API Std 547:2005

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 speeds
• are rated less than 800 hp (600 kW) for two-pole (3000 or 3600 RPM) motors of totally-enclosed construction
• are rated less than 1250 hp (930 kW) for two-pole motors of WP-II type enclosures
• drive centrifugal loads
• drive 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.