Type Nm Cable Must Be Supported Within

Where nonmetallic cable is installed horizontally through holes or notches in framing members it is considered supported and not required to be secured.

Type nm cable must be supported within.

Type nm cable in all buildings 3 stories or less prohibits type nm cable in buildings of 4 or more stories. Nm cable must be supported and secured every 4 ft. When used as a branch circuit or feeder type se cable must be supported and secured in accordance with 334 30 at intervals not exceeding 4 feet and within 1 foot of every outlet box junction box cabinet or fitting. Although in article 314 17 c s exception nonmetallic boxes have no cable clamps and must have cables supported within eight inches of the junction box.

314 17 c states that cables must be secured to the receptacle box. Nonmetallic sheathed cable shall be supported and secured by staples cable ties straps hangers or similar fittings designed and installed so as not to damage the cable at intervals not exceeding 1 4 m 4 ft and within 300 mm 12 in of every outlet box junction box cabinet or fitting. Nm is normally used in one and two family dwellings and certain multifamily dwellings. They also must be secured within 12 inches of an electrical box that includes a cable clamp or within eight inches of a box or enclosure without a cable clamp.

And within 12 inches of every outlet box junction box cabinet or fitting. Nm b is what you will see when shopping for nm cable which is rated for 90 degrees c 194 degrees f. Section 338 10 b permits type se cable as branch circuits or feeders and contains multiple installation requirements. Type nm cable may not be used in any building of four or more stories.

Type mc cable of sizes 14 12 and 10 awg must be secured within 12 from every box and then must be supported at intervals not exceeding. The nm cable must be supported within not more than 4 feet of the fixture according to 334 30 b. General cable support. However if this accessible ceiling is an occupancy other than one and two family and multifamily dwellings 334 12 a 2 does not permit the use of exposed type nm cable.

There are many different ways to wire a dwelling during initial construction using nm cable. Section 1201 2 of the icc ec 2001 supplement modifies the nec 1999 provisions to allow type nm cable in 4 story apartment buildings. The most common type of nm used are 2 wire and 3 wire. Keep in mind that support does not always mean fastening the cable to framing.

Runs of nm cable must be supported at least every 54 inches.