THHN and THWN
THHN and THWN
THHN
T = Thermoplastic
HH = High Heat Resistance
N = Nylon Coated
Temp Rating: 90° C in dry locations
THWN
T = Thermoplastic
H = Heat
W = Water Resistance
N = Nylon Coated
Temp Rating: 90° C in dry locations and 75° C in wet locations
The most popular type of building wire used in construction is Thermoplastic High Heat-resistant Nylon coated (THHN) wire. THHN wire is also commonly used in machine tools, control circuits and some appliances.THHN wire is approved for up to 600V and is listed by Underwriters Laboratory (UL), as rated for 90° C (194° F) in dry and 75° C (167° F) in wet environments. THHN wire comes with a dual rating: THHN / THWN, which means it’s appropriate for both dry and wet applications.
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