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Round 1 Bowling and Amusement 12/09/2024 Paradigm Design <br />Main Place Mall Expansion Grand Rapids, MI <br />Santa Ana, California <br />Project #2309147GR <br />B.Efficiency: Energy efficient, as defined in NEMA MG 1. <br />C.Service Factor: 1.15. <br />D.Multispeed Motors: Variable torque. <br />1.For motors with 2:1 speed ratio, consequent pole, single winding. <br />2.For motors with other than 2:1 speed ratio, separate winding for each speed. <br />E.Rotor: Random-wound, squirrel cage. <br />F.Bearings: Regreasable, shielded, antifriction ball bearings suitable for radial and thrust loading. <br />G.Temperature Rise: Match insulation rating. <br />H.Insulation: Class F. <br />I.Code Letter Designation: <br />1.Motors 15 HP and Larger: NEMA starting Code F or Code G. <br />2.Motors Smaller than 15 HP: Manufacturer's standard starting characteristic. <br />J.Enclosure Material: Cast iron for motor frame sizes 324T and larger; rolled steel for motor <br />frame sizes smaller than 324T. <br />2.4 POLYPHASE MOTORS WITH ADDITIONAL REQUIREMENTS <br />A.Motors Used with Reduced-Voltage and Multispeed Controllers: Match wiring connection <br />requirements for controller with required motor leads. Provide terminals in motor terminal box, <br />suited to control method. <br />B.Motors Used with Variable Frequency Controllers: Ratings, characteristics, and features <br />coordinated with and approved by controller manufacturer. <br />1.Windings: Copper magnet wire with moisture-resistant insulation varnish, designed and <br />tested to resist transient spikes, high frequencies, and short time rise pulses produced by <br />pulse-width modulated inverters. <br />2.Energy- and Premium-Efficient Motors: Class B temperature rise; Class F insulation. <br />3.Inverter-Duty Motors: Class F temperature rise; Class H insulation. <br />4.Thermal Protection: Comply with NEMA MG 1 requirements for thermally protected <br />motors. <br />C.Severe-Duty Motors: Comply with IEEE 841, with 1.15 minimum service factor. <br />2.5 SINGLE-PHASE MOTORS <br />A.Motors larger than 1/20 hp shall be one of the following, to suit starting torque and <br />requirements of specific motor application: