Elevators: Power Shunt Trip

02/15/2011
Article and photos by Gregory HavelIn multistory buildings protected by automatic fire sprinkler systems, building codes require sprinkler heads to be located at the top of the elevator hoistway to protect the vertical shaft and the elevator car inside it and in each elevator machine room. Most states and other jurisdictions have adopted American Society of Mechanical Engineers (ASME) A17.1 and A18.1 standards for the installation and operation of elevators, either as published by ASME or with additions or exceptions. If a sprinkler head were to discharge water into the elevator hoistway or machine room during operation, it is likely that the elevator would operate unpredictably...

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