Commercial kitchen Hood question.

[hillbilly1]

Chic-fil-a is probably the cleanest fast food restaurant I’ve worked in, but you still have to wear restaurant shoes in the back, or you will bust your butt! The worst restaurant I’ve been in was a really old IHOP just outside downtown Atlanta. Pancake batter baked on all of the equipment. Looked like it had been on there years!

 

[djd]

I'm not familiar with commercial kitchens too much. I had a service call today . Inside of a commercial kitchen all the vapor proof fixtures under the hood had water in them and needed to be replaced.
I couldn't find any switch to shut off the lighting circuit anywhere. I took one fixture off live and I put my tracer on and traced it to a panel. Found the breaker and shut it off. Only to find out and confuse the hell out of myself I didn't know that there's some kind of system that when somebody pulls the pull station, the hood fan stays on and all the power underneath that hood even if it's equipment on the ground gets shut off.
So when I shut off that breaker all the equipment shut off with it. My first question is how do I just get the lights off and my second question is what did I shut off. Last question is if I shut that circuit off again to replace the rest of the lights that we got the parts for today is that going to cause any issue. Planning on doing it when they are closing so if I have to I can shut that breaker and the equipment being off won't be a problem.

Those lights would be tied in with the ansul system , fire suppression see any on the side , this one may of not had one .

 

[romex jockey]

The fact that everything went down and the fan came on seems to indicate OP's unit uses relays/contactors to shut down the equipment under hood. Some may prefer to use shunt trip breakers but there is more than one way to do this.

yes, indicative of a control panel w/contactors kwired.

However, inasmuch as you'll find most controllers address the hood, hood fans, hood lights, and have a termination for the gas valve , they do not address what appliances are under it

the term strips will usually incorporate a place to patch in what could be either a shunt or contactor controlled sub panel


~RJ~

 

[kwired]

yes, indicative of a control panel w/contactors kwired.

However, inasmuch as you'll find most controllers address the hood, hood fans, hood lights, and have a termination for the gas valve , they do not address what appliances are under it

the term strips will usually incorporate a place to patch in what could be either a shunt or contactor controlled sub panel


~RJ~

That may be very likely for a packaged listed control box. There are field built control boxes that just have contactors powered by the NO(HC) contact of the fire suppression system to open power to items under hood, and a contactor supplied by NC(HO) contact to turn fan on when system is discharged. That is basically all I ever run into if not using a shunt trip breaker to disable appliances under the hood.