C06_Attachment_1_-_Specifications_0008.pdf

Nimbus Powerplant Station Service Replacement Supply Contract Auburn-Folsom South Unit, American River Division Central Valley Project, California Solicitation No.

600 Volt Motor Control Center

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SECTION 26 24 43

600 VOLT MOTOR CONTROL CENTERS

PART 1 GENERAL

1.01 MEASUREMENT AND PAYMENT

A. 600 Volt Motor Control Centers:

1. Payment: Lump sum price offered in the Price Schedule.

B. Cost:

1. Include cost of final drawings, diagrams, and operation and maintenance instruction book in lump sum price offered in the Price Schedule for Final Electrical Drawings and Data.

1.02 REFERENCE STANDARDS

A. Institute of Electrical and Electronics Engineers (IEEE)

1. IEEE C57.13-2008 Instrument Transformers

B. National Electrical Manufacturers Association (NEMA)

1. NEMA 250-2014 Enclosures for Electrical Equipment (1000 Volts Maximum)

2. NEMA FU 1-2012 Low Voltage Cartridge Fuses

3. NEMA ICS 1-2000(2015) General Requirements

4. NEMA ICS 2-2000(2020) Controllers, Contactors and Overload Relays Rated 600 V

5. NEMA ICS 5-2017 Control Circuit and Pilot Devices

6. NEMA ICS 18-2001(2007) Motor Control Centers

7. NEMA KS 1-2001(2013) Enclosed and Miscellaneous Distribution Equipment Switches (600 Volts Maximum)

8. NEMA PB 1-2011 Panelboards

9. NEMA WC 70-2009 Nonshielded Power Cables Rated 2000 Volts or Less for the Distribution of Electrical Energy

C. National Fire Protection Association, Inc. (NFPA)

1. NFPA 70-2023 National Electrical Code (NEC)

D. Underwriters Laboratories, Inc. (UL)

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1. UL 845-2005 Motor Control Centers

2. UL 489-2016 Molded-Case Circuit Breakers, Molded- Case Switches, and Circuit-Breaker Enclosures

3. UL 1449-2021 Transient Voltage Surge Suppressors

1.03 DESIGN REQUIREMENTS

A. Design layout of motor control center sections to:

1. Provide devices and equipment to match existing functionality of MSA and N2A.

2. Be installed in same location as exiting equipment.

a. Manufacturer shall conduct site visit prior to design to evaluate existing conditions and confirm available space.

B. Determine size and ratings of the following:

1. Fuses.

2. Motor overload relays. Size overload relays in accordance with requirements of

NFPA 70.

3. Control circuit transformers.

4. Instrument transformers.

C. Conform to referenced IEEE, NEMA, NFPA, and UL standards.

D. Wire all spare contacts to terminal blocks.

1.04 SUBMITTALS

A. Submit the following in accordance with Section 01 33 00 - Submittals and Section 01 33 26 - Electrical Drawings and Data.

B. RSN 26 24 43-1, Approval Data:

1. Manufacturers’ technical data.

2. Time-current characteristic curves.

a) Provide characteristic curves for motor circuit breaker, motor overload, etc.

b) Include motor inrush, full-load, and locked-rotor currents.

c) Curves to be plotted on same log-log graph.

C. RSN 26 24 43-2, Approval Layout Drawings (Government Format):

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1. Equipment layout diagram including the method of attaching motor control center to floor.

2. Nameplate list.

3. Bill of materials.

D. RSN 26 24 43-3, Schematic Diagrams (Government Format):

1. Include a separate schematic for each motor control center compartment.

2. Schematic diagram to show all portions of the actual circuitry, regardless of whether the circuitry is located within the motor control center or at another location.

E. RSN 26 24 43-4, Wiring and Interconnection Diagrams (Government Format).

F. RSN 26 24 43-5, Schematic, Wiring, and Interconnection Diagram Check Prints (Government Format).

G. RSN 26 24 43-6, Factory Test Reports.

H. RSN 26 24 43-7, Final Drawings (Government Format).

I. RSN 26 24 43-8, Field Test Reports.

J. RSN 26 24 43-9, Operation and Maintenance Instruction Book:

1. Include the following:

a. Title page/index.

b. Bill of materials.

c. Copies of informational data.

d. As-Built drawings.

e. Time-current characteristic curves.

f. Motor circuit breaker ratings and settings.

g. Motor overload relay settings.

h. Undervoltage relay setting.

1.05 REGULATORY REQUIREMENTS

A. UL listed and labeled.

1.06 DELIVERY, STORAGE, AND HANDLING

A. Handle and store equipment in accordance with manufacturer’s instructions. Include copy of these instructions with equipment at time of shipment.

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1.07 PROJECT CONDITIONS

A. Ambient Temperature Range: 0 to 40 degrees C.

B. Altitude: 150 feet.

1.08 EXTRA MATERIALS

A. Furnish following spare parts:

1. Main operating coil for each different NEMA size contactor furnished: 1.

2. Magnetic motor starter power contact assembly for each different NEMA size contactor furnished: 1.

3. Fuses of each type and size furnished: 6.

4. LEDs of each type furnished: 5.

5. Indicating light lens of each type and color furnished: 1.

6. Control circuit transformer for each type furnished: 1.

7. Auxiliary relay for each different size furnished: 1.

8. Timing relay for each size and type furnished: 1.

9. Overload relay of each type and size furnished: 1.

PART 2 PRODUCTS

2.01 RATINGS AND GENERAL REQUIREMENTS

A. Line-To-Line Voltage: 480 volts.

B. Horizontal Bus: 600 amperes, silver-plated copper. Bus rating based on 65 degree C maximum temperature rise in a 40 degree ambient.

C. Vertical Bus Extensions: 600 amperes, silver-plated copper.

D. Phase and Frequency: 3-phase, 60 Hz.

E. Power Configuration: 3 wire.

F. Short Circuit Rating: 18,000 amperes RMS symmetrical, minimum.

G. NEMA Wiring Class and Type: II-S, B-T in accordance with NEMA ICS 18.

2.02 CONSTRUCTION

A. Enclosure: NEMA 250, Type 1.

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1. Features:

a. Conduit entry: From below and above.

2. Size to install in location of existing equipment.

B. Incoming Feeder Termination and Device: Provisions to terminate incoming cable within motor control center on main lugs in a separate incoming line lug compartment.

C. Bus and Bus Connectors:

1. Solid-bar type.

2. Horizontal bus to extend full length of motor control center.

D. Ground Bus:

1. Material: Copper bar at least 1/4 -inch by 1-inch.

2. Continuous along bottom on motor control center sections.

3. Mechanically and electrically bonded to motor control center enclosure.

4. Provide compression lug at each end of ground bus. Size lug to connect ground bus to plant ground system with stranded bare-copper cable as shown.

5. Provide vertical ground bus in each section. Connect vertical ground bus to the horizontal ground bus.

E. Barriers:

1. Isolate power busses from unit compartments and wireways.

2. Mount horizontal bus on a glass-filled polyester support assembly that braces the bus against forces generated during short circuit.

3. House vertical bus on a molded glass-filled polyester support that provides bus insulation and braces the bus against forces generated during short circuit.

Provide access openings in the support for unit stab-on connections. Provide each access opening with manual shutter to close off the opening.

F. Wireways:

1. Horizontal Wireway:

a. Top and bottom of each section. Extend full depth of section.

b. Removable covers held shut with captive screws.

c. Isolated from power bus by steel barriers.

2. Vertical Wireway:

a. Extend full length of section between horizontal wireways.

b. Removable hinged cover.

c. Isolated from power bus by steel barriers.

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2.03 PLUG-IN UNITS (BUCKETS)

A. General:

1. Modular plug-in type for starters through NEMA size 5.

2. Make connection between plug-in unit and vertical bus with plug-in power stabs.

Back stabs with spring steel clips designed to maintain high pressure, two-point connection.

3. Designed to prevent insertion or removal from motor control center unless unit door and disconnect device are open.

4. Designed to house components of individual motor control circuit.

B. Mounting:

1. Supported and guided by removable unit support pan. Support pan capable of being moved without tools.

2. Held in place with two, front accessible, multi-turn latches, minimum.

C. Disconnect Device Handle:

1. Type: Industrial, heavy-duty flange mounted mechanism that remains engaged with disconnect device regardless of unit door position.

2. Have up-down motion with down as OFF. ON-OFF position prominently marked on operator.

3. Provide with means for padlocking in both ON and OFF position.

4. Interlocked with unit door such that disconnect means cannot be switched to ON unless door is closed and door cannot be opened unless disconnect means is switched to OFF.

5. Provide mechanical means to purposely defeat interlock that is externally operated with screw driver.

D. Door:

1. Removable and mounted on pin type hinges.

2. Latch: 1/4 turn pawl type designed to resist forces during fault conditions.

3. Door swing: 110 degrees, minimum.

4. Fastened to stationary structure of motor control center such that door will cover unit space with plug-in unit removed.

5. Provided with external, low profile motor overload reset pushbutton. Include mechanical extension device to allow overload relay to be reset without opening unit door.

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2.04 MOTOR CONTACTORS

A. Type: Magnetic, full-voltage, non-reversing as shown.

B. Voltage: 600 volts, 60 Hz.

C. Coil: 120 volts, 60 Hz.

D. Power Contacts: Weld-resistant, double-break, and silver alloy type.

E. NEMA rated and sized for motor horsepower loads. Contactor rated and sized to IEC standards is not acceptable.

F. Power contacts, contactor coil, and auxiliary contacts designed to be inspected and replaced.

G. Provide sufficient auxiliary contacts to perform functions shown.

2.05 MOTOR OVERLOAD RELAYS

A. Suitable for use on 120 volt, 60 Hz. control circuits.

B. Relay output contacts rated for intended application.

C. Relays to be mounted in cubicle that contains the associated control circuit.

D. Type: Eutectic alloy, bi-metallic, or solid state, manual reset.

E. Provide overload element for each phase of motor power circuit.

F. Trip class designation: NEMA Class 20.

G. Output contacts: One NC and one NO.

H. Conform to NEMA ICS 2.

2.06 MOLDED-CASE CIRCUIT BREAKERS

A. Ratings: As shown on drawings.

B. Interrupting Rating: 18 kA symmetrical, minimum.

C. Trip:

1. Thermal-magnetic type with inverse-time trip characteristics on overload and instantaneous trip on short circuit.

D. Construction: High-strength, molded, glass-reinforced polyester case and cover.

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E. Provide with overcenter, toggle hand-operated, trip free mechanism with quick make and quick break action independent of speed of toggle handle operation.

F. Provide with common tripping of all poles.

G. Sized in accordance with NFPA 70.

H. UL listed and conform to UL 489.

2.07 CONTROL CIRCUIT TRANSFORMER (CCT)

A. Dry type, copper windings, and sized to have adequate capacity for control power requirements of the motor control circuit.

B. Primary Voltage: 480 volts, 60 Hz..

C. Secondary Voltage: 120 volts, 60 Hz.

D. Integral fuse block mounted on transformer.

1. Primary and Secondary Fuses: Sized by manufacturer.

E. Transformer UL listed. Fuses conform to FU 1 and UL listed.

2.08 SELECTOR SWITCH

A. Bulletin 800T as manufactured by Allen-Bradley; Class 9001 as manufactured by Square-D; type CR104P as manufactured by General Electric; or equal, having the following essential characteristics:

1. Purpose: As shown on drawings.

2. Type: Heavy-duty, watertight/oiltight with 30.5 mm mounting hole.

3. Contact rating: NEMA A600.

B. Nameplate: Equipment manufacturer’s standard or custom engraved nameplate suitable for mounting directly over device.

C. Conform to NEMA ICS 5.

2.09 PUSHBUTTONS

A. Bulletin 800T as manufactured by Allen-Bradley; Class 9001 as manufactured by Square-D; type CR104P as manufactured by General Electric; or equal, having the following essential characteristics:

1. Type: Heavy-duty, watertight/oiltight with 30.5 mm mounting hole. Momentary or maintained contacts as required.

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2. Contact rating: NEMA A600,

3. START pushbutton: Momentary contact with black, flush button.

4. STOP pushbutton: Two-position, push-pull type with red mushroom head cap.

B. Nameplate: Equipment manufacturer’s standard or custom engraved nameplate suitable for mounting directly over device. Engraving as shown.

C. Conform to NEMA ICS 5.

2.10 INDICATING LIGHTS

A. Type: Heavy-duty, watertight/oiltight, push-to-test with 30.5 mm mounting hole. Full voltage for operation on 120 volt, 60 Hz.

B. Color:

1. Motor Running: Red.

2. Motor Not Running: Green.

C. Lamp:

1. High visibility, LED type, 120 volts, 60 Hz.

2. Minimum of 5 LEDs in a cluster. Lamps with one LED are not acceptable.

D. Nameplate: Equipment manufacturer’s standard or custom engraved nameplate suitable for mounting directly over device. Engraving as shown.

2.11 AUXILIARY RELAYS

A. Bulletin 700, type P as manufactured by Allen-Bradley; type M as manufactured by Eaton Cutler-Hammer; Class 8501, type X as manufactured by Square-D; or equal, having the following essential characteristics:

1. Type: Heavy-duty, self-resetting, machine tool relay with convertible contacts.

2. Latching type auxiliary relay to be electrically reset.

3. Contact rating: A600 in accordance with NEMA ICS 5.

4. Coil voltage: 120 volts, 60 Hz.

2.12 TIME DELAY RELAYS

A. IDEC Series RTE as manufactured by IDEC Corporation; Series CG as manufactured by Potter & Brumfield, Inc.; or equal, having the following essential characteristics:

1. Type: Solid-state.

2. Timing function and timing ranges as shown.

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3. Provide knob or dial for adjusting timing range.

4. Coil voltage: 120 volts, 60 Hz.

5. Configuration: DPDT.

6. Base: Octal pin type.

7. Options: Retainer clip or spring.

2.13 PANELBOARD

A. Type: Main lug only (MLO), 3-phase, 208/120 volt, 4-wire, 60 Hz.

B. Bus and Main Lug Rating: 100 amperes.

C. Branch Circuits: As shown on drawings.

D. Provide clear plastic directory cardholder on inside of door.

E. Accessories:

1. Copper ground bus.

2. Circuit Directory;

a. Show circuit breaker number and connected load.

b. Use machine lettering for directory entries. Hand written directory entries are not acceptable.

F. Suitable for mounting in motor control center.

G. Conform to NEMA PB 1 and be UL listed.

2.14 PANELBOARD TRANSFORMER

A. Type: General purpose, self-cooled, dry-type.

B. Winding Conductors: Copper.

C. Insulation: Class 180 degree C.

D. Winding Temperature Rise: 80 degrees C.

E. Primary Voltage: 480 volts, 3-phase, 60 Hz.

F. Secondary Voltage: 208/120 volts, 4-wire, 60 Hz.

G. kVA Rating: As shown on drawings.

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H. Primary Taps: Four 2.50 percent full-capacity below rated voltage and two 2.50 percent full-capacity above rated voltage.

I. Transformer Protection:

1. Primary: Circuit Breaker.

2. Secondary: Fuses.

J. Suitable for mounting in motor control center.

K. UL listed.

2.15 TERMINAL BLOCKS

A. Fixed Type:

1. Type EB-25 as manufactured by General Electric; 1600 Series as manufactured by Marathon Special Products, Buchanan catalog Nos. B104, B106, B108, and B112 as manufactured by Ideal Industries, Inc. ; or equal, having the following essential characteristics:

a) Molded one piece design with 4, 6, or 12 termination points.

b) Rating: 600 volts, 25 amperes, minimum.

c) Terminals: Binding-head or washer-head screws with serrated or grooved contact surfaces suitable for use with ring-type terminal connectors.

d) Full-size marking strips.

B. Pull-Apart Type:

1. Pull apart assembly with male and female component held together with captive screws.

2. Recess terminals to prevent accidental contact when withdrawn.

3. Stationary portion of terminal block to be used for factory connections and to remain attached to unit.

4. Rating: 600 volts, 10 amperes, minimum.

2.16 ENCLOSURE WIRE

A. 600 volt, stranded copper, type SIS.

B. Class K stranded in accordance with NEMA WC 70.

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C. Size: 16 AWG, minimum.

2.17 TERMINAL CONNECTORS

A. Type: Heavy-duty, preinsulated, pressure-crimp type with serrated inner barrel.

B. Style: Ring-tongue or pin type.

C. Compatible with conductor and termination point for which it is used.

D. UL listed.

2.18 WIRE AND CABLE MARKERS

A. Type: Machine-printable, tubular heat-shrink sleeve label.

B. Color: White.

2.19 NAMEPLATES AND LABELS

A. Provide manufacturer’s nameplates, engraved nameplates, and labels.

B. Manufacturer’s Nameplates. As a minimum provide:

1. Manufacturer’s name.

2. Required power supply (voltage, phase, frequency).

3. Load (amperes).

4. Short-circuit rating expressed in RMS symmetrical amperes.

C. Engraved Nameplates:

1. Provide nameplates of appropriate size and that conform to drawing 40-D-6234 using type A material.

2. Provide nameplate for overall motor control center and each compartment and plug-in unit, which describes function of compartment or plug-in unit.

D. Provide labels for terminal blocks. Labels to be white, adhesive type, and machine lettered with the single letter terminal block designation as shown on wiring diagrams.

2.20 FABRICATION

A. Structural and Mechanical Features:

1. Assemble sections using corrosion resistant hardware.

2. Connect vertical sections together to form rigid lineup.

3. Attach neoprene gaskets with oil-resistant adhesive.

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4. Provide barrier in incoming line compartment to prevent accidental contact with incoming lugs.

5. Mount switches, pushbuttons, meters, and indicating lights to be readily accessible and no higher than 78-inches above finished floor.

6. Mount motor overload reset pushbutton on door of contactor plug-in unit.

B. Internal Wiring:

1. Wire power and control circuits in accordance with approved drawings and as necessary for equipment to function as required.

2. Terminate circuits wired to external equipment on terminal blocks.

3. Make wire terminations with terminal connectors with ring tongues.

a. Use pin type connectors where the use of ring tongues is not practical such as terminations at selector switches, pushbuttons, indicating lamps, and auxiliary relays.

b. Do not use bare wire connections, except for motor power circuit conductors and power factor correction capacitor leads within the motor control center.

4. Keep exposed wiring to a minimum.

a. Where used, form wiring into compact groups bound together and firmly supported. Run straight, horizontally, or vertically with short-radius, right-angle bends.

b. Twist hinge wiring around longitudinal axis of wire, wherever practicable, instead of bending laterally.

5. Where wire leaves channel or duct, protect from abrasion. Provide grommets for holes used for wires and cables.

6. Do not splice wiring.

7. Make connections at device studs or terminal blocks.

8. Do not terminate more than two wires at each terminal point.

9. Make wiring between devices by most direct method. Do not loop back and forth across panels and between switchboard sections.

10. Use cable tie mounting bases to firmly support and secure exposed wire bundles.

a. Mount cable tie base with two No. 8 screws.

b. Do not mount cable tie bases with only an adhesive.

11. Arrange wires or groups on terminal blocks so that number of individual conductors associated with external cables can be minimized.

12. Use adjacent terminals for 3-phase leads and the neutral from each set of current and potential transformers.

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C. Terminal Blocks:

1. Pull-apart terminal blocks:

a. Use in plug-in units with NEMA size 2 motor contactors and smaller.

b. Terminals to be readily accessible from inside unit when unit door is open.

c. Terminations for field connections to be accessible such that connections can be made without removing the unit or its components.

d. Provide machine lettered conductor designations on the terminal block marking strips.

2. Fixed terminal blocks:

a. Use in motor starter compartments with NEMA size 3 motor contactors and larger.

b. Terminals to be readily accessible from inside unit when unit door is open.

c. Arrange such that external cabling can be supported.

d. Separate adjacent rows of terminal blocks at least 6-inches edge to edge.

e. Locate terminal blocks at least 3-inches from panel edges and other devices or items of equipment.

f. Identify vertical columns of terminal blocks with a single letter such as “A”, “B”, “C”, etc. Vertical terminal block columns may contain more than 12 termination points.

g. Provide machine lettered conductor designations on the terminal block marking strips.

h. Provide at least 6 spare terminal points in each motor starter compartment requiring fixed terminal blocks.

D. Nameplates, Legend Plates, and Labels:

1. Attach nameplates with cadmium plated, slotted, pan head self-tapping screws.

2. Attach legend plates for pushbuttons, indicating lights, and selector switches directly to the device.

3. Adhesive type labels may be used on wiring side of hinged equipment doors and back panels of motor control center compartments.

E. Cable and Wire Identification:

1. Provide computer-generated or labeling machine lettering.

2. Provide wire markers on both ends of each conductor. Wire marker to include conductor designation on the first line and conductor destination on second line.

A single line wire marker is acceptable provided the conductor designation is enclosed in parenthesis followed by the conductor destination.

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3. Conductor designation and conductor destination to be the same as shown on approved schematic and wiring diagrams.

4. Do not heat shrink wire marker onto conductor. Leave marker loose in order to easily rotate about the conductor.

2.21 FINISHES

A. Provide manufacturer’s standard interior and exterior coating.

2.22 SOURCE QUALITY CONTROL

A. Perform production tests in accordance with manufacturer’s standard shop and quality control procedures.

B. Test for correct operation and mechanical adjustment.

C. Perform AC dielectric test on power circuit in accordance with NEMA ICS 1.

PART 3 EXECUTION

3.01 CONTRACTOR FIELD QUALITY TESTING

A. At time of delivery, place equipment in temporary location as directed by COR and perform the following activities:

1. Assemble on solid surface, level, and provide temporary ground.

2. Provide at least one ground rod in accordance with NFPA 70.

3. Perform visual and mechanical inspections in accordance with NETA ATS.

4. Wiring checkout in accordance with Section 26 05 90 - Wiring Checkout and Tests.

5. Perform the following electrical tests in accordance with NETA ATS:

a. MCC bus: Dielectric withstand test.

B. After testing, cover equipment and store in accordance with manufacturer’s recommendations in location as directed by COR.

END OF SECTION