Nm Wire Run Through Residential Attics

Normally the cables carry 10 12 or 14 gauge conducting wires for individual house circuits.

Nm wire run through residential attics.

Wiring methods type nm wire support type nm nonmetallic cable shall be secured at intervals not exceeding 1 4 m 4 5 and within 300 mm 12inches of each box. Snip all the white neutral wires to the same length 6 in. There should be no excess wire or ends left in the attic. You simply mount a small plastic clip to every other joist.

Nm cable is simply a bundle of individual conducting wires wrapped in a plastic vinyl outer sheathing. If a lot of wires are already hanging from the bottom of the floor joists you can run the wires through raceways that fasten to the bottom of the joists. However if a single gang device box without. Nec 336 18 and 370 17 type nm nonmetallic cable shall be secured at intervals not exceeding 4 1 2 feet and within 12 inches of each box.

Also if they re run in an attic space above the insulation then they would also be adjusted for the attic ambient temperature. It could be installed exposed in a residential garage or in an attic or basement. Step 8 locate the wires at the sites where you fed them to from the attic and complete your connections first then secure or conceal the rest of the wire. In most cases the nm cable must closely follow the building surface or another means of support for the cable must be provided.

Many basements attics and storage areas do not have drywall applied so the trusses joists or framing members are left exposed. Nm cable also commonly known by the common trade name romex is the most common form of electrical wire. Once you are running the wire feed both ends of the wire through their corresponding holes and climb down from the attic. Section 333 12 requires where run across the top of floor joists meaning the attic floor joists the cable shall be protected by substantial guard strips that are at least as high as the cable this is a performance requirement because you are not told how to do it just that you must do it.

Any nm cables bundled together for more than 24 will require an ampacity adjustment.