Classroom on demand

Welcome to Classroom on demand, your source for educational materials related to the vertical transportation industry. This site represents the knowledge and expertise of the best engineers and mechanics in the elevator industry, and will help those new to the elevator industry learn about the basic workings of elevator systems, and also will serve as a reference for people with more experience.

Independent Service

When activated through a key switch, the car is removed from group operation and will bypass all landing calls, deactivate hall/car riding lanterns, and respond only to car calls. Also known as hospital emergency operation.

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