Wire Elevator Shunt Trip and Shunt Trip Power Supervision

When fire system sprinklers are located where elevator equipment is located it is common to install a Shunt Trip. The shunt trip removes power from equipment BEFORE water is to flow on equipment. This prevents shock and prevents further use of the elevator. The shunt trip is triggered by a heat detector located within 18" of a sprinkler head and is intended to trip before the sprinkler head. 

If power is removed from the shunt trip circuit the relay will close and the fire alarm system will provide a "Shunt Trip Power" supervisory notice to the user. If the heat detector trips, power is provided to the shunt trip circuit and elevator power is shut down. This also results in a General Fire Alarm.