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Intended for general purpose applications, THHN building wire is 19-strand 600V uncoated copper wire available in 4-14 gauge sizes, making it suitable for new construction or rewiring 600V applications.

Aw 3963 0802 Np28

MTW-type wire is also available in 19- and 26-strand 600V bare, annealed copper in 10-16 gauge sizes. MTW-type wire is primarily used in control cabinets, machine tool applications and appliance wiring applications. Both THHN and MTW-type wire are UL, cUL, CSA, and NEMA rated. Available in 500-foot spools, prices start at $32 for MTW-type wire. TFFN-type wire is available as 16 gauge, 26-strand, 600V, uncoated copper and is primarily used as fixture wire in dry locations. TFFN-type wire is UL approved and is $38 for a 500-foot spool.


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