THHN/THWN wire is what type of insulation?

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Multiple Choice

THHN/THWN wire is what type of insulation?

Explanation:
THHN/THWN indicates the insulation is thermoplastic. That plastic insulation is designed to handle high temperatures and remains workable for building wiring. The nylon-coated aspect is just a protective outer layer, not a different insulation type. Other materials like cross-linked polyethylene (XHHW), rubber, or fiberglass are not what THHN/THWN use, so the best description is thermoplastic-insulated wire.

THHN/THWN indicates the insulation is thermoplastic. That plastic insulation is designed to handle high temperatures and remains workable for building wiring. The nylon-coated aspect is just a protective outer layer, not a different insulation type. Other materials like cross-linked polyethylene (XHHW), rubber, or fiberglass are not what THHN/THWN use, so the best description is thermoplastic-insulated wire.

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