Regulations and standards are written in comparative principles, and five-party calling is a more concise way to meet these regulations and standards.
Some regulations and standards are now provided for reference:
TSG T7002-2005 "Details of Type Test for Traction and Forced Drive Elevators"
18.1 In-car alarm device The car should be equipped with an alarm device that can be easily identified and accessed by passengers.
18.2 Power supply for alarm device This device shall be powered by emergency lighting or equivalent (except for those connected to the public telephone network)
18.3 The type of emergency alarm device in the car shall adopt a two-way intercom system in order to continuously contact the rescue service. After activating this intercom system, passengers trapped in the car should not have to do anything else.
18.4 Intercom System If the elevator travel is greater than 30m, an intercom system or similar device powered by an emergency power supply is provided between the car and the machine room
18.5 Alarm device in the hoistway If the personnel working in the hoistway are in danger of being trapped and cannot escape through the car or the hoistway, an alarm device shall be provided where the danger exists. The alarm device shall also comply with the provisions of Articles 18.2 and 18.3 above.
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