Romex Wire is Actually Made With THHN Conductorsgahzly
Romex is a type of electrical wire that’s mostly used in homes and buildings. The term electrical wire is just more broad and used in the electrical field. There are a few different types of wire in that field like Romex, UFB cable and THHN wire.
THHN wire is a one conductor bare copper wire with a PVC jacket and nylon coating. The most popular awg sizes from my experience are THHN 12 and THHN 4/0. The PVC jacket is the cheapest type of insulation because it doesn’t need any more than that. The nylon coating is for moisture protection and it has a small amount of lubrication for easier installation in conduit. THHN wire can be used indoors, outdoors or in conduit. It cannot be used directly in the ground. Many people ask to use THHN wire as dog fence wire and it doesn’t work.
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