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Old 09-12-2012, 09:43 AM   #1
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Conduit and masonry ceiling


I am rewiring the lighting in a part of my basement which was an addition to the house and has a masonry ceiling. It seems as if they laid conduit in the masonry, but it is impossible to find the opening without some serious demolition I am not willing to do.

As an alternative, I would like to run some conduit along the surface of the ceiling. I have never worked with conduit before. I would be running nmd90 romex, so this would be just for mechanical protection. I will use fluorescent fixtures with integrated junction boxes to make the connections.

Any suggestions on type of conduit, what is required for entrance/exit of the cable into the conduit, etc? Sorry for such a broad question... just looking for a place to start.

Thanks!

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Old 09-12-2012, 10:20 AM   #2
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Conduit and masonry ceiling


Go with PVC quite easy to install.

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Old 09-12-2012, 11:11 AM   #3
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Conduit and masonry ceiling


I was thinking about PVC, but am worried about having to bend it where it comes off the ceiling to enter a box/light.

I am using fluorescent wraps where the 1/2" knockout on the ends is not right at the top (ceiling side) of the light.

Any thoughts?
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Old 09-12-2012, 12:15 PM   #4
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Conduit and masonry ceiling


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Originally Posted by zubor View Post
I was thinking about PVC, but am worried about having to bend it where it comes off the ceiling to enter a box/light.

I am using fluorescent wraps where the 1/2" knockout on the ends is not right at the top (ceiling side) of the light.

Any thoughts?
Well get a hole-saw and make a knockout where you need it, goin to be a lot easier that bending an exact off-set. And PVC is quite flexible so if it's a drop off it won't be an issue.
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Old 09-12-2012, 12:37 PM   #5
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Conduit and masonry ceiling


I could do that!!!

What is the proper way to connect the conduit to the 1/2" knockout and clamp the NM cable inside as it exits the conduit into the fixture?

Are there any requirements for the point of entry of NM cable into the conduit?
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Old 09-12-2012, 12:44 PM   #6
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Conduit and masonry ceiling


What kind of protection do yo need on a ceiling? Just run the NMD90.
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Old 09-12-2012, 12:52 PM   #7
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Conduit and masonry ceiling


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What kind of protection do yo need on a ceiling? Just run the NMD90.
It is > 1.5 m above the floor so exempt from 12-518 in the CEC.

I guess it's just piece of mind... high traffic area that I carry lots of equipment through and the ceiling is only 6.5 ft high
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Old 09-12-2012, 03:08 PM   #8
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Conduit and masonry ceiling


Use bx and clip it nice
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Old 09-12-2012, 03:12 PM   #9
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Use bx and clip it nice
Then I need to run BX all the way from the panel, or transition from NM to BX in a box somewhere.

From the panel most of the way to the light it is wooded joists. It's only a small addition at the very end of the run where the cable needs protection.
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Old 09-12-2012, 03:29 PM   #10
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Conduit and masonry ceiling


You can run right from the panel or transition wherever you like in a box.
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Old 09-12-2012, 07:03 PM   #11
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Conduit and masonry ceiling


Use minerelac (sp?) hangers and run the pipe in a straight line into the ko. No offset needed as the pipe will be off the surface by the right amount already.

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