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Old 01-20-2010, 03:47 PM   #16
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Running wire under floor


is the ceiling finished?

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Old 01-20-2010, 04:48 PM   #17
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Running wire under floor


Not yet...but Getting the wires up there from the basement would be troublesome, since that wall is brick.
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Old 01-20-2010, 07:54 PM   #18
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Running wire under floor


Sheesh, guys!! He can use type UF and lay it on the slab, or fasten it at the bottom of those 2x4's. No other protection would be needed, as it then would be at least 3 inches below the floor level.

He could also sleeve it in PVC conduit, and similarly strap the PVC near the bottom edge of those 2x4's.

Edit to add: I considered 2x4's on their side to be sitting on edge? Or are these laid flat?
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Old 01-20-2010, 08:34 PM   #19
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Running wire under floor


Sch. 80 PVC counts as protection from physical damage.

You are most certainly permitted to sleeve NM cable or UF cable in conduit for protection for a short run like that, you do not need to use THWN. The conduit just has to be large enough. (Following fill rules)
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Old 01-20-2010, 09:01 PM   #20
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Running wire under floor


Laid flat or there would not be a problem.
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Old 01-20-2010, 09:18 PM   #21
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Running wire under floor


OK, laid flat. Simply install the wire or conduit in the center between the joists. There, they are not likely to be nailed into, especially once that tile is laid.

If the wire is fastened directly to the concrete, it should be far enough away from the top so that it won't need any further physical protection.
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Old 01-20-2010, 11:26 PM   #22
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Running wire under floor


Thanks for all the help. I'll run the wire in the middle, so 8" away from each joist in an 8-foot length of sch 80 conduit.

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