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standard by American Petroleum Institute, 01/01/2005
This standard covers the requirements for form-wound induction motors for use in general-purpose petroleum, chemical and other industrial severe duty applications. These motors:are rated 250 hp (185 kW) through 3000 hp (2250 kW) for 4, 6 and 8 pole speedsare rated less than 800 hp (600 kW) for two-pole (3000 or 3600 RPM) motors of totally-enclosed constructionare rated less than 1250 hp (930 kW) for two-pole motors of WP-II type enclosuresdrive centrifugal loadsdrive loads having inertia values within those listed in NEMA MG 1 Part 20)are not induction generators
NOTE: Motors larger than that covered above and motors in other applications should be specified in accordance with API Std 541.