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N . Rated torque shall be at least 20 percent greater than the maximum full load torque requirements <br /> of the driven equipment throughout the full operating range of the driven equipment from start to <br /> full load. <br /> O . Stator: The stator shall be assembled from high grade electrical sheet steel laminations <br /> adequately secured together. The stator windings shall consist of materials such as polyester film, <br /> synthetic varnish or glass cloth . Windings shall be random or form wound, adequately insulated <br /> and securely braced to resist failure due to electrical stress and vibrations . Any junction in motor <br /> insulation, such as coil connections or between slot and end winding sections , shall have <br /> protection equivalent to that of the slot sections of coils . The entire winding of all motors when <br /> finished , shall be epoxy encapsulated , after subjecting to a process which removes all moisture <br /> and insures freedom of air pockets . Provide winding tropical/fungus protection . <br /> P . Rotor: The shaft shall be made of high grade machine steel or steel forging of size and design <br /> adequate to withstand the load stresses . The rotor shall be fabricated of high grade electrical <br /> sheet steel laminations adequately fastened together and to the shaft. Squirrel cage windings may <br /> be cast aluminum or copper alloy bar-type construction with brazed end rings . Provide winding <br /> tropical/fungus protection . <br /> Q . Bearings : Bearings shall be ball or roller antifriction type . Motors up to 300 h.p . shall be grease <br /> lubricated . Unless specified otherwise, the bearings shall have a B - 10 life as follows : <br /> Motor h.p . B- 10 Life Mrs) <br /> Less than 50 24 ,000 <br /> 50 to 200 409000 <br /> Greater than 200 100,000 <br /> 1 . For vertical motors , thrust bearings shall be Kingsbury Type, ball or roller bearings as <br /> required for the design thrust load. Guide bearings shall be radial type ball bearing. <br /> 2 . Fractional horsepower through 2 h.p . motors shall be furnished with Lubricated-for-Life <br /> ball bearings . <br /> 3 . Motors larger than 2 h.p . shall be furnished with relubricatable ball bearings except <br /> vertical pump motors . <br /> 4. Vertical pump motors larger than 2 h.p. shall be furnished with relubricatable ball, <br /> spherical, roller, or plate type thrust bearings. Lubrication shall be per manufacturer's <br /> recommendation for smooth operation and long life of the bearings. <br /> 5 . Water cooling shall not be required for the thrust bearings . <br /> R. Connections: <br /> 1 . Leads shall be suitably marked and identified. Terminal housing locations, which are not <br /> shown on the Contract Drawings, shall be NEMA Assembly F- 1 . <br /> i <br /> 044572017 <br /> 16490 - 6 <br />