![]() However, it usually has thicker insulation than THHN models. An XHHW cable generally has a single conductor. Cross-Linked Polyethylene High-Heat and Water-Resistant Wire (XHHW)Ī type of wire size for commercial and industrial use.It usually has non-metallic sheathing used for branch wiring. With THWN, you can take advantage of high water resistance, allowing the wire to resist temperatures of up to 167 degrees Fahrenheit (75 degrees Celsius) when wet.Ĭommonly known by its trade name Romex, a residential service will generally use this type of wire for a 400-amp electrical panel. The THWN wire has similar traits as a THHN cable, except for the focused resistance. Thermoplastic High-Water-Resistance Nylon-Coated (THWN).As its name implies, its high heat and oil resistance can make it a suitable choice in a diagram with various appliances and types of machinery. Thermoplastic High-Heat-Resistant Nylon-Coated (THHN)Ī single conductor wire is commonly used in different buildings.The four kinds of cable sizes for 400 amps to watch out for are the following: Each classification has its unique pros and cons. Wire types typically fall under four categories. Doing so helps reduce the risks of issues for the panel, the circuit, and the connected devices. Understanding the different wire types available for a 400a service is vital. ![]() Factors to Consider for Wire Size Selection.Requirements to Choose the Right Wire Size for 400-Amp Service
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