Contractors often use these wires to connect electrical panels to appliances and lights. Romex® cables typically consist of multiple THHN wires bundled together and sheathed in polyvinyl chloride (PVC), making them suitable for indoor applications such as garages, interior walls and surface wiring above ground. However, you should only use the name Romex® to refer to Southwire’s cables with the Romex® brand name. Many electricians and consumers also use the name “Romex®” generically to mean any wire that is NM-sheathed - similarly to how some people erroneously use “Kleenex” to mean any brand of facial tissue. Romex® is also called SIMpull®, another Southerwire trademark that refers specifically to their jacketing, which makes pulling wire through conduit much easier. The “NM-B” code refers to the wire’s nonmetallic (NM) sheath and primary use in branch (B) wiring. Romex® is a product from Southwire, a reputable cable and wire provider. This wide-reaching wire, which can be bought in many different sizes and configurations, features a distinctive jacket that allows it to be pulled easily through conduit. Romex® is an electrical cable suitable for various indoor wiring uses, primarily for small businesses and homes. This guide explains the differences between THHN wire and Romex®. To understand which wire is best for your project, you must know the capabilities of each wire type. However, there are notable differences between the two. THHN and Romex® are two of the most commonly used types of electrical wire.
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