The main building I maintain is getting a Mod soon, including shunt trip. I'm looking for anyone who knows of any buildings that have altered the main idea of killing power immediately once the machine room heat detector has been tripped. I know this is a controversial subject, and would love to hear any and all opinions. Thanx, Mark

-- Mark (MarkVator@comcast.net), March 01, 2004

Answers

I have seen many jobs with shunt trip breakers, the ones I have seen are the black molded case breakers with a little solinoid inside and small control wires coming out of the breaker to trip when energied. when there is a fire the smoke detector goes of first brings car to lobby,then next the heat detector and then the sprinklers. There is codes governing the location of the heat and smoke detectors and there is much controversy if the shunt trip breaker should be inthe mr or on another panel in the building. If the shunt trip is in the mr and there is a fire and it trips the top portion of the breaker is still full voltage, check you enforcing attority.

-- Jim (elevator555@hotmail.com), March 02, 2004.

THIS FOR USE WHEN SPRINKLERS ARE IN THE SHAFT WAY TO AVOID THE ELEVATOR MOVING AND GETTING POURED ON AT THE SAME TIME ONCE THE HEAT SENSOR DETECTS HEAT THE SHUNT TRIP OPENS THE MAINLINE (SOME SHUNT TRIPS CAN BE BOUGHT TO WORK WITHIN THE SAME BOX, BENFIELD ELECTRIC 718-706-8600 ASK FOR PAUL SICKLER).

-- the inspector (J.KANE@AMERELV.COM), March 08, 2004.

In Detroit all elevators with sprinklers in the shaft above 24" off the pit floor or in the M.R has to have shunt trip. The way it functions here is as follows. The heat detector goes off, it sends the elevator to the nearest floor, opens the doors and severs power.Power is severed only when the door open limit is reached preventing fireman to get stuck on phase 2. If shunt trip is activated during phase 1 recall it will remain in flight until it reaches the recall floor and sever power once the door limit is reached.

-- (elevatorman911@aol.com), June 29, 2004.