The likely goal of this language is to increase safety by reducing the use of thermoplastic wiring insulation that cannot withstand the output voltages and currents from a VFD using pulse width modulation. Ultimately, thermoplastic PVC can melt and deform when exposed to heat generated by short circuits. Simply check the cable print legend or the spec sheet. If the cable is UL-listed, there should be information about the conductor insulation material available to you.
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