Superseded Standard

ANSI/IEEE 620-1981

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

This guide defines thermal limit curves, recommends a standard procedure for construction of the curves, and provides the definitions and information necessary t o properly use these curves. 2.2 The guide 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 500hp , 1800r/min motors.

Superseded Standard
Board Approval

Working Group Details

Other Activities From This Working Group

Current projects that have been authorized by the IEEE SA Standards Board to develop a standard.

No Active Projects

Standards approved by the IEEE SA Standards Board that are within the 10-year lifecycle.

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These standards have been replaced with a revised version of the standard, or by a compilation of the original active standard and all its existing amendments, corrigenda, and errata.

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No Inactive-Withdrawn Standards

These standards are removed from active status through an administrative process for standards that have not undergone a revision process within 10 years.

No Inactive-Reserved Standards
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