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620-1987 - IEEE Guide for Construction and Interpretation of Thermal Limit Curves for Squirrel-Cage Motors Over 500 hp

Description: Assists in a uniform understanding of the construction, interpretation, and use of motor thermal limit curves. The author defines thermal limit curves, recommends a standard procedure for construction of the curves, and provides the definitions and information necessary to properly use these curves. He also describes thermal limit curves for large squirrel cage motors defined as those motor ratings built in frames larger than the frame normally used for 500 hp, 1800 r/min motors.
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