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   PART 1 - GENERAL

    01 WORK INCLUDED

    A. Work under this section is to include motors not supplied as an integral part of the equipment.

    02 RELATED WORK

    A. Refer to Division 16, Electrical specifications.

    B. Electrical installations shall comply with the latest edition of the National Electrical Code.

    03 SUBMITTALS

    A. Shop drawings submitted for approval shall include the following motor data:

    1. Manufacturer

    2. Nameplate rated horsepower, voltage and RPM

    3. NEMA type

    4. Code letter

    5. Locked rotor current

    6. Full load current

    7. Full load efficiency

    8. Full load power factor

    9. Outline drawings and dimensions

   PART 2 - PRODUCTS

    04 MANUFACTURERS

    A. Provide motors as manufactured by Century/Gould, General Electric or approved equal.

    B. All motors shall be supplied by the pump manufacturer. The pump manufacturer shall be responsible for assuring motors are compatible with pumps and function as required without overloading.

    05 MOTORS - GENERAL

    A. All motors shall be in conformance with the latest applicable NEMA standards and shall receive routine factory tests in accordance with IEEE test procedures and additional tests as specified in this Section.

    B. Torque and speed characteristics of motors shall be suitable to operate the driven equipment over the full range of equipment operating load conditions without exceeding the nameplate current ratings.

    C. Motors shall be general purpose except that definite purpose motors shall be furnished for special equipment requiring a motor drive with unusual characteristics.

    D. Motor leads terminal boxes shall be oversized and shall be located so as to be readily accessible.

    E. Polyphase motors shall be NEMA Design B and single-phase fractional horsepower motors shall be NEMA Design N.

    F. Motors shall be rated for continuous service.

    G. Motors shall be equipped with extended storage seals inside the junction boxes.

    06 CENTRIFUGAL WASTEWATER PUMP MOTORS

    A. Motors to be provided with wastewater pumps and shall comply with the following requirements.

    1. Bearings and Lubrication:

    a) Motors shall have antifriction bearings of B-10 minimum 100,000 hour life.

    b) Bearings shall be oil or grease lubricated.

    c) Gravity fed, oil lubricated bearings shall have oil reservoirs with level gauges. Gauges shall indicate normal oil levels for both running and rest conditions.

    d) Bearing housings shall be designed to prevent the throwing or dripping of lubricant from the bearings or leakage along the shafts.

    2. Cooling:

    a) Motors shall have screens over ventilating openings, double end ventilation with inspection covers and removable end shrouds on each side. Split air baffles shall be provided to permit access to bearings without disconnecting motor couplings or wiring.

    3. Noise:

    a) Motors shall be designed and constructed for quiet operation. At any position five feet from the motor, the sound pressure when operating at full speed and no load shall not exceed 85 DB on the A scale on any brand from 20 cycles to 10 kilocycles.

    4. Vibration:

    a) Motor vibration when operating at any point between no-load and full-load shall not exceed five mills displacement from peak to peak when measured in a horizontal place at the top of the motor.

    b) Motors shall be wired with vibration detectors to signal an alarm at vibration levels in excess of motor manufacturer limits.

    5. Terminal Box:

    a) Motors shall have oversize stator terminal boxes containing the following equipment:

    1) Three through-type current transformers, with approximately 50 to 5 ratios, to provide for self- balancing, primary current motor differential protection. The transformers shall have extra large windows for passing both incoming and outgoing primary motor leads.

    2) Suitable three-phase surge capacitors.

    3) Three station type lightning arrestors.

    4) Leads from both ends of each phase winding.

    5) Stress cone terminations.

    6. Temperature Detectors:

    a) Each motor bearing shall have two resistance type temperature detectors (RTD's) including necessary thermowells and fittings. The detectors shall be ten ohm, three-wire type, spring loaded to maintain contact with the bearing and shall be wired to a terminal box on the motors.

    b) Motors shall have six resistance type temperature detectors in the stator windings between the coil side of different phases, all in accordance with IEEE recommendations. Detectors shall have a zero to ten ohm rating and shall be suitable for connection to control items. The detector coils shall be wired to a terminal box on the motors. The three conductors to each detector element shall be made up into a single cable provided with galvanized steel armor or other approved jacket. One conductor of each element shall be grounded to the stator at the terminal block. The two detector coils showing the highest and next highest temperatures on shop test shall be appropriately marked on the terminal block for connection to remote temperature relays.

    7. Space Heaters:

    a) Motors shall be provided with a strip heater of sufficient wattage to prevent condensation on the core or windings. Heater shall have rust-proof sheaths and be connected to an enclosed terminal block on the side of the motor frame by conductors with heat-resistant insulation.

    b) Heaters shall operate on 120 volt, single phase, alternating current power supplied thru VFDS.

    8. Tests:

    a) Tests shall be made at the factory and witnessed by the Engineer on all motors to demonstrate that they are free from electrical and mechanical defects and are in conformity with the requirements of the specifications. These tests shall include the following and shall be submitted with the shop drawings. All witness testing shall be included in the Contractors base bid.

    1) Resistance measurements of windings.

    2) High potential tests on windings.

    3) Measure no-load currents of stator windings at rated voltage and frequency.

    4) Check of current balance of polyphase windings.

    5) Measure air gaps.

    6) Mechanical checks including balance, vibration, noise, bearings, heat, torque and efficiency.

    9. Efficiency:

    a) Motors shall be rated at not less than 92% efficiency.

    10. Motors for pumps driven by variable frequency drive units shall be 590 RPM ODP squirrel cage induction type designed for 2300 volt, three-phase, 60 hertz operation with Class F insulation, and rated for continuous operation in an ambient temperature of 400C. Motors shall have a service factor of 1.15, but will not be used above the 1.0 with the VFD

   PART 3 - EXECUTION

    07 INSTALLATION OF MOTORS

    A. Install electric motors where shown, in accordance with manufacturer's written instructions, and with recognized industry practices, to insure that motors comply with requirements and serve intended purposes. Comply with NEMA standards and requirements of NEC.

    08 ELECTRICAL CONNECTIONS

    A. Insure that motors are wired properly, with rotation in direction indicated and intended for proper pump performance.

    END OF SECTION