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Electrical Blog: Things To Consider When Rewiring A House - Types Of Wires - Non-Metallic (NM) cable

Non-Metallic (NM) cable, also known as Romex cable, is a type of electrical wiring commonly used in residential construction. It is made up of two or three insulated wires, typically made of copper, and a bare copper ground wire, all wrapped in a protective outer sheath made of a plastic material.

NM cable is typically used for wiring light fixtures, outlets, and switches in areas that are not exposed to moisture or other hazards. It is suitable for use in dry locations, such as inside walls, attics, and crawlspaces. The sheathing on NM cable is color-coded to indicate the size and number of wires inside, as well as the voltage rating of the cable.

The use of NM cable is regulated by building codes, which specify the types of applications and environments where it is appropriate to use. For example, in some areas, NM cable may not be used in exposed areas, such as in garages or unfinished basements, where it could be more susceptible to damage from impacts or moisture. In these situations, armored cable or conduit may be required.

It is important to use the correct type and size of NM cable for each application to ensure safe and reliable electrical connections. It is also important to ensure that the cable is properly installed and secured to prevent damage or exposure to hazards. In most cases, it is recommended to have an experienced electrician install and inspect the wiring to ensure that it is up to code and meets safety standards.

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