Romex Wiring Code

Followed by bx also know as armor clad or flexible metal conduit and individual conductors run inside.

Romex wiring code. Electrical wiring is an electrical installation of cabling and associated devices such as switches distribution boards sockets and light fittings in a structure. The national electrical code which is the basis for all local building codes has specific regulations for installing electrical wires so that they are protected from damage. Type nm b can be produced and sold without using this color code. Wire size printed along sheathing.

This national electrical code was mainly implemented to accommodate potential future uses. The most common types of romex are rated only for indoor use and come in 14 and 12 awg wire sizes. As such the print legend which is required by the nec should be used to verify the conductor size. The wires inside the sheathing are also color coded as shown.

The coating on nmc cable is non conducting flame resistant and moisture resistant. Today residential construction primarily uses three types of wiring non metallic nm cable being the most common. Examples of electrical codes for home wiring code adoption information. The nec does however require that wire size be imprinted in the repeating data strip running along the sheathing.

Buried wiring runs that transition from underground to above ground must be protected in conduit from the required cover depth or 18 inches whichever is less to its termination point above ground or at least 8 feet above grade. Color coding makes it easy to identify wire size in the cable at a glance but the national electrical code nec does not require it. Wiring switches without a neutral wire. Nm 14 2 romex has a black insulated wire a white insulated wire and a bare ground wire all 14 gauge.

Low voltage wiring carrying no more than 30 volts must be buried at least 6 inches deep. All switch locations need a neutral wire. Romex is a common type of residential wiring that is categorized by the national electrical code nec as underground feeder uf or non metallic sheathed cable nm and nmc. Nm and nmc conductors are composed of two or more insulated conductors contained in a non metallic sheath.

The cable includes a bare ground wire wrapped in paper. Each wire entering a box and terminating or splicing therein is counted as one wire. Electronic switches require a small amount of constant electricity and therefore need a neutral wire run to them. Proper uses nm cable also commonly known by the common trade name romex is the most common form of electrical wire.

Bends is romex cable shall be made so the radius of the curve of the inner edge of the bend is not less than 5 times the diameter of the cable. It should be noted that this color coding system is not a requirement of nfpa 70 national electrical code nec or ul 719 safety standard for nonmetallic sheathed cable. Wiring is subject to safety standards for design and installation.