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Can I use fine multi-stranded wire for the mains on the XT, DP or Freedom contactors?

We have not tested using fine multi-stranded wires with our lugs. What happens is that the wires move around as they heat and cool and the connection becomes loose (this induces arching), they then do periodic tightening which can break the strands (this also induces arching). The best solution is to use compression lugs for multi-stranded cables. For wiring cables we recommend class B or C stranding as define in the UL486 standard.