ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Trumpy 5
Recent Posts
What do you do?
by gfretwell. 09/24/17 12:05 PM
75 kva tranformer
by sparkync. 09/23/17 06:41 PM
Another generator question
by gfretwell. 09/23/17 04:15 PM
Supporting conduit bodies
by ghost307. 09/18/17 12:12 PM
Thermal Imaging Camera upgrade
by Potseal. 09/18/17 11:57 AM
New in the Gallery:
Gallery Test
Popular Topics(Views)
240,959 Are you busy
176,757 Re: Forum
168,603 Need opinion
Who's Online Now
0 registered members (), 77 guests, and 6 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#25196 - 04/30/03 05:52 PM shunt trip ckt bkrs  
ken m  Offline
Joined: Aug 2001
Posts: 58
south carolina
does anyone have any info regarding shunt trip ckt bkrs such as; previous posts or a wiring diagram etc. i just recently weired my first resturaunt and the fire alarm inspector says i need a shunt trip on the fresh air makup and on a recept located under the exh hood. any help would be appreciated. thx., ken m

Work Gear for Electricians and the Trades

#25197 - 04/30/03 06:07 PM Re: shunt trip ckt bkrs  
walrus  Offline
Joined: Jul 2002
Posts: 680
Bangor Me. USA
I've seen Shunt trips used for E stops in gasoline stations. They had a panic button by the cashier in case of fire etc. that when pushed sent 120v to the side terminal on a Shunt trip breaker causing the sub panel to de energize . Doesn't meet code in this application as it doesn't remove grounded conductor but...
Seems pretty simple to me, apply 120 v and it trips.

#25198 - 04/30/03 06:18 PM Re: shunt trip ckt bkrs  
txsparky  Offline
Joined: May 2001
Posts: 552
Magnolia,.Texas U.S.A.
The shunt trip breakers are pretty straight forward. They will have grounded conductor wire that attaches to the neutral and either a terminal or a pigtail for the switch leg to energize the trip coil. You will have to run a hot and switch leg to the fire suppression panel. There should be a set of contacts inside the panel ( the wires are usually hanging out of the side of panel and you can mount a j- box over them) There is usually 1 NO and 1 NC contact with a common between the two. Terminate your hot to the common and the switch leg to the NO. Whenever the fire suppression system is initiated, the contacts will close and energize the coil on the shunt trip.


#25199 - 04/30/03 06:42 PM Re: shunt trip ckt bkrs  
spyder  Offline
Joined: Oct 2002
Posts: 210
I think they are also available in 24volt. I did a restuarant a couple of years ago. We had to shunt trip the hood fan, make up air fan, and the air handlers for the heating and cooling system. We used 120v. We had to intall a relay so when the fire system was in alarm, the breakers tripped.

#25200 - 04/30/03 07:10 PM Re: shunt trip ckt bkrs  
elektrikguy  Offline
Joined: May 2002
Posts: 132
Of the resaurants that I have done this is the scoop. If the restaurant has any type of grease or fryer you will have a suppression system. The suppression system(ANSUL is popular) has contacts that are mechanically activated when handle is pulled to suppress a fire.You will need to wire the shunt trip coil in parallel with all normally open contacts. 9 times out of 10 the engineer or inspector will require that all electricity under the hood be shutdown. Now, that being said, a few of the restaurants that I have done will have the HVAC contractor supply and install a ventilation control panel. These are the "cats meow". They do multiple things for you. It would be your responsibility to wire for 2 wire control of any exhausts and intakes. The control panel allows control of all fans manually by the chef but more importantly will automatically shut down intakes and fire up the exhausts to vent the smoke if a fire alarm is activated. A FA control relay with 2 wire control will cover that. One more thing on the shunt trip breaker. If it is speced to drop an entire panel ensure that all lighting circuits are not affected. Remember that if there is more than one contol point of the shunt trip to wire in parallel. Good luck.

[This message has been edited by elektrikguy (edited 04-30-2003).]

#25201 - 04/30/03 09:23 PM Re: shunt trip ckt bkrs  
arseegee  Offline
Joined: Jan 2002
Posts: 324
Statesboro, GA USA
I just installed three shunt trip breakers this afternoon for a restaurant/bar. It trips all electrical outlets under the hood and the stage receptacles. Since it is listed as an assembly, the state requires the fire alarm to have a voice evacuation system along with strobes. So it has to kill stage power so that the evac can be heard.

I used 120v trips on my breakers. The alarm contractor brought a 24V relay with a set of N.O. dry contacts to my panels. Ran my control voltage to the common and brought a switch leg back to one of the leads on the shunt breaker. Tied the other lead to the neutral buss. Pull the alarm and out goes the band! Might come in handy if you dont like their

#25202 - 04/30/03 09:58 PM Re: shunt trip ckt bkrs  
harold endean  Offline
Joined: Feb 2002
Posts: 2,233
Boonton, NJ
I believe that shunt trip breakers are also used a lot for elevators too.

#25203 - 04/30/03 10:39 PM Re: shunt trip ckt bkrs  
elektrikguy  Offline
Joined: May 2002
Posts: 132
Yep, Shunt trip breakers are used in elevator recalls. Again the breaker is shunted when a fire alarm signal triggers a NO relay.

#25204 - 05/01/03 03:46 PM Re: shunt trip ckt bkrs  
ken m  Offline
Joined: Aug 2001
Posts: 58
south carolina
i picked up the shunt bkrs and and had them installed within 45min. thx for all the good fdbk. ken m

Member Spotlight
Montreal, Quebec, Canada
Posts: 28
Joined: March 2011
Show All Member Profiles 

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman


Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.014s Queries: 14 (0.002s) Memory: 0.8005 MB (Peak: 0.9664 MB) Zlib enabled. Server Time: 2017-09-26 21:37:51 UTC