![]() ![]() It’s also a thicker insulation that can better protect against breakdown when exposed to extreme environments. 'The “X” in XHHW (generally abbreviated as XPLE) is an insulation material that is more resistant to wet environments than THHN (90☌ vs 75☌). What is XHHW Wire?Ĭross-Linked Polyethylene High Heat-resistant Water-resistant Wire (mercifully shorthanded as XHHW) is a single conductor electrical wire used primarily for commercial and industrial building applications. Some communities do not allow the use of Romex, so be sure to check with local codes before using. Romex may also present some challenges for installation with conduit as larger conduit may be required compared to the same gauge of THHN. Sizes 14 AWG - 1000 KCMIL Copper building wire Permitted for 600-volt applications SuperSlick Elite technology Sequential Foot Markings (sizes 250 KCMIL. Romex (or other brands of NM-B cable) is not permitted in commercial applications or residences taller than three stories. There are some very critical differences when it comes to code compliance. Type THHN or THWN-2 conductors are primarily used in conduit as branch circuits in commercial or industrial applications, as specified by the National Electric. Romex is essentially multiple THHN wires together in a single PVC sheathing. We generally think of a specific type of Romex, which is known for its nonmetallic sheathing and primary use as branch wiring. Romex is often used as residential wiring for electrical circuits and lighting. When we think of Romex, we most commonly are referring to the trade name for Thermoplastic-Sheathed Cable (TPS). ![]() Temperature Rating = 90☌ (Dry), 75☌ (Wet) Temperatures up to 90☌ in wet conditions vs 75☌ for THHN. The key difference is the “W” in the name indicates water-resistance. THWN is also a single conductor wire with PVC insulation and a nylon jacket. Both of them have high heat resistance and can function adequately in temperatures us to 90C or 194F. In high heat situations, however, you would do much better going with high heat wires like THHN or THWN-2. THWN is essentially the same as THHN and the two are often used interchangeably. High Heat Situations (Above 75C or 167F) If you expect the heat to be below 75C or 167F, you can use any of these wires. Its heat and oil resistance makes THHN a suitable wire for appliances and machine tools. It’s commonly used in conduit as electrical wire for buildings. Thermoplastic High Heat-resistant Nylon-coated wire (THHN) is a single conductor wire with PVC insulation and a nylon jacket. ![]() This guide will help explain the differences and make your choice of wire more straightforward. Here we examine some of the most common of them THHN, THWN, Romex and XHHW. In the world of building wire, there are several common choices available that at first appear quite similar. Types of Electrical Wire: THHN vs THWN vs Romex vs XHHW
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