De-rating control and signal wire

[don_resqcapt19]

Oh, but what would make either or fit a certain category?

It would likely be a Class 1 circuit as, in general, Class 2 and 3 circuits must be supplied by a listed Class 2 or 3 power supply.

 

[Smart $]

Oh, but what would make either or fit a certain category?

Perhaps the power source, voltage and overcurrent device rating, and exact purpose of that circuit. Only thing you established is that it is an engine start circuit. You are coercing us into assuming it is control or signal only circuit. But lacking the specifics leaves the possibility open that the circuit could power an electromechanical engine starter, i.e. a power circuit.