romex in first floor ceiling

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Old 09-13-00, 05:18 PM
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is it permissible to run romex parallel to strapping and perpendicular to the joist
 
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Old 09-13-00, 05:23 PM
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What kind of strapping is involved?
Depending on where these joists are located is how the NEC will allow you to run them perpendicularly.

 
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Old 09-13-00, 06:53 PM
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I take it you are referring to wiring between the first floor ceiling and the second floor floor. Boy thats good english!

It is allowed to run the Romex between the ceiling and the floor paralell to the joist as long as you support the Romex every 4'

It is allowed to drill or notch through the joists and run the Romex perpendicular to the joists with some rules as follows. You are only allowed to drill the joist, not a beam or manufactured truss. You are only allowed to notch a joist in the outer thirds of the joist not in the middle. You are only allowed to notch a joist on the compression side of a joist [Usually top of joist] You may drill a joist anywhere along a joist. YOu must keep a clearance of 2" from the top of bottom edge of the joist. You can only notch 1/6th the width of a joist on the compression side only. If you install a Romex within 1 1/4" of the surface of a stud, or joist then you must protect that section by a steel plate.

If you are running surface in a crawl space then the Romex must be installed on a running board instead of a clothes line effect.

Attics not used for storage Romex may be ran above the joists but must be protected if within 6' of a attic access.

Hope this helps

Wg
 
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