What is Elevator Shunt Trip?
|Elevator Shunt Trip Wiring Detail|
One last thing, the activation of heat detectors can delay the shunt trip via programming for a delay time not to exceed the time it takes the elevator cab starting at the top level to reach the lowest level of exit discharge. The purpose behind this allowance is to increase the potential for elevators to complete their travel to the recall level. Make note that the requirements of A17.1/B44 Safety Code for Elevators and Escalators would still apply.
Now if you choose to use the method of waterflow or pressure switch to activate you elevator shunt trip, any time delay switches or capability will not be permitted per NFPA 72 2013 section 21.4.3.
When the shunt trip breaker is activated, the breaker switch itself will be between on and off. To reset the breaker, make sure the controlling fire alarm system is reset and back to normal. Once the FACP is reset, flip the shunt trip breaker all the way towards the off position (should be some tension) and then flick it all the way back to on. Review the short video for more details on resetting a shunt trip breaker.