contactor location
- Thread starter normbac
- Start date
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LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
From what I understand, it's not permitted. You need a separate box, maybe above the ceiling. I've done that using empty stubs or the most convenient existing J-box.
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
What is the setup? I've seen contactors, I've seen shunt trip breakers for kitchen equipment, but never both on the same equipment.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Shunt-trip breakers need a voltage applied to trip. Contactors need to lose power to 'trip.'
PM sent.
PM sent.
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
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.
I'd be interested in his situation -hope he replies to your PM. I'm thinking he may need both. Like dropping a fryer if the ansul system loses power...
?
I wouldn't put it in a panel myslef - unless there's no wall space or it's a wash-down area. Only his AHJ knows for sure, I guess.
Was going to use the contactor so the MUA would come on when exhaust was switched on. Planned on energizing MUA, gas valve & hood lights load on contactor with shunt that would trip from Ansel.
There are no other receps at area that need shutdown.
Is there a better way.
TIA
hillbilly1
Senior Member
- Location
- North Georgia mountains
- Occupation
- Owner/electrical contractor
You can buy panels with the contactor built in, whole panel control or split buss, but I think that putting an aftermarket contactor in would probably violate the UL listing. 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.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Usually, the exhaust must come on, and the MU off along with the appliances.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
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.
Don't know if I explained correctly I planned on use a two pole contactor energized with two circuits one shunt and one regular cb exhaust switch could close contactor which would energize Mua gas valve hood light and exhaust fan From the microswitch I would wire it to the shunt if there was a fire the microswitch would shutdown the shunt cb which would close the gas. Mua and lights. While exhaust would keep running Am I missing something or is. This a poor design? Thanks for the help
- Location
- Massachusetts
You 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.
hillbilly1
Senior Member
- Location
- North Georgia mountains
- Occupation
- Owner/electrical contractor
I agree, and I have found with some manufactures, the shunt trip output is driven by a N/C contact on a relay, in which a power failure to the building can cause the breakers to trip due to the time lag of the relay re-opening the contact.
Likewise, I don't know of any Code article that prohibits it
(and, like Bob, I see no problem)
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