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Old 08-31-2012, 04:23 PM   #1
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Basement Cinderblock Wiring


I'm looking to add some more outlets to my basement. It's unfinished with cinderblock walls. Currently there's a couple outlets mounted at head level, someone nailed a 1x8 to a joist and attached NM and a box with staples. I'd like to put more outlets at the proper height, and do something that looks a little nicer.

What would be easiest? I could run NM along the rim joist (where it is now), into a jbox, and then drop down a length of conduit to an outlet. Is there any risk of water entering the box when drilling a tapcon into the foundation wall cinderblock to secure the box? During periods of heavy rain, I've occasionally had water leak from small cracks in the lower foundation. The walls are covered with drylok.

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Old 09-01-2012, 01:05 AM   #2
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Basement Cinderblock Wiring


I think conduit is going to be appropriate for this situation. It looks nice even outside the wall too IMO.

As for mounting the box, if you're worried about water getting in you could use tapcons to anchor a plaque (wood or some other material) and then secure the box to the plaque?

Good luck!

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Old 09-01-2012, 08:54 AM   #3
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Basement Cinderblock Wiring


Depending on the exact situation, it may be easier for you to make one drop down the wall and run the conduit horizontally around the area. Drop down to a box which will be your first receptacle, then come out the side with a 10' stick of 1/2" EMT, install a box at the end, then keep repeating this around the basement.

As for the water leaking thru, you can seal it so that the water won't leak into the box, but I would be worried about putting holes into a foundation if water is going to be leaking thru. I would ask this question to the people who are experts in foundations and basements. When I come in as an electrician and the customer wants me to screw into the lower part of the basement wall I always ask them what they want done and explain that I'll do it any way that they want but I won't guarantee against water leaking, and I also include that note in the contract that they sign.
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Old 09-01-2012, 11:55 AM   #4
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Basement Cinderblock Wiring


EMT CONDUIT! Any other way is just plain hack for block walls.
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Old 09-02-2012, 07:16 AM   #5
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Basement Cinderblock Wiring


How do I deal with the cinderblocks sticking out? Should I come down from the ceiling to the box, then back up along the joists to clear the blocks?
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Old 09-02-2012, 07:27 AM   #6
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Basement Cinderblock Wiring


You could do that.

In some situations I would bend around the protrusions with a 4-point saddle. But it doesn't completely hug the block and in a residential basement your kids (or their friends) will turn the pipe into a step

So I think separate drops would be best for you.
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Old 09-02-2012, 07:51 AM   #7
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Basement Cinderblock Wiring


I would not offset around those posts. Its going to look horrible. Remember, all the receptacles you install will need to be GFI protected either by a breaker, individual GFI's, or a GFI line and loaded. You will not be able to get 2 NM cables into a 1/2" EMT sleeve.
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Old 09-02-2012, 08:49 AM   #8
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Basement Cinderblock Wiring


Come down out of the ceiling. Otherwise you will have to use panduit and corners to get around those posts. As for gfci protection, depends on if your area determins that space finished as is.

If you want gfci in the loop, What I would do, is go to the expense of using breakers not outlets.
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Old 09-02-2012, 02:22 PM   #9
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Basement Cinderblock Wiring


Quote:
Originally Posted by gregzoll View Post
As for gfci protection, depends on if your area determins that space finished as is.

.
I consider the walls painted a finished area, throw an area rug down and call it good.

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