Sanity check on wire gauge & molex connectors
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extending the wires from my 600w power supply (24v, 24amp) connected to my duet controller board & expansion board, and I've got some of these connectors sitting around: https://www.mcmaster.com/69295K82 (molex style pin connectors rated for 250v ac, 14amp), would it be safe to run 24v, 25amps (max output, worst case) through them, assuming the wiring is 14gauge stranded?
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You should limit the current through them to their 14A rating.