can the wiring for a shunt trip breaker run in separate conduit from same panel ? or must they run in separate conduit?
Agreed: separate conduit or separate conduit? :?
Commercial kitchen fire-suppression systems, for example.
Yes, the conductors may be run with other power conductors.
As an aside, most shunt-trip breakers can not withstand continuous coil energization. If the tripping current comes from a circuit supplied by the shunt-trip breaker, it will automatically be protected.
I think the actual question is: MAY they be run with CCC, or MUST they be run with CCC. The only shunt-trip breakers I worked on were in the cabinets of the equipment controlling them, so I never gave that issue much thought.
Control wiring is permitted to tap into the controlled wiring. A fuse can always be added. I'd have to know your specific situation.Larry, how would you provide OCP for the control wiring if the shunt trip breaker has a 60-amp rating for OCP?
Again, I'd have to know about your installation to answer more.Then, do you make any attempt to prevent the control wiring circuit from becoming de-energized and useless for operating the shunt trip?
Control wiring is permitted to tap into the controlled wiring. A fuse can always be added. I'd have to know your specific situation.
Again, I'd have to know about your installation to answer more.
If you need to be that sure, then use a contactor instead, wired so it drops out under emergency conditions.
To me, it is a big deal. Unless there are already shunt-trip breakers installed (I wire both existing and new systems), I usually install contactors for appliances.Agreed, so ...
Kitchen equipment being left on after the shut down button is depressed is ... no big deal?
+1 (when I was workingTo me, it is a big deal. Unless there are already shunt-trip breakers installed (I wire both existing and new systems), I usually install contactors for appliances.
Failing to energize is less of a hazard than failing to de-energize to me.
Agreed, so ...
Kitchen equipment being left on after the shut down button is depressed is ... no big deal?
A gas station E-Stop does not work because the shunt trip control circuit dropped out (yes I've seen people use shunt trips for this)?
Personally I generally don't like to use shunt trip breakers for e-stops or critical got to shut it down equipment.
As observed elsewhere here, not coming on when wanted is better than not going off when needed.
Or any other class 1 control circuit is acceptable to run in same conduit.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
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.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?