Shunt-trip breakers need a voltage applied to trip. Contactors need to lose power to 'trip.'
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Shunt-trip breakers need a voltage applied to trip. Contactors need to lose power to 'trip.'
PM sent.
What is the setup? I've seen contactors, I've seen shunt trip breakers for kitchen equipment, but never both on the same equipment.
Oops! I should have PM'ed the OP.You did not tell me anything I did not already know. I was trying to clarify exactly what the OP's intentions are. Makes no sense to use both methods at same time. He mentions both in the OP.
Usually, the exhaust must come on, and the MU off along with the appliances.Was going to use the contactor so the MUA would come on when exhaust was switched on.
The ones I wire almost always provide a pair of SPDT microswitches. If there is a prewired panel, you just connect everything to it.Most Fire suppression systems give you the choice of N/O or N/C contacts, so either electrically held contactors or shunt trip breakers can be used.
It is a violation to install a contactor in an electrical panel. Its a 20 x 48 120/208 panel with plenty of room at bottom. If not a violation would this be a bad practice for other reasons? Wiring it to a shunt trip for kitchen.
The ones I wire almost always provide a pair of SPDT microswitches. If there is a prewired panel, you just connect everything to it.
I've found using many pre-wired panels to be almost as complicated to wire as scratch-wired systems.
Likewise, I don't know of any Code article that prohibits itYou would not be putting a contactor in a 'panel' you would be putting the contactor in a cabinet that also contains a panel. In my opinion there is nothing in Article 312 that prohibits it.
Is it 'bad practice'? Certainly some will think so, I personally do not see a problem.