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-   -   how many wires through a hole (http://www.diychatroom.com/f18/how-many-wires-through-hole-22953/)

ugabulldog 06-29-2008 06:51 PM

how many wires through a hole
 
How many wires (romex) are you allowed to pull through a hole in the top plate? Thanks

Speedy Petey 06-29-2008 08:45 PM

Oh boy. Contentious issue.

Let's just say up to four cables (#14 thru #10) and you are clear of any derating issues that would restrict you.

To those thinking it, I know less than this requires derating, but not so much that it would require any action such as down sizing breakers or upsizing wire.

ugabulldog 06-29-2008 09:05 PM

I have three #12 wires, just making sure I didn't need to drill another hole and re-pull wire.

CowboyAndy 06-30-2008 08:39 AM

Petey, does the size of the hole matter? I mean really, 4 10-2 cables through a 1/2 in hole aint happpenin physically, but if you could get them through, it wouldnt be a problem? This is one area I REALLY need to learn more about...

BigJimmy 06-30-2008 02:08 PM

Quote:

Originally Posted by CowboyAndy (Post 134741)
Petey, does the size of the hole matter?

Most male electricians would say yes, while most woman electricians would disagree.

Sorry-There was NO WAY that I could resist!

Speedy Petey 06-30-2008 03:15 PM

Since Jimmy already stole the joke I'll have to give the serious answer. :(

No, there is no restriction as to hole size. Other than building codes that is.
The NEC does not care what size hole you drill.

HouseHelper 06-30-2008 03:35 PM

Quote:

Originally Posted by Speedy Petey (Post 134879)
No, there is no restriction as to hole size. Other than building codes that is.

Just ask any plumber!:yes:

jimmy21 07-03-2008 12:47 AM

if you can physically fit it in a hole, your fine. Unless your talking about boring a 2 inch hole and running half your houses circuits through it, then youll get called on it

Speedy Petey 07-03-2008 06:36 AM

Quote:

Originally Posted by jimmy21 (Post 135591)
if you can physically fit it in a hole, your fine. Unless your talking about boring a 2 inch hole and running half your houses circuits through it, then youll get called on it

Oh really? I have some certain text that says different.

jimmy21 07-03-2008 06:18 PM

Quote:

Originally Posted by Speedy Petey (Post 135616)
Oh really? I have some certain text that says different.

technically your supposed to de-rate, but an inspector would be getting really nitpicky and i've never been called on it, or even have it be an issue. I did work with someone who would bore 2 inch holes all the way down a house, like i was saying and run like 10 12-2 through it, and the inspector really didn't like that

Speedy Petey 07-03-2008 09:30 PM

Hey, I've never been called on it either, and I DID work for guys who would do just what you describe.
I just do what is right and I don't have to worry about it at all. If I do get called I like to know the code so I can either defend myself if I know I am right, or get red faced if I make a mistake.

chris75 07-03-2008 11:09 PM

Quote:

Originally Posted by CowboyAndy (Post 134741)
Petey, does the size of the hole matter? I mean really, 4 10-2 cables through a 1/2 in hole aint happpenin physically, but if you could get them through, it wouldnt be a problem? This is one area I REALLY need to learn more about...


The only problem is when you fire- or draft-stopped the hole, then 334.80 kicks in, of course this is only for type NM cables.

$J0 07-04-2008 11:39 AM

Quote:

Originally Posted by ugabulldog (Post 134643)
I have three #12 wires, just making sure I didn't need to drill another hole and re-pull wire.

Put all in same hole. 7/8" would be fine. Too many wires in too small of a hole causes heat. Form of "bunching"

Stavop 07-04-2008 09:07 PM

Derating is basically reducing the current carrying capacity of the wire because it will be subjected to too much heat right?

If you have to yank them through and risk damaging the outer jacket of the romex drill another hole.

Is there a code for this guys? I am an industrial/ commercial guy? Does the AHJ determine this ever?

Speedy Petey 07-04-2008 09:53 PM

Quote:

Originally Posted by Stavop (Post 136092)
Is there a code for this guys?

Yes. It's all in Art. 334.


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