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Why is it suggested to use the outer 2 poles for switching DC voltages?

Wiring requirements for DC rated safety switches will be marked on the wiring diagram of the switch. The markings indicate the manner of wiring used in the UL testing of the switch. The switch should only be wired in the same manner that it was tested. Not all switches will state to use the outer poles for DC applications. You should ALWAYS refer to the switch wiring diagram for appropriate wiring methods applicable.

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