Control Panel wiring questions

[petersonra]

.
i've done a fair bit of control work, and i've used #14 MTW for control circuits, pulled
in conduit.

i've also seen an awful lot of #16 MTW pulled in raceways for pilot duty. it's not legal,
but it gets done a lot, factories being what they are, and changes made in systems
that will never get inspected by anyone, ever.

Pilot duty = class 1 circuit

 

[Besoeker]

1. Is there a minimum wire size I can use?

Is the panel for a customer? If so, they may have a minimum wire size specificatiion.