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Updated to the 2011 National Electrical Code®, ELECTRICITY 4: AC/DC MOTORS, CONTROLS, AND MAINTENANCE, 10e delivers practical coverage of AC/DC motors, controls, and maintenance. It offers students quick and easy access to current information on DC motors, AC motors, motor control, electromechanical and solid-state relays and timers, synchronous motors, installation, sensyn units, motor maintenance, and more. The text combines thorough explanations of how systems work with relevant, hands-on examples of electrical system operation to develop troubleshooting skills.