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Old 05-25-2018, 10:47 AM   #1
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Default Shunt trip breakers

I just want to know the ins and outs from wiring to its function thanks
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Old 05-25-2018, 11:07 AM   #2
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https://www.google.com/search?q=Shun...nt=firefox-b-1
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Old 05-25-2018, 12:55 PM   #3
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For starters there is no such thing as a shunt trip breaker, a shunt trip is an optional accessory. It is like calling a car with AC an "Air conditioning car"

A shunt trip uses an external signal to trip a breaker, that can come from a relay, a remote trip button, or many other sources. Other common optional accessories are bell alarms ,aux switches, and UV's.
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Old 05-25-2018, 01:19 PM   #4
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I just want to know the ins and outs from wiring to its function thanks
Welcome aboard @PETEYPETE!

Seems like there was already a link posted for you.
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Old 05-25-2018, 01:21 PM   #5
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For starters there is no such thing as a shunt trip breaker, a shunt trip is an optional accessory. It is like calling a car with AC an "Air conditioning car"

A shunt trip uses an external signal to trip a breaker, that can come from a relay, a remote trip button, or many other sources. Other common optional accessories are bell alarms ,aux switches, and UV's.
Having a bad day?

Terminology should be given some latitude, shunt trip breaker is pretty common in all the places I've worked.
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Old 05-25-2018, 01:48 PM   #6
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I should have been more specific. This shunt trip is for a hood in a restaurant
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Old 05-25-2018, 01:53 PM   #7
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Boiled down it's a switch to open a breaker.

The means of switching can vary in voltages and complexity.

The most experience I've has with them is EPO buttons in factories and ANSUL fire suppression systems in kitchens.

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Old 05-25-2018, 01:54 PM   #8
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I should have been more specific. This shunt trip is for a hood in a restaurant
Have your jman explain it to you on the job because a picture is worth a thousand words.
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Old 05-25-2018, 01:57 PM   #9
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I should have been more specific. This shunt trip is for a hood in a restaurant
Most modern hoods have a built in cabinet that you wire per diagram. If you are retrofitting you will have to design and install per the requirements of the AHJ. This can vary, the fire inspector will have a say in this.

Basically everything electrical under the hood should turn off when the fire local suppression system is activated, and in some cases when the fire alarm goes off.

The local make up air (supply) needs to turn off and the hood exhaust needs to turn on regardless of the switch position.

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Old 05-25-2018, 02:27 PM   #10
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Most modern hoods have a built in cabinet that you wire per diagram. If you are retrofitting you will have to design and install per the requirements of the AHJ. This can vary, the fire inspector will have a say in this.

Basically everything electrical under the hood should turn off when the fire local suppression system is activated, and in some cases when the fire alarm goes off.

The local make up air (supply) needs to turn off and the hood exhaust needs to turn on regardless of the switch position.

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Hood exhaust needs to turn on may or may not be local requirement. Makeup air definetely needs to shut off as does any electric under the hood.
Most ansul systems have dbl pole dpl throw switches in them.

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Old 05-25-2018, 03:12 PM   #11
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Hood exhaust needs to turn on may or may not be local requirement. Makeup air definetely needs to shut off as does any electric under the hood.
Most ansul systems have dbl pole dpl throw switches in them.

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True. The fire chief here didn't require us to turn off the hood lights but we did anyway.

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Old 05-25-2018, 04:54 PM   #12
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Hood exhaust needs to turn on may or may not be local requirement. Makeup air definetely needs to shut off as does any electric under the hood.
Most ansul systems have dbl pole dpl throw switches in them.

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Can't recall any location that didn't require the exhaust fan to run in a fire situation.
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Old 05-25-2018, 05:23 PM   #13
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Can't recall any location that didn't require the exhaust fan to run in a fire situation.
Ive worked on a few in Trenton, some stayed on some shut off. The big thing seemed to be the makeup air turning off as they didnt want to flame the fire by adding air.
They also looked close at any elecyric appliances and outlets turned off when system activated.
The hood lights is a good question... I cant recall any mentioning that but technically it is electric under the hood.



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Old 05-25-2018, 06:03 PM   #14
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Hoods in simple terms: On a fire event everything under the hood shuts off. Makeup air shuts off. Exhaust turns on (or stays running).

How you do that is ip to you. An easy way for big kitchens is to feed a small panel with a shunt tripped breaker that contains all the under hood equipment. Just like most things there's 10'ways to do anything. Some look ugly. Some waste time. Some waste material. Pick from the 2 or 3 that are left and don't overthink stuff.
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Old 05-25-2018, 06:16 PM   #15
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Hoods in simple terms: On a fire event everything under the hood shuts off. Makeup air shuts off. Exhaust turns on (or stays running).

How you do that is ip to you. An easy way for big kitchens is to feed a small panel with a shunt tripped breaker that contains all the under hood equipment. Just like most things there's 10'ways to do anything. Some look ugly. Some waste time. Some waste material. Pick from the 2 or 3 that are left and don't overthink stuff.
I haven't seen that in a while now, usually the hood comes with a pre-made panel these days.
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Old 05-25-2018, 09:54 PM   #16
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I haven't seen that in a while now, usually the hood comes with a pre-made panel these days.
It all depends on how the hood is speced out.

I've seen more with a subpanel just for the equipment under the hood as MD stated than having them come with a factory control panel.
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