Wiring Garage, Safe to go through 7 2x4s?

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Old 08-06-17, 11:06 AM
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Wiring Garage, Safe to go through 7 2x4s?

I am wiring up my garage. I have to drill through 6 2x4s are that right next each other to get to where I want a plug. Should I have no problem drilling through it? I don't think I have anything long enough to drill through it from both sides.

Its an attached garage.

Also, what is that black? It is only on part of the wall.

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Old 08-06-17, 11:16 AM
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Drilling through studs is easier if your use an auger bit. They have a screw thread on the end that pulls the bit into the wood. You will need a drill with a fair amount of torque so a drill on a low speed is best. Cordless will work but you will go through batteries pretty fast.

I recommend Dare Devil bits from Bosch 3/4 - 7/8" in size. They are inexpensive and work well. You can also use a 1/4" extension to get through the 6 studs.

The black stuff looks like tar paper to me.
 
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Old 08-06-17, 11:31 AM
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R 602.6 allow holes in consecutive load bearing studs up to 40% of depth. For a single wire you will have no issues. The black is probably asphalt impregnated sheathing, sometimes called blackjack or buffalo board.
 
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Old 08-06-17, 12:10 PM
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I would like an opinion from X on the following concern of mine:

The 6 studs look like a post or a column holding up significant weight, probably a large beam.

It is not permitted to bore through a post or column AFAIK (one cable might be ok or notch it).

boring is not permitted in more than 2 successive doubled studs
602.6 does not get into boring posts or columns other than the quote above.
 
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Old 08-06-17, 12:28 PM
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As I understand it, the key is staying under 40% on consecutive members. And it specifies ANY stud in load bearing walls. Wood columns like what is pictured are consecutive studs. All studs in a 24" span are consecutive studs... even though they may not be touching.

Over 40% up to a maximum of 60% and then it's permitted on only 2 consecutive.

An example would be an electrician drilling through king and double trimmer studs... permitted as long as the boring is under 40% but not permitted if over 40%.
 
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Old 08-07-17, 07:28 AM
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I'd probably go up and over just to avoid the PITA of running the drill through that and getting the auger all twisted up in the 1000 nails they would have shot in those studs.
 
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Old 08-07-17, 08:04 AM
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Up and over is definitely the way to go.
 
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Old 08-07-17, 10:42 AM
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The black is probably asphalt impregnated sheathing, sometimes called blackjack or buffalo board.
New terms to me, I always heard that inexpensive sheathing referred to as Blackboard or just Celotex Board. In the '50s, '60s and '70s this was a very common sheathing.
 
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Old 08-07-17, 05:19 PM
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So im thinking of going to external conduit around the beam, then back inside the wall.

Or, just go external conduit the rest of the way. I need a plug over on that part of the garage for a kegerator.
 
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Old 08-07-17, 06:32 PM
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Why not surface mount conduit the whole way?
 
 

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