Normally you would have two parallel runs that are perpendicular the ceiling joists. NOTE: When dealing with engineered structural members, boring holes may not be an option. Installed to cover the area of the wiring. Screws or nails by a steel plate(s) or bushing(s), at leastġ.6 mm (1/16 in.) thick, and of appropriate length and width Where this distance cannot be maintained, theĬable or raceway shall be protected from penetration by Than 32 mm (1 1/4 in.) from the nearest edge of the wood Holes shall be bored so that the edge of the hole is not less Where a cable- or raceway-type wiring method is installed through bored holes in joists, rafters, or wood members, (A) Cables and Raceways Through Wood Members.
#Stapled roof code
National Electrical Code 2014 Chapter 3 Wiring Methods and Materials Article 300 Wiring Methodsģ00.4 Protection Against Physical Damage. You could always run the cable(s) through holes bored in sanw lumber joists, but you'll have to make sure the edge of the hole is more than 1 1/4" from the nearest edge (2" according to IRC). Where the cable is installed parallel to the sides of rafters, studs, or floor joists, neither guard strips nor running boards shall be required, and the installation shall also comply with 300.4(D). (B) Cable Installed Parallel to Framing Members. Where this space is not accessible by permanent stairs or ladders, protection shall only be required within 1.8 m (6 ft) of the nearest edge of the scuttle hole or attic entrance. Where run across the top of floor joists, or within 2.1 m (7 ft) of floor or floor joists across the face of rafters or studding, in attics and roof spaces that are accessible, the cable shall be protected by substantial guard strips that are at least as high as the cable. (A) Where Run Across the Top of Floor Joists. Type AC cables in accessible attics or roof spaces shall be installed as specified in 320.23(A) and (B). Article 320 Armored Cable: Type ACģ20.23 In Accessible Attics. The installation of cable in accessible attics or roof spaces shall also comply with 320.23. National Electrical Code Chapter 3 Wiring Methods and Materials Article 334 Nonmetallic-Sheathed Cable: Types NM, NMC, and NMSģ34.23 In Accessible Attics. If there's no permanent stairs or ladder, this protection only has to be provided to cables within 6 ft. Protecting the cable is as simple as installing " substantial guard strips", which can simply be a 1x2 furring strip on each side of the cable. If the attic is accessible by permanent stairs or ladder, any cable running across the top of joists will have to be protected. In this case, the codes definition of accessible is whether or not there's permanent stairs or a ladder. While you might call this area inaccessible because it's small, dark, and difficult to enter.
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