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IEEE 841-1994, IEEE Standard for Petroleum and Chemical Industry Severe Duty Totally Enclosed Fan-Cooled (TEFC) Squirrel-Cage Induction Motors-Up to and Including 500 hp, issued in 1994, has been updated and improved. The scope includes three-phase severe duty TEFC squirrel-cage induction motors with antifriction bearings in sizes up to and including 370 kW (500 hp) and motor rated voltages of 200, 230, 460, 575, 2300, and 4000 V at 60 Hz. Changes to the standard are reviewed in detail. Requirements are identified that improve motor reliability and increase motor life.