ground wire is required for the 600Amp OCD.

Hoffman offers a #4 gauge grounding strap (nothing larger than 4 gauge)

If I connect a #4 grounding strap, one from each door to the enclosure sidewalls and from there to the inner panel - will I be covered? Will (2) #4 ground straps be considered a parallel run even though they are at opposite sides of the enclosure?

Or

Do I need to find a supplier of a 1 gauge grounding strap - and have (1) 1 gauge grounding strap at each "door / to enclosure / to panel" connection?
 
Grounding a 2-Door "Hinged" Enclosure

I forgot to note that I am wanting to effectively ground the 2 doors of the enclosure.
 
Not sure there is any requirement to bond the door at all. If you feel the need to do so, why not just use some flexible #1 conductors.

You can't parallel conductors smaller then 1/0, and bonding conductors always have to be full size.
 
I was always under the impression you bonded the door with a grounding conductor sized to the OCPD feeding the devices(if installed) on the door(s). If no devices were installed on the door I never worried about it, I'd always just leave the manufacturers ground strap on it.
 
Since the conductors and locations have been provided by the manufacturer, it is possible the setup is part of the listing and has been tested for the size provided. The Standards they follow for their work is not always the NEC, such as NFPA 79.
 
Pierre C Belarge said:
Since the conductors and locations have been provided by the manufacturer, it is possible the setup is part of the listing and has been tested for the size provided. The Standards they follow for their work is not always the NEC, such as NFPA 79.
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I don't think the ground straps come with the enclosure. You have to buy them separately.
 
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