Depending on the size, it comes in either a stranded or a solid wire. It uses either aluminum or copper as the conductive material.įinally, polyvinyl chloride (PVC) wraps the conductive material and serves as insulation. THHN rates at 75☌ in a wet location or 90☌ in a dry location. Several options of this type carry a dual rating cable, which you can identify by a THHN / THWN marking. If you think about distinguishing this from other types, you will observe its PVC insulation. It is important in electrical properties to determine its amp rating.Ī negative effect of having a thin insulation layer is frequent current leaking, leading to a breakdown. When the insulation in THHN burns, it releases toxic smoke. Since this type uses nylon coating, it is not extremely flexible. It becomes an issue for some people, especially those who want to maximize saving time and energy during installation. Despite its cons, the THHN is still very popular because it is cheaper. When you plan to wire an entire building, you will want to save money whenever you can. Thermoplastic Heat and Water-resistant Nylon-coated (THWN) Having a cost-effective solution without sacrificing safety goes a long way, so several people still go for a THHN. Thermoplastic Heat and Water-resistant Nylon-coated are the least common of the two. According to the National Electrical Code, you can mostly find this type in industrial and commercial buildings. Its outer layer is tough yet easy to pull and bend. When installing it, electricians will not have a hard time bending it. It saves them time and energy in the long run. The THWN is also resistant to common chemicals, such as gasoline and moisture.
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