Type Nm Cable Must Be Supported Within

6 the nec requires at least of free conductor in electrical device boxes for connection to switches and receptacles.

Type nm cable must be supported within.

And within 12 inches of every outlet box junction box cabinet or fitting. 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. Nm cable must be supported and secured every 4 ft. Runs of nm cable must be supported at least every 54 inches.

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. Nm is normally used in one and two family dwellings and certain multifamily dwellings. Type nm cable may not be used in any building of four or more stories.

General cable support. 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. 314 17 c states that cables must be secured to the receptacle box. Nm b is what you will see when shopping for nm cable which is rated for 90 degrees c 194 degrees f.

Type nm cable in all buildings 3 stories or less prohibits type nm cable in buildings of 4 or more stories. There are many different ways to wire a dwelling during initial construction using nm cable. 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. The nm cable must be supported within not more than 4 feet of the fixture according to 334 30 b.

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

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.