As long as the control voltage is 120 I see no reason the control wiring can't be run in the same conduit as the current carrying conductors. There is nothing that says they must either.
-Hal
Or any other class 1 control circuit is acceptable to run in same conduit.
Larry, how would you provide OCP for the control wiring if the shunt trip breaker has a 60-amp rating for OCP?
Then, do you make any attempt to prevent the control wiring circuit from becoming de-energized and useless for operating the shunt trip?
Good questions. supplemental overcurrent is simple, but can leave you with no power to operate the shunt trip. If you happen to have a control circuit supplied by the main circuit in some way hopefully you can use that control circuit. Should the OCPD for said control circuit be open, presumably you have no control and know there is a problem with something. Outside of that considerations become more complex.
I connected a shunt trip breaker for a CT scanner once, was like a 150 or 200 amp breaker, 480 volts. Can't recall anymore what shunt trip unit volts was, probably 120 volts though. I think shunt trip supply came from CT control unit, so it either was derived from the supply circuit or at least was same circuit that controlled things, so if control power was lost the CT wasn't operating anyway and there would have been no need to actuate the shunt trip in some emergency situation.
725.43 does have informational note that tells you a few places where a 14 AWG or larger control circuit conductor may be allowed more than a 15 amp OCPD. I am most familiar with motor control circuits - there you can have 14 AWG control circuit conductors on a 45A OCPD in some cases, or increase the control conductor to 10 AWG and it can be on 90 amp OCPD and would be compliant.
For shunt tripping cooking appliance circuits under an exhaust hood - I think you often see the exhaust hood control circuit being the shunt trip supply circuit. If the hood is not working you may not have shunt trip functionality, but with no exhaust hood they generally won't be cooking either, too many vapors that need to be extracted from the space will occur and they will take action to fix things.