MTW CAN be used in conduit, although compared to THHN of the same AWG you are paying more for it to get extra flexibility (more strands), plus the insulation is twice as thick, which affects your fill calcs. MTW can have higher ampacities when sized per NFPA-79, but that does not apply once you leave the control panel, so you are back to NEC ampacity tables.
But more importantly IF it is a "wet" location or machine, MTW is only rated for 60C wet, even though it is rated 90C in dry. It's a little "gotcha" that got me once with an inspector. The only mention of that in the NEC is in Table 310.104(A). Where I got burned was that in my "wet" machine, I was using the 75C ampacities, but I got bounced on sizing the MTW that way since it could only be used at 60C.
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A type of hookup wire with a highly stranded bare copper conductor typically used in control cabinets, machine tool applications, and appliance wiring applications such as HVAC equipment. Wire & Cable Your Way offers a wide selection of Type MTW wire products at the best prices youll find anywhere. Applications for MTW Wires are best for use in dry locations at 90°C, or not to exceed 60°C in wet locations or where exposed to oils or coolants.
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