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-   -   Romex per holes in wooden framing (http://www.diychatroom.com/f18/romex-per-holes-wooden-framing-171255/)

Ebierley 02-06-2013 07:42 PM

Romex per holes in wooden framing
 
How many 14/2 or 12/2 romexcan you run through 3/4" holes drilled thrugh wooden framing?

Thanks,
Eric

Speedy Petey 02-06-2013 07:45 PM

You'll get conflicting answers to this, but the bottom line is you can pull up to four cables, sized #14,#12 or #10, through a bored hole before you have to worry about derating.

bobelectric 02-06-2013 07:48 PM

No derating until 24 ".

Gac66610 02-07-2013 07:06 AM

Both Speedy and bob are correct, however, in my neck of the woods my inspectors only like to see two romex per hole. (irregardless of hole size or wire size)
They don't go on the derating, they go on bundling, may want to check with your local building division before you have to re-do something.

k_buz 02-07-2013 07:28 AM

I'm curious why the building code would determine how many cables can go thru the hole. I would think the size of the hole would matter to the building dept, but not the number of cables.

Gac66610 02-07-2013 07:41 AM

I know, and have argued, but to no avail.
I am use to it now, and I tell them (jokingly), when drilling through joists I don't mind weakening the structure.

Found this on another forum, interesting read.

http://www.copper.org/applications/e...ion_report.pdf

mikegp 02-08-2013 01:06 PM

Quote:

Originally Posted by Gac66610 (Post 1111497)
(irregardless of hole size or wire size)

Irregardless is not a word. I hear people use it all the time and it would be rude to tell them in person. Since we're on a forum, I thought I'd mention it. People who realize this tend to giggle at people who use it. Kind of like saying for all intensive purposes instead of intents and purposes. :wink:

People will argue it's a word, but I avoid it anyway.

Hardway 02-08-2013 01:32 PM

No derating until 24 ".

Explain this please?
I know what is ment by derating. But not until 24 ".:huh:

Speedy Petey 02-08-2013 03:24 PM

Quote:

Originally Posted by Gac66610 (Post 1111497)
Both Speedy and bob are correct, however, in my neck of the woods my inspectors only like to see two romex per hole.

I always laugh when folks say "my inspectors like to see".
I don't give a crap what they "like" to see.
What is the code? Is it open to interpretation? THAT is what they can see, NOTHING more.

Gac66610 02-08-2013 04:16 PM

yeah, I know
But, I personally can't see pulling 4, 10-2 w/g through a 7/8" hole.
It's tough enough just getting 4, 14-2 w/g.
If we do everything to code why have inspections?


He also believes that in larger homes with more than 2 bathrooms, it should be split into two different circuits. It was only a suggestion, but that and kitchens will have the larger loads.
Maybe we should never listen to inspectors, they're not the ones that will have to fix it anyway.

I didn't realize grammar was a prerequisite of electrical work, I'll make a guess that not all of us are collage graduates. So please forgive my ignorance

Speedy Petey 02-08-2013 04:20 PM

What in the hell are you running FOUR 10/2's to in a house??

stickboy1375 02-08-2013 04:37 PM

Quote:

Originally Posted by Ebierley (Post 1111284)
How many 14/2 or 12/2 romexcan you run through 3/4" holes drilled thrugh wooden framing?

Thanks,
Eric

IF the hole isn't being firestopped, as many as you like... if it is being firestopped, then you have to be concerned about 9 current carrying conductors per hole.

As a rule of thumb, i generally stick to 3-4 cables per hole, depending on straightness of holes and other variables.

Gac66610 02-08-2013 04:42 PM

Quote:

Originally Posted by Speedy Petey (Post 1111288)
You'll get conflicting answers to this, but the bottom line is you can pull up to four cables, sized #14,#12 or #10, through a bored hole before you have to worry about derating.


2 - water heaters
1 - heat pump
60a, 30a 15kw furnace

But mainly I was going off your post

Speedy Petey 02-08-2013 04:58 PM

Quote:

Originally Posted by Gac66610 (Post 1112573)
2 - water heaters
1 - heat pump
60a, 30a 15kw furnace

But mainly I was going off your post

Ooooo. OK.

Toller 02-09-2013 06:08 PM

Quote:

Originally Posted by Hardway (Post 1112449)
No derating until 24 ".

Explain this please?
I know what is ment by derating. But not until 24 ".:huh:

I also would like an elaboration


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