Understanding the IEC 81800-5-1 safety standard for adjustable-speed electrical power-drive systems enables you to pick the right isolation solutions for AC motor drive applications. Electric motors are ubiquitous in industrial applications. They are used in fans, conveyor belts, printing presses, paper mills, cranes, mixers, hoists, lifts, cooling and recirculating pumps, blowers, compressors, factory robotics, and many other applications. More than 300 million industrial electric motors are in use worldwide, with the number growing steadily every year.