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Electrical Inspections Contains discussions about electrical systems. This includes receptacles, panels, wiring, etc.

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  #1  
Old 10/6/07, 3:45 PM
Russell E. Napper Russell E. Napper is offline
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Default Number of Romex wires in one hole

Guys need some quick help. How many romex wires can be in one 1 1/2 in hole in a wood top plate. I have a circuit panel inside a garage, new construction, with the hole at the top plate completely stuffed with 12/2 romex. I have attempted to add the picture, but don't think it went through.
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Old 10/6/07, 3:55 PM
Speedy Petey Speedy Petey is offline
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Default Re: Number of Romex wires in one hole

There is no limit. Some might say this is bundling, but I seriously doubt the wires are tightly grouped together for more than 24" in this instance.
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Old 10/6/07, 4:03 PM
Russell E. Napper Russell E. Napper is offline
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Default Re: Number of Romex wires in one hole

thanks
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Old 10/6/07, 6:43 PM
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Default Re: Number of Romex wires in one hole

As many as you can without damaging the jackets of the cables.
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Old 10/6/07, 8:38 PM
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Peter Doane Peter Doane is offline
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Default Re: Number of Romex wires in one hole

Spock: An illogical approach to electricity does have its advantages on occasion, Captain.



Peter Doane
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Old 10/6/07, 8:55 PM
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tdietrich1 tdietrich1 is offline
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Default Re: Number of Romex wires in one hole

You need to address derating issues when stuffing holes with cables.

tom
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Old 10/6/07, 9:33 PM
Speedy Petey Speedy Petey is offline
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Default Re: Number of Romex wires in one hole

Quote:
Originally Posted by tdietrich1
You need to address derating issues when stuffing holes with cables.

tom
Care to support this claim?
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Old 10/6/07, 10:36 PM
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Default Re: Number of Romex wires in one hole

Quote:
Originally Posted by tdietrich1
You need to address derating issues when stuffing holes with cables.

tom
Electrical Myth #47
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Old 10/7/07, 12:24 AM
Greg Fretwell Greg Fretwell is offline
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Default Re: Number of Romex wires in one hole

You only need to derate if they stuff insulation in that hole 334.80. Do you have an energy code?
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Old 10/7/07, 9:04 AM
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Default Re: Number of Romex wires in one hole

Quote:
Originally Posted by Marc D. Shunk
Electrical Myth #47
Not around here(NE Pa) I've been getting word from other electricians that fire inspectors are looking at not just top and bottom plates, but studs and joists. So when drilling hole and running wires, we break our runs up to minimize bundling, and how many #14's and #12's go through holes. We can get the order to fire caulk every hole, as they want. The Myth is that this is coming from California, I think it's being lobbied by fire caulk makers.

tom
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Old 10/7/07, 9:41 AM
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Marc D. Shunk Marc D. Shunk is offline
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Default Re: Number of Romex wires in one hole

Quote:
Originally Posted by tdietrich1
Not around here(NE Pa) I've been getting word from other electricians that fire inspectors are looking at not just top and bottom plates, but studs and joists.
Hey, I'm in PA too, and we all work out of the same set of rules. Bundling is not bundling until it's for 24 inches or more. I'd appeal the red tag for multiple cables in a top or bottom plate in a heartbeat, and I'd have to win. The code text is very clear on that matter.
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Old 10/7/07, 10:19 AM
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Default Re: Number of Romex wires in one hole

Quote:
Originally Posted by Marc D. Shunk
The code text is very clear on that matter.
So is 90.4

So now just incase, I drill an extra hole everytime I get to 9 cc's 14# and 12# and 6 for #10.

tom
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Old 10/7/07, 10:39 AM
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Default Re: Number of Romex wires in one hole

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So is 90.4
90.4 isn't permission to make stuff up.
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Old 10/7/07, 10:48 AM
Speedy Petey Speedy Petey is offline
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Default Re: Number of Romex wires in one hole

Quote:
Originally Posted by Marc D. Shunk
90.4 isn't permission to make stuff up.
You better beileve it!
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Old 10/7/07, 10:57 AM
Speedy Petey Speedy Petey is offline
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Default Re: Number of Romex wires in one hole

The rule about derating cables through firestopped holes is new in 2005. This is ONLY for holes that are (or to be) firestopped.

So here again we are caught with the "when was the hosue built" problem and "what code was it under when it was built".
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