Running Romex Under Floor Joists

Romex stapled under basement joists. 300 4 f is for protection against physical damage part f cables and raceways installed in shallow grooves. Jump to latest follow.

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These guys are right as per the nec about the 1 1 4 from the edge of the joists but by the cabo 1 2 family dwelling book you can drill a hole anywhere in the joist that you want as long as the hole does not come within 2 of the edge of the floor or ceiling joists and the diameter does not exceed 1 3 the depth of the joist.

Running romex under floor joists.

I wouldn t rule out stapling them under the joists and installing running boards after if there s an issue. You can drill the holes anywhere along the length of the joist first photo. Is it ok to run some wires on the underside of the floor joist and staple them to the bottom of the joists or is this not allowed per code. 1 300 4 f has zero 0 to do with the topic at hand romex running under joist.

Where in that exact quoted section 300 4 f does it say anything about running nm in a crawl space through bored holes other then needing a nail. The national electrical code which is the basis for all local building codes has specific regulations for installing electrical wires so that they are protected from damage. A favorite target of electrical inspectors is the improper use of non metallic cable nm in exposed locations such as basement foundation walls or along the face of studs and joists in unfinished framed spaces. I m planning to strap my ceiling.

The reason is wire breakage due to deflection of the joists a running board is allowed so that the nm cables are supported by a continous surface and the board helps limit deflection of the joists. Romex cables under 8 around here need a backing strip when running joist to joist without boring. Running romex under floor joists. Diameter plenty big enough for running cable.

Problem is as i have added new circuits to the panel i am running out of places to drill my holes in the floor joists to run my 12 2 romex. Updating the kitchen on the main floor basement is finished with tbar ceiling. The hole cannot be larger than one third the depth of the joist so the maximum hole size for a 2 12 joist actual size 1 1 2 x 11 1 4 in is 3 3 4 in.

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