Electrical Wire: THHN vs THWN vs XHHW
THHN, THWN, and XHHW are common building wires, differing in terms of insulation, temperature ratings, and application scenarios:
THHN: It features thermoplastic insulation with a nylon outer layer. It has a temperature rating of 90 ° C in dry conditions and is resistant to oil and heat. It is used in conduits, household appliances, and mechanical equipment.
THWN: It has the same structure as THHN but with water resistance. It is rated at 90°C in dry conditions and 75°C in wet conditions, and can be used interchangeably with THHN in most cases. THWN-2 has a rating of 90°C in both dry and wet conditions.
XHHW: It is equipped with cross-linked polyethylene (XLPE) insulation. It has a temperature rating of 90°C in both dry and wet conditions and offers excellent resistance to heat and chemicals. XHHW-2 is rated at 150 ° C in dry conditions and 90 ° C in wet conditions, designed for high-temperature industrial applications.
Key Differences: THHN/THWN use PVC/nylon insulation (with THWN having additional water resistance); XHHW uses XLPE insulation (more suitable for high-temperature and chemical exposure environments). THWN highlights flexibility and durability; XHHW is ideal for harsh environments.
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