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No-load current basics: Practical guidelines for assessment

Publication date: 
February 2005
Author: 
Chuck Yung, EASA Senior Technical Support Specialist

How much no-load current should I expect when testing a motor? We would like to have a ratio of no-load amps / full-load amps, for quality control purposes. Many of us expect a motor to draw approximately one-third of rated current, when operating from rated voltage on our test panel. That is a good rule of thumb - most of the time. While there are lots of exceptions, most of them are predictable.