What is the maximum tripping speed of a governor rated at 200 fpm?

The maximum tripping speed of a governor rated at 200 feet per minute (fpm) is typically set below the governor's rated speed to ensure proper safety measures are in place. In this case, a tripping speed of 175 fpm would allow the governor to effectively engage and control the elevator's motion, thereby preventing it from exceeding safe operational limits.

Setting the tripping speed at 175 fpm provides a buffer between the rated speed and the maximum allowable speed, allowing the system to respond to potential overspeed situations effectively. This safety margin is critical because it enables the governor to activate its safety mechanisms before the elevator reaches dangerous speeds that could lead to accidents or equipment failure.

The other speeds given, such as the 150 fpm, 200 fpm, and 220 fpm options, either do not provide the necessary safety margin or exceed the rated governor speed, which would not comply with safety regulations or best practices in elevator operation.