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By Gilbert A. McCoy

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Replacing a standard motor with an energy-efficient motor in a centrifugal pump or fan application can result in increased energy consumption if the energy-efficient motor operates at a higher RPM. A standard-efficiency motor with a rated full-load speed of 1,750 RPM should be replaced with a high-efficiency unit of like speed in order to capture the full energy conservation benefits associated with a high-efficiency motor retrofit. Alternatively, you can use sheaves or trim pump impellers so equipment operates at its design conditions.

This protects fingers or rods from accidental contact with rotating or electrical parts. Splash-Proof. An open motor in which ventilation openings prevent liquid or solids from entering the machine at any angle less than 100 degrees from the vertical. Totally-Enclosed. A motor enclosed to prevent the free exchange of air between the inside and outside of the case, but not airtight. Totally-Enclosed Nonventilated (TENV). A totallyenclosed motor that is not equipped for cooling by means external to the enclosed parts.

October 1988. 16. The Lincoln Electric Company Fundamentals of Polyphase Electric Motors. Cleveland, Ohio. April 1987. 5. Reliance Electric. A-C Drives: A Key to Reducing Operating Costs and Increasing Productivity. 17. , Electrical Senior Staff Engineer Hoechst Celanese Textile Fibers, Rock Hill, South Carolina Presented in an Energy Management short course entitled “Energy Auditing and Analysis of Industrial Commerical Facilities. “University of Wisconsin - Madison. 1990. 6. Seton, Johnson & Odell.

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