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Article 300 contains the general requirements for all wiring methods included in the NEC. However, this Article does not apply to signal and communications systems as covered in Chapters 7 and 8. This Article is primarily concerned about how you install, route, splice, protect, and secure conductors and raceways.
According to NEC Article 330.30, MC cable must be supported and secured at intervals of 6 feet or less (unless routed through a framing member) and cables containing four or fewer conductors sized no larger than 10 AWG must be secured within 12 inches of every termination.
The rules for securing and supporting Type MC cable can be found in Section 330.30 of the Code. Type MC cable must be supported and secured by staples, cable ties, straps, hangers, or similar fittings, designed and installed so as not to damage the cable.
Yes, cable ties are permitted.
(3) Not more than 20 current-carrying conductors are bundled, stacked, or supported on “bridle rings.” A 60 percent adjustment factor shall be applied where the current-carrying conductors in these cables that are stacked or bundled longer than 600 mm (24 in.) without maintaining spacing exceeds 20.
you can tie wire FMC and MC to emt I would think if your going to stap it like that you have chosen a path for your home runs and you have built it in a way that you have planned for the extra weight. If you have a pipe run that just runs from point a to point b with min strapping you can not strap to it.
Although the Hazardous Locations section of NEC Chapter 5 requires threaded rigid conduit (RMC) or threaded steel intermediate conduit (IMC) for the real hardcore hazardous (classified) locations, MC cable is allowed in some installations with some listing restrictions.
Type AC cable is approved by the NEC for use only in dry locations. In order to comply with the NEC for use in wet locations, interlocked Type MC Cable must have a corrosion resistant jacket and wet location rated conductors. A common style cable that is rated for wet locations is a standard MC Cable with a PVC jacket.
MC in PVC in a slab on grade is a violation. It may not be a violation. Section 330.10(11) that you quoted states when it is allowed.
Yes, NM cable can be in conduit. In fact. NEC calls for it to be in conduit, when protection from physical damage is required.
The National Electrical Code has specific regulations for how many conductor wires can fit within a conduit of each diameter size: 1/2-inch Conduit: Up to 9 of the 12-gauge wires. 1/2-inch Conduit: Up to 12 of the 14-gauge wires. 3/4-inch Conduit: Up to 16 of the 12-gauge wires.
Allowable Conduit Fill Capacities
|Size and Type of Conduit||14 AWG Wire||12 AWG Wire|
|1 1/2-inch EMT||84||61|
The National Electrical Code now requires No. 12 gauge wire for all residential electrical wiring. Ground fault interruptors (GFI) are now required by the National Electrical Code (NEC) in all outdoor areas. A GFI is an electronic device that supplements conventional circuit breakers or fuses.
The maximum size permitted is metric designator 155 (trade size 6).
Only the AHJ can approved the securing and supporting means. IMHO, provided that the zip tie is listed for the environment and the weight of the conduit I would not have a problem with a zip tie used to secure and support EMT.
General Cable Support Runs of NM cable must be supported at least every 54 inches. 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.
2 Answers. You can run cables across and under the joists. If you do though you must install them on running boards for protection. Typically it is just easier to drill.
Cable run parallel to rafters or joists must be stapled at approved lengths and kept back from the edges of a joist or rafter by 1 1/4″ or nailing plates will need to protect the cable. You cannot run cable over the top of joists or fastened to the bottom of rafters.
There is no limit. Some might say this is bundling, but I seriously doubt the wires are tightly grouped together for more than 24″ in this instance. As many as you can without damaging the jackets of the cables. You need to address derating issues when stuffing holes with cables.