American Petroleum Institute Recommended Practice for Squirrel-Cage Induction Motors

The American Petroleum Institute has issued API-RP541, ``Recommended practice for form-wound squirrel-cage induction motors, 200 hp and larger.'' The recommended practice is reviewed from the combined points of view of the petroleum industry user and of the motor designer who, in addition, participated in preparation of the practice. Important aspects of the electrical and mechanical design and characteristic requirements, insulation systems, and testing requirements, and areas for future work are covered from the user's viewpoint. The participation of the National Electrical Manufacturers' Association Motor and Generator Section, a detailed review and comparison of motor starting capability requirements, and comments on specific parts of the practice are presented from the motor designer's viewpoint.