Running of cable between boxes and fittings (see Appendices B and G)
1) Where the cable is run between boxes and fittings, it shall be supported by straps, Type 2S or 21S cable ties, or other devices located
a) within 300 mm of every box or fitting; and
b) at intervals of not more than 1.5 m throughout the run.
2) Cables run through holes in joists or studs shall be considered to be supported.
3) Notwithstanding Subrules 1) and 2), where the cable is run as concealed wiring such that it is impracticable to support it, and where metal sheeting or cladding, metal joists, metal top or bottom plates, or metal studs are not used, the cable shall be permitted to be fished and need not be supported between boxes and fittings.
4) Notwithstanding Subrule 1) a), where cable is run to a switch or a receptacle with an integral enclosure incorporating an integral cable clamp, the cable shall be supported by straps, Type 2S or 21S cable ties, or other devices located within 300 mm of the switch or receptacle wall opening, and there shall be at least a 300 mm loop of unbroken cable or 150 mm of a cable end available on the interior side of the finished wall to permit replacement.
Source: Rule 12-510, CSA C22.1:21, Canadian Electrical Code, Part 1 (25th Edition), Safety Standard for Electrical Installations. © 2021 Canadian Standards Association. Please visit store.csagroup.org