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Old 04-02-2010, 10:36 PM   #1
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how many cables can be run together


Hi there,

If one has several 12-2 wires running into a subpanel and out to their respective ciruits how many can be run through a single set of holes along a set of studs.

I have about 6 12-2 running in the ceiling of my basement and as I start to finish the basement and put some 2x4 walls up, I would like to move the wires from the ceiling and embedd them into the new walls. but not sure how many I am allowed to run through a single hole that gets drilled along the studs. This is not a load baring wall so size of hole is not a problem.

Thanks
Russell (Portland OR)
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Old 04-02-2010, 10:49 PM   #2
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What does the NEC manual & your local jurisdictional inspector state as the max?



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Old 04-02-2010, 11:39 PM   #3
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Review N.E.C. art.300 Wiring Methods 300.4. D
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Old 04-03-2010, 12:03 AM   #4
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I have reviewed that section and was able to find the following:

Quote:


300.17 Number and Size of Conductors in
metal conduit that terminates in the motor terminal box


Raceway


through a 90 degree angle connector. Wiring a fixture whip


prior to connecting a luminaire is also permitted by this
The number and size of conductors in any raceway shall


section.


not be more than will permit dissipation of the heat and


The exception, new for the 2005 Code, points out that


ready installation or withdrawal of the conductors without


these requirements do not apply to certain short sections of


damage to the conductors or to their insulation.


raceways used for physical protection of cables.


FPN: See the following sections of this


Code: intermediate

metal conduit, 342.22; rigid metal conduit, 344.22;
flexible metal conduit, 348.22; liquidtight flexible metal
conduit, 350.22; rigid nonmetallic conduit, 352.22; liquidtight
nonmetallic flexible conduit, 356.22; electrical
metallic tubing, 358.22; flexible metallic tubing, 360.22;
electrical nonmetallic tubing, 362.22; cellular concrete
floor raceways, 372.11; cellular metal floor raceways,
374.5; metal wireways, 376.22; nonmetallic wireways,
378.22; surface metal raceways, 386.22; surface nonmetallic
raceways, 388.22; underfloor raceways, 390.5; fixture
wire, 402.7; theaters, 520.6; signs, 600.31(C);
elevators, 620.33; audio signal processing, amplification,
and reproduction equipment, 640.23(A) and 640.24;
Class 1, Class 2, and Class 3 circuits, Article 725; fire
alarm circuits, Article 760; and optical fiber cables and
raceways, Article 770.

Listed

It seems to talk about all the different kinds fo conduit but not simply a bored hole through wood...

Russell
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Old 04-03-2010, 12:17 AM   #5
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I was referencing 2008 edition.It talks about maintaining 1 1/4 clearance from edge of stud to conductors.
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Old 04-03-2010, 12:29 AM   #6
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yes, both additions refer to edge of stud to conductor but that was not my particular question.

I was trying to understand how many 12-2NMB conductors can go through a single set of bored holes through the studs in a single grouping.

Thanks
Russell
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Old 04-03-2010, 12:37 AM   #7
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Rule of thumb is, go by what the local jurisdiction states. I personally would go no greater than 6 Romex cable, because then you are getting to the point that you are weakening the framing member by going beyond the 1/3 allowance.



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Old 04-03-2010, 12:46 AM   #8
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Quote:
Originally Posted by russellm View Post
yes, both additions refer to edge of stud to conductor but that was not my particular question.

I was trying to understand how many 12-2NMB conductors can go through a single set of bored holes through the studs in a single grouping.

Thanks
Russell
From my experince with North Americiané set up you will need to use 9/16 augar bit even 5/8 inch augar bit but nothing bigger than that and of course you will need nail plates on it and wit either 9/16 you can able fit in two cables twin 2.5 or 4.0mm˛ { 14-2 or 12-2 NM cable }

That will able slip thru without much issue.

but I know some case you can slip in three cables in that hole all it depending on what size bit you use to bore it out.

Merci,Marc
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Old 04-03-2010, 12:57 AM   #9
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thanks for the replies.

I am not too worried about weakening the framing as this is really just going to be a false 2x4 wall against a cement wall.

See pic, those cables on the joists will need to get moved to the false 2x4 wall I create against the cement wall.
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Old 04-03-2010, 01:24 AM   #10
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there is a maximum limit as to how many cables can be run together in that tight a space before you start to induce voltages but as the previous posters have said this will not be an issue and you can only drill so big a hole and still meet the 1.5" rule. Simple answer is this....drill whatever size hole you are able to without exceeding being 1.5" from the edge of the 2x4 and then put some cables in it....you might be able to fit three if your lucky.
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Old 04-03-2010, 01:33 AM   #11
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thanks. So I guess I can drill a couple of different sets of holes and that should do it.

I think I can also go closer than 1.5" if I put a steel plate in front of the hole correct?
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Old 04-03-2010, 01:39 AM   #12
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yup....shouldn't be a problem
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Old 04-03-2010, 12:01 PM   #13
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The generally accepted standard in Portland is no more than 2 wires per bored hole. I've had inspectors call a violation if there are 3 or more. We bore 7/8" holes, use nail plates as needed.
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Old 04-03-2010, 12:58 PM   #14
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thanks Jupe. I guess I will keep it to 2
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Old 04-03-2010, 02:37 PM   #15
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You will maintain more of the strength of the joist by drilling midway between the top and bottom of the wood. The neutral plane of the member is doing very little work. The top of the wood is in compression, while the bottom is in tension. You also don't want to drill too close to the end of the joist.
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Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.
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