The difference between the two is pretty straightforward, right? To put it simply a THW Cable does not have a nylon coating whereas a THWN is reinforced with a nylon coating. So, logically, the only difference between THW and THWN is the nylon coating. As you can see, the difference between THW and THWN is the ‘N’ which stands for Nylon-coated. Basically, THWN stands for, Thermoplastic Heat and Water-resistant Nylon-coated wire. The difficulty in differentiating the two electrical wires is quite understandable considering that they share a lot of similarities. Most people often find it difficult to differentiate between a THW wire and a THWN-type Wire. What is the difference between THW and THWN Wire? The image below will give you a comprehensive overview of everything you need to know including THW wire sizes and the insulation thickness of any THW copper wire that you might want to buy Ģ. For instance, the THW- 2 wire is specifically suited for general wiring applications associated with feeders, conduits or any other raceway services and branch circuits. What are some of those ground wiring situations? Well, some common general ground wiring situations that call for the use of solid THWs include CATV installations and swimming pool pumps.Īlso, it is important to note that like most electrical wires and cables THW wires are not one-fits-all. Still, for general ground wiring, it is always advisable to use a solid THW wire. Fortunately, by the time you finish going through this selection manual, you will have learned everything you need to know for free.Īs I indicated earlier, the THW wire is suitable for universal wiring, machine tool wiring and internal wiring of various electrical appliances. It is important to understand the differences before selecting an appropriate electrical wire otherwise you may choose the wrong wire. Nonetheless, each wire is designed to suit certain specific wiring needs. This confusion arises because the aforementioned electrical cables share a lot of similarities. More specifically, most people find it difficult to differentiate between THW Wire, THWN, and THHN electrical wires. Like most electrical cables and wires, it is often difficult to distinguish between this type of wire and electrical wires of the same nature. Currently, the National Fire Protection Association is the governing standard for any type of THW Cable or wire. Generally, this type of electrical wire is used in building wiring, feeders and branch circuits as well as internal secondary industrial distribution. THW is an acronym that stands for Thermoplastic Heat and Water-resistant Wire. Do you intend to perform any form of general purpose wiring? There is a significant chance that a THW Wire is the most ideal option for your wiring needs.
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