BUILDING NO.SC#

PROJECT NAME

SECTION 262419 – MOTOR-CONTROL CENTERS

PART 1 - GENERAL

1.1 SUMMARY

  1. Related Documents:
  2. Drawings and general provisions of the Subcontract apply to this Section.
  3. Review these documents for coordination with additional requirements and information that apply to work under this Section.
  4. Section Includes:
  5. Indoor and outdoor motor control centers (MCCs) for use on AC circuits rated 600 volts or less.
  6. Related Sections:
  7. Division 01 Section "General Requirements."
  8. Division 01 Section "Special Procedures."
  9. Division 01 Section "Common Work Results for Electrical".
  10. Division 01 Section "Lateral Force Procedures."
  11. Division 26 Section "Secondary Grounding for Electrical Systems".

1.2 REFERENCES

  1. General:
  2. The following documents form part of the Specifications to the extent stated. Where differences exist between codes and standards, the one affording the greatest protection shall apply.
  3. Unless otherwise noted, the referenced standard edition is the current one at the time of commencement of the Work.
  4. Refer to Division 01 Section "General Requirements" for the list of applicable regulatory requirements.
  5. Refer to Division 26 Section "Common Results for Electrical" for codes and standards, and other general requirements.
  6. ANSI/NFPA 70 - National Electrical Code.
  7. LBNL Facilities Department Lateral Force Design Criteria.
  8. NFPA – National Fire Protection Association:
  9. Standard for Electrical Safety in the Workplace (NFPA 70E)
  10. NEMA – National Electrical Manufacturers Association:
  11. NEMA 250 - Enclosures for Electrical Equipment
  12. NEMA AB1 Molded Case Circuit Breakers & Molded Case Switches
  13. NEMA ICS 2 Industrial Control Devices, Controllers and Assemblies.
  14. NEMA ICS 2.3 Instructions for Handling Installation, Operation and Maintenance of Motor Control Centers.
  15. NEMA KS1 Enclosed and Miscellaneous Distribution Equipment Switches (600 Volts Max.)
  16. NETA ATS - Acceptance Testing Specifications for Electrical Power Distribution Equipment and Systems
  17. UL – Underwriters' Laboratories:
  18. UL 485 Motor Control Centers.
  19. UL 489 Molded Case Circuit Breakers and Enclosures.
  20. UL 508 Industrial Control Equipment.

1.3 SUBMITTALS

  1. Submit under provisions of Division 26 Section "Common Results for Electrical - Review of Materials" and Division 01 Section "General Requirements."
  2. Submit five (5) copies of Product Data and Shop Drawings for equipment and component devices. Include time–current curves of fuses, relays, circuit breaker trip units.
  3. Include dimensional plans and elevations; conduit entrance locations and requirements; component and device lists and descriptions; and a three line diagram showing horizontal and vertical bus full-load and short-circuit ratings of the MCC.
  4. Include interconnecting wiring diagrams pertinent to the class and type specified for the motor control center, and a schematic diagram of each type of controller unit indicated.
  5. Manufacturer's Installation Instructions: Indicate application conditions and limitations of uses. Include instructions for storage, handling, protection, examination, preparation, installation, and starting of the MCC.
  6. Operation and Maintenance Data:
  7. Maintenance Data: Furnish five (5) original copies and 1 compact disc of recommended maintenance procedures and intervals. Include spare parts data listing; source and current prices of replacement parts and supplies.
  8. Furnish five (5) hardcopies and 1 compact disc of As-Built Drawings which include the elementary and connection diagram. Electronic drawing files shall be in AutoCAD 2002 format.
  9. Furnish Time–Current curves of fuses, relays, circuit breaker trip units. Time–Current curves shall be first generation originals on full size 11 by 17 inches (280 by 432 mm) paper.
  10. List special tools and spare parts required for maintenance and repair.
  11. Name, address, and phone number of the service representative to be called in the event of equipment failure.
  12. Submit five (5) copies of the warranty certificate.

1.4 QUALITY ASSURANCE

  1. Products shall be tested, approved and labeled/listed by Underwriters Laboratories, Inc., or by a nationally recognized testing laboratory (NRTL) as listed in Division 26 Specification "Common Work Results for Electrical."
  2. Electrical equipment and materials shall be new and within one year of manufacture, complying with the latest codes and standards. No used, re-built, refurbished and/or re-manufactured electrical equipment and materials shall be furnished on this project.

1.5 DELIVERY, STORAGE, AND HANDLING

  1. Store in a clean, dry space. Maintain factory wrapping or provide an additional heavy canvas or heavy plastic cover to equipment and material from dirt, water, construction debris, and traffic.
  2. Handle in accordance with manufacturer's written instructions and NEMA ICS 2.3. Lift only by lifting lugs or devices provided for the purpose. Handle carefully to avoid damage to motor control center internal components, enclosure, and finish.

1.6 WARRANTY

  1. Manufacturer's Warranty: Warranty period shall start at the date the equipment is energized after acceptance by the University.
  2. Warranty period of one year minimum shall start at the date the equipment is acceptance by the University

1.7 EXTRA MATERIALS

  1. Spare fuses: Furnish six (6) spares of each type and rating of fuse and fusible devices required. Include spares for:
  2. Spare Indicating Lights: Furnish six (6) of each type required.
  3. Touch-Up Paint: Furnish one (1) half-pint container.

PART 2 - PRODUCTS

2.1 MANUFACTURERS

  1. Eaton/Cutler-Hammer.
  2. General Electric.
  3. Siemens Energy & Automation, Inc.

2.2 MOTOR CONTROL CENTER

  1. Motor Control Center: NEMA ICS 2, Class I, Type B. Provide pressure type pull-apart blocks. Identify each terminal with a wire number corresponding to the shop drawing.
  2. Ratings and Classifications:
  3. Voltage, Phases, Wires and Frequency: [480V] [480/277V] [208V] [208/120V], 3-Phase, [3-Wire] [4-Wire], 60 Hz.
  4. Current:Horizontal (Main) bus; _____ Amperes
  5. Vertical bus _____ Amperes
  6. Short Circuit Rating: [42] [65] [100] kAIC symmetrical.
  7. Main Circuit Breaker: The MCC shall be provided with a Main Circuit Breaker with a solid state trip unit having the following trip functions
  8. Instantaneous
  9. Long time pickup
  10. Long time delay
  11. Short time pickup
  12. Short time delay
  13. I2t feature
  14. Ground fault pickup
  15. Ground fault delay
  16. Bus Work: Bus work shall be copper and sized for the continuous current ratings specified above. Provide a copper ground bus the entire length of control center and bonded to each enclosure section. Provide silver plated or tin plated contact surfaces on busses.
  17. Configuration: Units front mounting only, accessible from the front only. Bus splice plates front accessible. Maximum overall length as shown on the drawings. Provide top and bottom horizontal wireways. Provide hinged vertical wireways with wire supports. Drawout units shall be in increments of 6 inches (150 mm) with a minimum size of 12 inches (300 mm). Maximum drawout units in a vertical section to be 6.
  18. Enclosure:
  19. NEMA ICS 6, [Type 1 Gasketed] [NEMA Type 3R] [NEMA Type 12]. The MCC shall be full assembled and free-standing. Provide a welded steel framework, adequately braced and attached to a steel channel base, to meet the requirements of Seismic Zone 4.
  20. Paint: The enclosure shall be thoroughly cleaned, primed and painted in accordance with the manufacturer’s standard finishing process. Exterior enclosure covers and doors shall be ANSI-61 gray. Enclosure interior and drawout assemblies shall be white.
  21. Drawout Assembly: Provide removable combination starter compartments, interchangeable for different size starters, with barriers to completely enclose a drawout starter assembly. Provide insulating barriers with openings for stab connectors on starter units located on the starter side of the vertical bus. Provide insulated covers for unused drawout openings.
  22. Metering:
  23. Provide electronic metering to indicate, as a minimum, the following values:
  24. Voltage: Line-to-Line and Line-to-Neutral
  25. Current: All Phases, neutral and Ground
  26. Power and Energy: kWH, kW Demand, kVAH, kVA Demand
  27. Power Factor
  28. Frequency
  29. Total Harmonic Distortion: Volts and Amperes
  30. Electronic metering shall be provided with a communications module with a 10Base-T Ethernet and an industry standard RS-485 serial bus compatible with Modbus protocol.
  31. Potential, control power and current transformers shall be completely installed and wired to the power meter in the panelboard.
  32. The electronic power meter shall be Square D PowerLogic ION7350 or higher, Siemens Model 9350 or higher, Power Measurement Limited Model 7350 or higher, or approved equal. The supplier shall obtain the written approval for substitution from the University.

2.3 MOTOR CONTROLLERS

  1. Coordinate the features of each motor controller with the ratings and characteristics of the supply circuit, the motor, the required control sequence, the duty cycle of the motor, drive, and load; the pilot devices; and the control circuit affecting controller functions. Provide controllers that are NEMA rated to suit the motor controlled. Position motor controllers within the MCC structure as shown on the drawings.
  2. Contacts shall open each ungrounded connection to the motor or load.
  3. Motor protection shall be provided by a solid state, microprocessor based overload and fault protection system. Overload protection shall consist of one current sensor located on each phase monitored by a microprocessor that yields a time current curve closely paralleling that of the motor heating damage boundary, accurate to 2 percent. Running overload protection shall be field selectable for the specific motor full load amperes within the starter range. Trip class of 10, 20, and 30 shall be field selectable and provide 10, 20 or 30 second delay at six times the full load running protection respectively.
  4. Motor protection is to monitor current in each phase to provide phase loss and phase unbalance protection, such that if the unbalance on two phases is greater than 30 percent of the selected trip rating, a phase loss/unbalance trip occurs. Provide phase loss/unbalance protection which requires no time delay for reset.
  5. Ground fault protection shall be provided and set at 20 percent of maximum continuous ampere rating and have a start delay of 20 seconds, and a run delay of one second to prevent nuisance tripping on starting.
  6. The microprocessor shall measure control circuit voltage and prevent closing of the coil on low voltage (78 volts AC) and/or high voltage (135 volts AC) conditions that are outside the coil ratings.
  7. Provide full voltage, non-reversing across-the-line, magnetic controller, except where another type is required.
  8. Provide control power transformer integral with the controller where no other supply of 120 VAC control power to the controller is indicated. Provide control power transformer with adequate capacity to operate connected pilot, indicating and control devices, plus 100 percent spare capacity.
  9. Combination motor controller shall include motor circuit protector type molded-case circuit breaker with magnetic-only trip element calibrated to coordinate the actual locked-rotor current at the connected motor and the motor controller overload relays. Provide circuit breakers that are factory assembled with the controller, interlocked with the unit cover or door, and arranged to disconnect the controller. Provide motor circuit protectors with field adjustable trip elements as specified above.
  10. Communications: Each motor controller shall be capable of communications via a twisted-pair network.
  11. Provide [green "RUN" and red "STOP"] [red “RUN” and green “STOP”] indicating pilot lights, HAND-OFF-AUTO selector switch, and two each normally open and normally closed auxiliary contacts for each motor controller. Indicating lights shall be LED type.
  12. Spaces and blank compartments shall be fully bussed and equipped with guide rails or equivalent, ready for insertion of p units.
  13. Spare units shall be of the type, size and ratings indicated and installed in compartments indicated “spare.”

2.4 OPTIONS AND FEATURES

  1. Auxiliary Contacts: NEMA ICS 2, 2 each normally open, 2 each normally closed, convertible contacts in addition to seal-in contact.
  2. Cover Mounted Pilot Devices: NEMA ICS 2, standard duty oil tight type.
  3. Pilot Device Contacts: NEMA ICS 2, Form Z, rated A150.
  4. Push buttons: Flush type. Start - Stop
  5. Indicating Lights: LED type. Two per starter. One red, one green.
  6. Selector Switches: Rotary type, hand-off-auto (HOA).
  7. Control Power Transformers: 120 volt secondary, in each motor starter. Provide fused primary and secondary, and bond unfused leg of secondary to enclosure.
  8. Identification: Equip each starter cubicle door with engraved nameplate showing the circuit number of the motor controlled, the LBNL maintenance designation of the load and the horsepower of the motor. Nameplates shall be of a size to accommodate minimum one quarter-inch high letters.
  9. Lockouts: Provide space for padlocking starters in the OFF position with at least two padlocks.
  10. Distribution Panelboards: If required to be provided with the MCC, the distribution panelboard shall meet the requirements of Division 26 Section "Panelboards", Part 1 and Part 2. The configuration and ratings of the circuit breakers within the panelboard shall be as shown on the drawings and/or panel schedule.

PART 3 - EXECUTION

3.1 FIELD QUALITY CONTROL

  1. Comply with requirements of NETA Acceptance Testing Specifications for Electrical Power Distribution Equipment and Systems and the manufacturer’s inspection, testing, calibration and start-up procedures. The manufacturer’s technician shall perform inspection, testing, calibration and start-up, with assistance from the Subcontractor as necessary, and in the presence of the University’s representative. Schedule testing and start-up with at least ten (10) working days advance written notification.
  2. Visual and Mechanical Inspection: Inspect for physical damage, proper alignment, anchorage, and grounding. Check proper installation and check tightness of connections for bus with calibrated torque wrench.
  3. Perform insulation resistance test of motor control center buses, components, connecting supply feeder, and control circuits. Insulation resistance less than 100 megohms is not acceptable.
  4. Perform continuity tests of circuits.
  5. For each, motor controller, perform operational test and exercise of mechanical components and operable devices in accordance with manufacturer's instruction manual.
  6. Verify ratings and settings of overload relays, motor circuit protectors, and overcurrent protective devices.
  7. Provide the University with five (5) certified copies of field test reports.
  8. Conduct a minimum of four (4) hours of training in operation and maintenance. Schedule training with at least five (5) working days advance notification.

3.2 ACCEPTANCE

  1. Final acceptance shall depend upon the satisfactory test results as performed in accordance with the manufacturer’s instructions. Equipment shall not be energized for service until test data and records are approved by the University.

END OF SECTION 262419

LBNL Facilities Master Specifications262419-1Revised

Motor-Control Centers06/22/09