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.

Starting - Across the Line

Across the line starting – an economical motor starter used with motors up to 30 horsepower. With ALS, a heavy contactor is wired directly to the building power supply. ALS produces higher starting current than a solid state starter.

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