Need help on contactor and shunt trip

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meangene

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I was told told today that i had to interlock hvac air handlers to exhaust fans on the roof. and shunt trip and outlet. I need to know how to wire a shunt trip breaker properly and need to make sure I have the right size transformer ( va) to hold coil close for 7 contactors 3 which are 3 phase and 4 single phase. Can anybody please help. i have final inspection tuesday
 
meangene said:
I was told told today that i had to interlock hvac air handlers to exhaust fans on the roof. and shunt trip and outlet. I need to know how to wire a shunt trip breaker properly and need to make sure I have the right size transformer ( va) to hold coil close for 7 contactors 3 which are 3 phase and 4 single phase. Can anybody please help. i have final inspection tuesday
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It is done by fan shutdown relays tied into an approved by the fire marshals fire alarm drawings good luck getting them approved by tues. Unless you are talking about a commercial kitchen where shunt trip shuts off cooking equipment as this is the same animal yet different equipment good luck getting the aproval from fm by tues.
 
meangene said:
Can anybody please help. i have final inspection tuesday
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I've wired quite a few commercial kitchen systems, both new installations and retrofits. Every system is different, and there's no one way to wire them. It can take me up to an hour to make a wiring diagram.

I'd need to know exactly how each component of the system is presently wired, what you have to add, and the exact operational requirements. The best and most honest response I can give you is:

1. You must find someone local who understands and has done this kind of work before. I'd have to look at how everything is wired now in order to determine how to interconnect the equipment.

2. You should call and postpone the inspection until you have gotten the system wired properly and tested. If I had everything I need on site, it could take a whole day to wire a complicated system.
 
I am going to assume you have already installed the wrong breakers and the new ones are going to require another space in the panel for every breaker involved..the real key is what is going to operated the shunt trip..these can be wired several ways like Larry says and the configurations are quite different..if you are going to de-energize coils by a remote means would increase the complexity of the method..you are going to need more in depth detail of the job and maybe some pics of the equipment and working area..this is a design issue and might almost be on the edge of the type of advice we are allowed here..
 
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