Unlike, Romex®, THHN is a generic type of wire rather than a brand name. Its capabilities and features have made it one of the most popular construction wires, and it passes the majority of building codes. The acronym means “thermoplastic high-heat nylon,” which refers to components and characteristics of the wire’s jacket and insulation. THHN is the industry’s most popular single conductor electrical wire type. The “MC” means “metal-clad” and refers to the aluminum jacket, which makes it easier to push the cable through conduit. This THHN ground means you can use this cable in conduit or outdoors because moisture cannot reach bare copper. Type MC cables: Type MC cables feature THHN wires plus an extra green THHN wire that is used as a ground.We discuss THHN wires in more detail below. Romex® cables consist of these conductor wires bundled together. THWN and THHN cables: If you only need one wire, you can choose individual thermoplastic high-heat water-resistant nylon (THWN) or thermoplastic high-heat nylon (THHN) wires.However, one notable difference is that UF-B cables have a more durable outer sheath that makes them suitable for underground and outdoor applications. Underground feeder (UF-B) cables: Underground feeder (UF-B) cables share many similarities with Romex® wires.Understanding the differences can help you decide. You may be having trouble choosing between Romex® and other common cable types. National Fire Protection Agency (NFPA) 70.Restriction of Hazardous Substances (RoHS).Registration, Evaluation, Authorization and Restriction of Chemicals (REACH).Romex® meets various standards, making it suitable for many uses. Gray jacket: Larger sizes between 8 AWG and 2 AWG. For example, 14/2 Romex® means all the wires are 14 AWG and there are two conductors. Common sizes are available in distinct colors to make identifying them easier. Sizes are labeled with a slash to show the wire size and the conductor number. Romex® wire is available with two or three conductors and in sizes from 14 American Wire Gauge (AWG) to 2 AWG.
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