26 13 26.00 26 Amendment 0002.pdf

SECTION 26 13 26.00 26

METAL-CLAD SWITCHGEAR

09/17

PART 1 GENERAL

1.1 GENERAL INFORMATION

These specifications include the design, fabrication, factory testing, delivery, installation, field testing, and commissioning of the medium voltage switchgear lineup(s) as shown on the contract drawings.

1.2 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by basic designation only.

ASME INTERNATIONAL (ASME)

ASME B1.1 (2003; R 2018) Unified Inch Screw Threads (UN and UNR Thread Form)

ASME B1.20.1 (2013) Pipe Threads, General Purpose (Inch)

ASTM INTERNATIONAL (ASTM)

ASTM A123/A123M (2017) Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products

ASTM A153/A153M (2016) Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware

ASTM B187/B187M (2019) Standard Specification for Copper, Bus Bar, Rod and Shapes and General Purpose Rod, Bar and Shapes

ASTM D709 (2013) Laminated Thermosetting Materials

INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS (IEEE)

IEEE 1248 (1998; R 2007) Guide for the Commissioning of Electrical Systems in Hydroelectric Power Plants

IEEE C2 (2017) National Electrical Safety Code

IEEE C37.04 (1999; R 2006) Rating Structure for AC High-Voltage Circuit Breakers

IEEE C37.06 (2009) AC High-Voltage Circuit Breakers

Rated on a Symmetrical Current Basis - Preferred Ratings and Related Required Capabilities for Voltages Above 1000 V

IEEE C37.09 (1999; AMD 1 2005; Corr 1 2007; R 2007;

Errata 2007; Amendment B 2011) Standard Test Procedure for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis

IEEE C37.010 (2016) Application Guide for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis

IEEE C37.011 (2011) Application Guide for Transient Recovery Voltage for AC High-Voltage Circuit Breakers

IEEE C37.20.2 (2015) Standard for Metal-Clad Switchgear

IEEE C37.100 (1992) Standard Definitions for Power Switchgear

IEEE C57.13 (2016) Standard Requirements for Instrument Transformers

IEEE C57.13.3 (2014) Guide for Grounding of Instrument Transformer Secondary Circuits and Cases

IEEE C62.11 (2012) Standard for Metal-Oxide Surge Arresters for Alternating Current Power Circuits (>1kV)

IEEE C62.22 (1997; R 2009) Guide for the Application of Metal-Oxide Surge Arresters for Alternating-Current Systems

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)

NEMA CC 1 (2009; R 2015) Electric Power Connections for Substations

NEMA C37.55 (2002) Switchgear-Medium Voltage Metal-Clad Assemblies- Conformance Test Procedures

NEMA ICS 1 (2000; R 2015) Industrial Control and Systems - General Requirements

NEMA ICS 2 (2000; R 2005) Industrial Control and Systems Controllers: Contactors and Overload Relays Rated 600 Volts

NEMA LA 1 (2009) Standard for Surge Arresters

NEMA MG 1 (2016; SUPP 2016) Motors and Generators

NEMA SG 4 (2009; R 2013) Alternating-Current High-Voltage Circuit Breakers

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 70 (2017) National Electrical Code

INTERNATIONAL ELECTRICAL TESTING ASSOCIATION (NETA)

NETA ATS (2017) Standard for Acceptance Testing Specifications for Electrical Power Equipment and Systems

U.S. ARMY CORPS OF ENGINEERS (USACE)

EM 385-1-1 (2014) Safety and Health Requirements Manual

UNDERWRITERS LABORATORIES (UL)

UL 44 (2014; Reprint Feb 2015) Thermoset-Insulated Wires and Cables

UL 489 (2016) Molded-Case Circuit Breakers, Molded-Case Switches and Circuit-Breaker Enclosures

UL 1581 (2001; Reprint Jun 2017) Electrical Wires, Cables, and Flexible Cords

1.3 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. The following shall be submitted in accordance with Section 01 33 00, SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

Submit within 45 days after Notice To Proceed.

Work Plan; G HDC

Foundation Details; G, HDC

SD-02 Shop Drawings

Outline Drawings; G, HDC

Assembly and Detail Drawings; G, HDC

Schematic Diagrams; G, HDC

Point-To-Point Wiring Diagrams; G, HDC

SD-03 Product Data

Submit along with switchgear shop drawings:

Equipment Data; G, HDC

Characteristic Curves for Instrument Transformers; G, HDC

Surge Protection; G, HDC

SD-06 Test Reports

Submit no later than 30 days prior to tests:

Factory Test Procedure; G, HDC

Field Test Procedure; G, HDC

Submit no later than 10 days after the completion of the tests:

Factory Inspection and Test Reports; G, HDC

One certified electroniccopies of the reports of all tests, including complete test data submitted.

Submit no later than 30 days after completion of tests:

Field Test Reports; G, HDC

Five certified electroniccopies of the reports of all tests, including complete test data. Reports of all witnessed tests shall be signed by the witnessing representatives of the Contractor and the Government Quality Assurance Representative (GQAR). The costs of performing all tests shall be borne by the Contractor and shall be included in the prices bid for the items of equipment in the Schedules.

CT Burden Analysis; G, HDC

Design Test Reports; G, HDC

SD-07 Certificates

Submit within 60days after Notice To Proceed:

Certifications of Seismic Requirements

Submit within 60 days after Notice to proceed

Qualifications of Field Service Engineering Personnel; G, HDC

Qualifications of Installation Contractor; G, HDC

Submit within 60 days prior to training:

Qualifications of Instructor; G, HDC

Course Outline and Subject Matter; G, HDC

SD-10 Operation and Maintenance Data

Submit no later than 30 days prior to completion of work:

Operation and Maintenance Manuals; G, HDC

SD-11 Closeout Submittals

Submit not later than 60 days prior to completion of work:

Contractor Furnished Training of Government Personnel; G, HDC

Course Outline And Subject Matter; G, HDC

Submit within 30 days after completion of work:

As-Built Drawings; G, HDC

1.4 SWITCHGEAR DRAWINGS AND DATA

1.4.1 Shop Drawings

1.4.1.1 Outline Drawings

Outline drawings for coordination of equipment and physical location shall include the overall dimensions and weights of the equipment; the size and location of conduit and cable entrances; details of provisions for bolting equipment to the floor, walls, and ceilings; the equipment crate sizes and proposed routing to the installation site within the facility.

1.4.1.2 Assembly and Detail Drawings

Assembly and detailed drawings and data to demonstrate that all parts of the equipment will conform to the requirements and intent of the specifications. The drawings and data shall include sectional views of switchgear units, description of removable elements, all relays and other devices, equipment lists, and nameplate schedules.

1.4.1.3 Schematic Diagrams

Schematic diagrams shall show the one line diagrams of the switchgear assembly, three-line diagrams showing the switchgear showing the instrument transformers, relaying, and metering devices, and breaker control schematic logic showing that the equipment will function in a way to meet the requirements and intent of the specifications. All external controls and external connections indicated by the Contract drawings shall be accounted for.

1.4.1.4 Point-to-Point Wiring Diagrams

Wireless wiring diagrams shall be provided using wire destinations and device identifications. The Point to point wiring diagrams shall show all terminal blocks and connections between the blocks and switchgear equipment, and shall provide a space at least 3 inches below and adjacent to the terminal blocks in which external circuits, conduits or connections may be shown. The wiring diagrams shall be made as seen by an observer of the actual wiring, and space shall be provided for the addition of devices where mounting space exists on the structure. Drawings shall also show the proposed arrangement of terminal blocks and supports for incoming cables.

All external cable terminations as shown on the contract drawings shall be included on these wiring diagrams. The use of ladder logic type diagrams to indicate wiring connections is not acceptable in lieu of wiring diagrams.

1.4.2 Equipment Data

Equipment data for all equipment used in the switchgear assembly shall be submitted for approval at the same time the shop drawings for the switchgear are submitted. Manufacturer's data and catalog cuts to demonstrate fully that all parts to be used will conform to the requirements and intent of the specifications. A written description shall be furnished for each electrical device or system describing the operation or sequence of operations of the component parts. The submittal package shall be arranged with a full table of contents identifying each part and associated page number. Each part shall be located in a separately tabbed section. All data shall be legible and clearly identified with the part intended to be used.

As a minimum, submittals shall be required for the following:

a. Circuit Breakers.

b. Instrument Transformers, characteristic curves, and ancillary equipment.

c. Switchgear cubicles and ancillary equipment.

d. Bus Insulation System.

e. Control Swtiches.

f. Indicating Lights.

g. Wire and Cable.

h. Terminal Blocks.

i. Nameplates.

j. Surge Arresters and Capacitors.

k. Auxiliary and Interposing Relays.

l. Meters, data for each type installed..

m. Protective Relays.

n. Infra-Red Viewing Windows.

o. Trip Coil Monitor.

p. Capacitive Trip Device.

q. Remote Racking Device.

r. Accessories and Spare Parts List.

1.5 DELIVERY, STORAGE, AND HANDLING

a. Provide written notification to the Government21 calendar days prior to shipment of equipment.

b. The switchgear shall be shipped as completely assembled and wired as feasible. The switchgear and any other equipment shall be wrapped suitably or otherwise protected from damage during shipment. All electrical material delivered to site, shall until installation, be protected from damaging environmental and construction activities. The equipment shall be kept dry and free from precipitation and condensation during storage, installation, and after installation. All electrical equipment shall be stored in completely enclosed containers and in a humidity-controlled environment. Method of on-site storage and storage containers will be subject to approval by the CO The Contractor shall have a representative on site during all deliveries to verify the condition of all equipment received and to ensure the equipment is handled per the manufactures instructions for unloading.

The Contractor will be required to dispose of all shipping crates, skids and packing materials.

1.6 QUALIFICATIONS OF MANUFACTURER

Each manufacturer shall have a minimum of five years experience with the production of equipment of the same type and rating. The switchgear manufacturer shall be the same as the breaker manufacturer. All switchgear furnished under this specification shall be by the same manufacturer.

1.6.1 QUALIFICATIONS OF INSTRUCTOR

Instructor: Factory-authorized service representative familiar with the site, experienced in operation and maintenance procedures and training.

1.7 DESIGN COORDINATION

The Contractor is required to accomplish all design coordination between manufacturers of the new switchgear, installation subcontractors, and the COR, in order to provide assurance to the Government that critical requirements are met and that the switchgear can be transported and installed within the physical access constraints of the powerhouse without disassembly of the delivered equipment.

1.8 MATERIALS AND EQUIPMENT

New materials and equipment shall be furnished and any defective material or equipment damaged in the course of shipment and installation shall be replaced or repaired to original condition. Testing shall be performed to check the installation of and the proper operational functions of the electrical equipment.

1.8.1 Standard Products

Material and equipment shall be the standard products of manufacturers regularly engaged in the manufacture of these products and shall essentially duplicate items that have been in satisfactory use for at least two years prior to bid opening.

1.8.2 Corrosion Prevention

1.8.2.1 General

All equipment shall be protected to prevent deterioration from corrosion.

The general requirements are specified below; however, other corrosion-resisting treatments that are the equivalent of those specified may be used.

1.8.2.2 Fastenings and Fittings

Screws, bolts, nuts, pins, studs, springs, washers and other miscellaneous fastening and fittings shall be of corrosion-resistant material or shall be treated in an approved manner to render them resistant to corrosion. All fastenings which are to be exposed directly to the weather shall be of corrosion-resisting material.

1.8.2.3 Corrosion-Resisting Materials

Corrosion-resisting steel, copper, brass, bronze, copper-nickel-copper alloys are acceptable corrosion-resisting materials.

1.8.2.4 Corrosion-Resisting Treatments

Treatments shall be in accordance with ASTM A123/A123M or ASTM A153/A153M.

1.8.2.5 Finish

Final painting shall be done in accordance with paragraph "PAINTING".

PART 2 PRODUCTS

2.1 GENERAL REQUIREMENTS

2.1.1 Materials, Components, and Equipment

All materials, components, and equipment shall conform to the requirements of these specifications. Materials, components, and equipment shall be new and free from defects and imperfections, of recent manufacture, and shall have mechanical and electrical properties suitable for the intended use.

All materials, components, and equipment not manufactured by the Contractor shall be products of other recognized reputable manufacturers meeting the requirements of paragraph "Qualifications". Insofar as practicable, devices and equipment used for the same or similar services shall be of the same make and type, and shall be interchangeable when of the same rating.

2.1.2 Code Compliance

The equipment furnished and the work performed under this Contract shall be in conformance with the applicable provisions of IEEE C37.20.2, IEEE C37.04, IEEE C37.06, IEEE C37.09, ,IEEE C37.010, and NEMA C37.55.

2.1.3 Device Arrangement

The preferred arrangement of devices to be mounted on the switchgear is indicated on the Contract drawings. Any proposed deviation from this arrangement shall be submitted to the CO for approval. The design of the switchgear and arrangement of devices shall be such that adequate space is provided for inspection and maintenance of wiring, terminals, and devices.

Equipment on the rear of the panels shall be so mounted that the studs of the equipment mounted on the front of the panels will be accessible without removing any device.

2.1.4 Connections

All bolts, studs, machine screws, nuts, and tapped holes shall be in accordance with ASME B1.1. Threads for sizes 1/4 inch to 1 inch, inclusive, shall be NC or UNC series. The sizes and threads of all valves, pipe and fittings, conduit and fittings, tubing and fittings, and connecting equipment shall be in accordance with ASME B1.20.1.

Manufacturer's standard thread and construction may be used on small items which, in the opinion of the GQAR, are integrally replaceable, except that threads for external connections to these items shall meet the above requirements.

2.2 SWITCHGEAR AND CIRCUIT BREAKER RATINGS

2.2.1 Switchgear Ratings

The metal-clad switchgear shall have the following ratings:

Rated Maximum Voltage (kV): 5

Rated Power Frequency (Hz): 60

Rated Power Frequency Withstand (kV): 36

Rated Lightning Impulse Withstand (BIL)(kV): 60

Rated Continuous Current (A): 1200

Rated Momentary Withstand Current(kA): 135

Rated Short-time Withstand Current (kA): 25

2.2.2 Circuit Breaker Ratings

Each feeder and generator circuit breaker shall be an electrically-operated, metal-clad, with vacuum type interrupters, and for indoor 60-Hz service. The circuit breakers shall be rated on a symmetrical current basis and shall have characteristics in accordance with Table 1 of

IEEE C37.06 and IEEE C37.04 as follows:

a. Rated Maximum Voltage, kV, rms 5 kV

b. Rated Continuous Current, Amps, rms 1200 A

c. Rated Interrupting Time, cycles 3

d. Rated Short-Circuit Current, kA, Amps, rms 25

e. Closing and Latching Capability, kA, peak 65

f. Impulse withstand Voltage, full wave, kV (BIL) 60

2.3 SWITCHGEAR

2.3.1 Service Conditions

The switchgear will be located indoors within ambient temperature extremes of 0 degrees C to +40 degrees C. The switchgear will be installed at an altitude below 1,000 feet. The entire assembly shall have seismic equipment certification and equipment anchorage as specified in Section

13 48 00.00 26, SEISMIC RESTRAINT FOR MECHANICAL AND ELECTRICAL EQUIPMENT .

2.3.2 Configuration

The switchgear shall be metal-clad drawout cubicle switchgear configured as indicated on the Contract drawings with 26-inch width sections as shown or as determined by manufacturer. The standard phasing within equipment housings for AC power circuits shall be A-B-C from left to right, A-B-C from top to bottom, or A-B-C from front to back, when facing the front of the equipment. Power cables in conduit will enter the switchgear as shown in the drawings. Where power cable terminations are indicated, sufficient space shall be provided for terminating the cables with medium-voltage cable terminations. Each breaker shall have provisions for remote close and trip operations with a pendant control. Provisions for cable and pendant controlled electrically operated remote racking device shall be provided for each breaker cubicle, and each breaker cubicle shall be equiped with integral racking equipment such that the circuit breaker may be tripped and racked from the connected position to the disconnected position and vice versa while the cubicle door remains closed and latched.

2.3.3 Removable Elements

The removable element of each switchgear unit shall consist of a 3 pole interrupter type circuit breaker, with an operating mechanism, primary and secondary disconnecting devices, auxiliary switches, operation counter, position indicator, and control wiring, all mounted on a rugged frame suitable for moving the element. If the frame is not equipped with wheels, it shall be suitable for supporting and removing the element from the housing by means of a special truck furnished with the accessories as described in paragraph "ACCESSORIES". Each of the three poles shall be an independently sealed vacuum interrupter. The mechanism for removing the breaker for drawout switchgear shall provide for moving the circuit breaker from the operating to the disconnected position. All primary contacts shall be silver-plated and shall have ample contact area and spring pressure. Contact parts which carry current shall not be used to supply contact-spring pressures. When the circuit breakers are withdrawn to the disconnect position, the circuit breaker primary contacts shall be withdrawn completely from the fixed contact enclosure and automatic shutters shall close the openings to prevent accidental contact with live terminals. All stationary secondary contacts shall be readily accessible and shall be adequately identified to facilitate connection with the control cables.

2.3.4 Housing

The following requirements apply to new switchgear housings.

a. Each switchgear unit shall be enclosed in a self-supporting dead-front fabricated housing constructed of sheet metal on a rigid steel frame and provided with metal partitions or barriers as required. The sheet metal forming the enclosure for the removable element and the barriers between major primary sections shall not be less than No. 11 MSG. Exterior panel surfaces shall be free from holes, seams, dents, weld marks, loose scale, or other imperfections, and shall not be drilled or welded for attachment of wiring, resistors, or other devices where such holes or fastenings will be visible from the exterior. All ferrous fasteners shall have a rust-resistant finish, and all bolts and screws shall be provided with lock washers or other approved locking devices. The hinges for all doors shall be of the fully-concealed type. Stops shall be provided where required to limit door swing and prevent damage to hinges or adjacent equipment. The clearance between any edge of a hinged door, when closed, and the adjacent panel shall be uniform and shall not exceed 1/8-inch. Each door shall be supplied with a 2-point vault type latch with handles of the key-locking type with identical keying with that of other switchgear enclosure and ten keys of each type furnished.

b. Ventilating openings shall be provided as required for proper ventilation. The openings shall preferably be of the grille type, and shall be provided with corrosion-resistant insect-proof screens on the inside.

c. The housing for each removable circuit breaker element shall include a hinged front, separate three-phase bus, bus terminating compartments, a self-contained mechanism for removing the circuit breaker from switchgear, primary and secondary disconnecting devices, automatic shutters, and mechanical interlocks. The housing structure and the removable element shall be self-aligning and shall be designed in such a manner as to ensure a good mechanical fit between the two and to permit the circuit breaker removable elements of the same rating to be interchanged.

d. Lifting eyes shall be provided at locations suitable for lifting the entire drawout switchgear section.

e. Transition compartments, if required to connect to metal enclosed bus, shall be provided to connect the bus enclosure to the switchgear.

The internal buses shall have continuous current carrying capacities and momentary ratings not less than required for the adjacent buses.

f. Circuit breaker cubicles shall have breaker rackout mechanisms for racking the breaker into position. The rackout mechanism will properly align the breaker for insertion into position. It will hold the breaker rigidly in the operating position. In the disconnected position, breaker shall be easily removable from compartment. Breaker racking shall be accomplished with door closed and latched. Insert handle through a hole in front door to operate rackout device. Provide both a manual rackout lever and an electrically operated remote racking device. The remote racking device shall be capable of racking the breaker from the fully disconnected position to the operating position, with the door closed and latched. The remote racking device shall allow the operator to stand at least 20 ft. from the breaker when the breaker is being racked in or out.

g. Infra-red (IR) viewing windows shall be provided on the rear of the switchgear enclosures, minimum one window for each main bus breaker lug connection and each bus tie circuit breaker lug connection, to allow IR sensing of each breaker in the closed position under load conditions without having to open the enclosure. Windows shall feature a removable steel or aluminum security cover over a 4-inch crystal sightglass.

Windows shall also be provided for each feeder breaker, unless the switchgear manufacturer can show that such installation is impractical due to the design of the bus-breaker connections. Windows shall be on the front or rear of the enclosure as recommended by the manufacturer for optimum viewing. The IR windows shall be the switchgear manufacturer's standard product, or a third-party product that is UL certified and arc-flash tested to the kA rating of the breakers or higher and installed with the coordination and approval of the switchgear manufacturer.

2.3.5 Buses

2.3.5.1 General

The primary buses for each switchgear assembly shall meet the applicable requirements of ASTM B187/B187M and shall have a continuous current carrying capacity not less than that shown in paragraph 2.2.1 "Switchgear Ratings" and as shown on the drawings.

2.3.5.2 Design

The buses shall have mechanical and thermal capacities coordinated with the highest momentary rating of the individual circuit breakers. Bus bars shall be of hard drawn copper.

2.3.5.3 Splices and Connections

All splices for field assembly shall be bolted. Where bolted connections are used, they shall be equipped with provisions for adequate clamping and contact surfaces shall be silver plated.

2.3.5.4 Insulation

Each phase conductor shall be completely enclosed with molded insulation that will withstand the dielectric requirements of paragraph 2.2.1 "Switchgear Ratings". Molded neoprene boots with nylon fasteners of equivalent mechanical and electrical strength as that enclosing the bus shall be provided at bus joints. Taped insulation shall not be used at bus joints. The buses with molded insulation shall be mounted on insulating supports, and shall pass through barriers between individual unit housings.

2.3.5.5 Grounding Studs

The buses shall have 1inch diameter tin-plated copper grounding ball studs located at an easily accessible location in the rear of the switchgear for installation of personnel grounds. Grounding stud covers shall be furnished for all grounding studs.

2.3.5.6 Access

Removable metal plates or bolted hinged doors at each unit housing shall be provided for access to the bus compartment.

2.3.6 Ground Bus

Each switchgear assembly shall include a continuous interior copper bar ground bus to which the housing, framework, cable and bus supports, and noncurrent-carrying metallic parts of all equipment and conduits shall be grounded. Grounding shall conform to IEEE C37.20.2, except that the ground bus bar shall be not less than 1/4-inch by 1-inch in size. Splice plates and hardware shall be provided for bolted connections at shipping splits (if shipping splits are required) for the ground bus. All contact surfaces shall be tinned or silver-plated. Two grounding pads shall be provided, one at each end of the switchgear or circuit breaker. Each shall have a minimum of two tapped holes (NEMA 2 or 4-hole configuration) with a matching copper or bronze, long barrel 2 or 4 hole compression lugs or clamp type terminal for a stranded 500 kcmil copper ground conductor.

Grounding pads and terminals shall comply with NEMA CC 1.

If the operating mechanism of removable units is not permanently grounded, ground contacts shall be provided to connect the movable element automatically to the ground buses. These connections shall make before the main disconnecting devices upon insertion, and break after the main disconnecting devices upon withdrawal.

2.3.7 Interlocks

2.3.7.1 Mechanical Interlocks

Mechanical interlocks shall be in accordance with IEEE C37.09 requirements and as follows:

a. Mechanical interlocks shall prevent moving the removable elements to or from the connected position when the switching device is in the closed position, and prevent closing the switching device unless the primary disconnection devices are in full contact or are separated by a safe distance.

b. The removable element shall be positively held in place within the housing when it is in either the connected or test position.

c. When a separate disconnected position is provided with the door closed, the removable element shall be positively held in this position. In addition, the circuit breaker shall not be operable while the removable element is at any point between test and operating position.

d. The stored energy element shall not release unless the mechanism has been fully charged and it shall be automatically discharged before the circuit breaker is withdrawn from the housing.

2.3.7.2 Electrical Interlocks

Electrical interlocks shall be wired to include circuit breaker status contacts using breaker auxiliary contacts or mechanism operated contacts (MOC) and breaker position contacts using truck operated contacts (TOC)as shown on the contract drawings.

2.3.8 Device Arrangement and Marking

The design of the switchgear and arrangement of devices shall be such that adequate space is allowed for inspection and maintenance of wiring, terminals and devices. Equipment on the rear of the panels shall be so mounted that the studs of the equipment mounted on the front of the panels will be accessible without removing any device. Each device mounted on or inside the switchgear shall be identified by a device designation marked on the device or on the panel adjacent to the device. These designations are in addition to the device identification nameplates located on the front panels. Each terminal of each device to which a connection is made shall also be marked with a distinct terminal marking which corresponds with the terminal marking shown on the Contractor's schematic and connection diagrams. The device and terminal markings shall be of permanent legible printed form in a color which contrasts with the color of the device or panel and shall not be obscured by wires or other devices. Nameplates on front panels shall be as described in paragraph ESCUTCHEONS AND NAMEPLATES of Section 26 05 00.00 26, BASIC ELECTRICAL MATERIALS AND METHODS.

2.3.9 Terminal Blocks

2.3.9.1 General

Terminal blocks for control wiring shall be molded or fabricated type with barriers, rated not less than 600 volts.. The terminals shall be removable binding, fillister or washer head screw type, or stud type with contact and locking nuts. The terminals shall be not less than No. 10 in size and shall have sufficient length and space for connecting at least two indented ring tongue terminal connectors for No. 10 AWG conductors to each terminal. The terminal arrangement shall be subject to approval. Not less than 10 percent, but in no case less than 2, spare terminals shall be provided on each block or group of blocks. No push-in grip style terminal blocks shall be used. High density modular terminal blocks are not acceptable.

2.3.9.2 Short-Circuiting Terminal Blocks

Short-circuiting type terminal blocks shall be furnished for all current transformer secondary leads. The terminal blocks shall have factory designed provisions for shorting together all leads from each current transformer using shorting screws so that it can be shorted without first opening the circuit. Whenever possible these terminal blocks shall be made by the same manufacturer as the terminal blocks for control wiring listed above.

2.3.9.3 Marking Strips

White or other light-colored plastic marking strips, fastened by screws to each terminal block, shall be provided for control, instrument and relay wire designations. The manufacturer's wire number and the Government's wire number shall both be printed for each connected terminal on the marking strips with permanent marking fluid. Hand-written marking strips will not be accepted. The marking strips shall be reversible to permit marking both sides, or two marking strips shall be furnished with each block, to accommodate the two sets of wire numbers.

2.3.10 Wiring

In addition to the requirements for Special Wire and Cable in Section 26 05 19.00 26, INSULATED WIRE AND CABLE switchgear wiring shall meet the following requirements:

2.3.10.1 Control Wire

All control wire, including wire for removable elements, shall be stranded copper switchboard wire with 600 volt insulation, type SIS as listed in NFPA 70. The wire shall comply with the requirements of UL 44 and shall pass the VW-1 flame test of UL 1581. Hinge wire shall have Class K stranding. Current transformer secondary leads shall be not smaller than No. 10 AWG. Voltage transformer secondary leads shall be not smaller than No. 12 AWG. Minimum wire size for all other control wiring shall be No.14

AWG.

2.3.10.2 Wiring Duct System

A suitable wiring duct system shall be installed for all interpanel wiring and shall provide easy access for inspection and replacement of wiring.

All wiring shall be installed in wiring channels and ducts as far as possible. Each wire shall be properly protected where it leaves a channel or duct.

2.3.10.3 Other Wiring

Wiring, where not installed in channels or ducts, shall be formed into compact wire bundles suitably bound together and properly supported.

Bindings and supports shall not cause damage or cold flow of the insulation. Groups of exposed wires shall be run straight horizontally or vertically with short-radius right-angle bends. Wiring supports shall be of heavy-gage rustproof material or steel with rust-resisting finish equivalent to sherardizing or cadmium-zinc plating.

2.3.10.4 High-Voltage Compartment Control Wiring

Any control wiring within high-voltage compartments shall be completely shielded in a protective metal enclosure or raceway. Interpanel terminal blocks shall be used for interconnecting the wiring between adjacent panels at shipping splits. Hinge wire shall be used between stationary panels and swinging panels or swinging doors and shall be formed in vertical wire loops which shall provide rotation around the longitudinal axis of the conductors. Instrument transformer secondary circuits shall be grounded at the switchgear during shipping and handling. All leads from each individual instrument transformer shall be brought out to terminal blocks.

2.3.10.5 Current Transformer Secondary Leads

All current transformer secondary leads shall be routed through metal conduits separately from all other wiring, to short-circuiting terminal blocks in the control cabinet or in a separate cabinet. Current transformer terminal blocks shall be isolated by barriers from operating mechanism and control circuits if they are in the control cabinet.

2.3.10.6 Terminal Blocks and Internal Wiring

Terminal blocks and internal wiring shall be provided for all breaker spare auxiliary contacts and control device spare contacts for the connection of remote circuits. Terminal blocks shall be provided to terminate all external cables and shall contain at least 10 percent spare terminals.

Suitable provisions shall be made for training and supporting incoming cables from the point of entrance to their termination on terminal blocks.

All terminal blocks shall be accessible from the front of the switchgear unit with the front door open and the circuit breaker in the operate position. Special attention shall be given to wiring and terminal arrangement to permit the individual conductors of an external cable to be conveniently grouped for connection to adjacent terminal points. Suitable entrance locations shall be indicated on the Contractor's Assembly and Detail Drawings for entrance of all external control cables.

2.3.10.7 Splices and Wire Terminals

There shall be no splices in the wiring and all connections shall be made at terminal studs or terminal blocks with insulated ring-tongue indented terminals.

2.3.10.8 Wire or Terminal Point Designations

Each conductor shall be identified at each end with a permanently machine-embossed black identification on white plastic tubular shrink-on marker and as shown on the connection diagram terminal blocks. The wire or terminal point designations used on the Contractor's wiring diagrams and printed on terminal block marking strips may be according to the Contractor's standard practice; however, additional wire and cable designations for identification of remote or external circuits shall be required, and Schematic Diagrams and Connection Diagrams submitted for approval will be so marked and returned to the Contractor for additional designations. Drawings may require revision of external circuit connections, terminal and wire designations and wire grouping when submitted for approval.

2.3.11 Power Bus Cable Entry and Terminations

Power bus and cables will enter the switchgear as indicated on the drawings. Cable entrance locations shall be indicated on the Contractor's shop drawings for drilling in the field by the Contractor. Long barrel 2 or 4 hole compression lugs shall be furnished for terminating the cables and sufficient space shall be provided for installation of medium-voltage cable terminations. See conduit and cable schedule in drawings for the conductor sizes.

2.3.12 Foundations

2.3.12.1 General

Provide equipment steel channel foundations for all equipment. All foundations shall be suitable for the dynamic switching forces of the circuit breaker and the specified seismic forces. Anchorage shall be as per Section 13 48 00.00 26, SEISMIC RESTRAINT FOR MECHANICAL AND ELECTRICAL EQUIPMENT. Certifications of Seismic Requirements shall be submitted per Section 13 48 00.00 26, SEISMIC RESTRAINT FOR MECHANICAL AND ELECTRICAL EQUIPMENT. Housekeeping pad removal or construction shall be coordinated and approved.

2.3.12.2 Foundation Details

Submit foundation details for installing channel sills in floors or housekeeping pads including block-out sizes and spacing as indicated in the "Details" drawings.

2.3.13 Nameplates

Each item of equipment mounted on the switchgear which does not have a suitable designation included as an integral part of the device shall be provided with an engraved nameplate or with other approved suitable means of identification. Nameplates shall meet the following requirements:

a. Nameplates made from melamine plastic conforming to ASTM D709.

b. Nameplates must be 0.125 inch thick, black with white center core.

Surface must be matte finish. Corners must be square. Accurately align lettering and engrave into the core. Minimum size of nameplates must be 1 inch by 2.5 inches. Lettering must be a minimum of 0.25 inch high, normal block style.

c. Plates must be fastened with black-finished or silver-finished, corrosion-resisting, round-head machine screws or approved nonadhesive metal fasteners.

d. Spare locations, such as spare breakers, must have blank nameplates installed, that can be engraved in the future.

2.4 CIRCUIT BREAKER

2.4.1 General

Except as otherwise specified, the circuit breakers shall conform to the applicable requirements of ANSI and/or IEEE Standards; IEEE C37.04, IEEE C37.06, IEEE C37.09, IEEE C37.010,,IEEE C37.20.2,NEMA C37.55, and IEEE C37.100. Provide documentation substantiating that the circuit breaker design and assemblies are ANSI certified. Each circuit breaker shall be of the electrically operated, metal-clad, vacuum type suitable for indoor 60-Hz service. The full-load temperature rise shall not exceed the limits established in IEEE C37.20.2. The circuit breakers shall be rated on a symmetrical current basis. Ratings shall be as defined in IEEE C37.04 Part 5, and as supplemented below.

2.4.2 Breaker Assembly

2.4.2.1 General

The assemblies shall consist of a 3-pole vacuum interrupter type circuit breaker, with an operating mechanism, primary and secondary disconnecting devices, auxiliary switches, operation counter, position indicator, and control wiring, all mounted on a rugged frame with wheels suitable for moving the removable element.

2.4.2.2 Interrupter

The vacuum interrupters shall be factory assembled. Three poles shall be independently sealed, needing no interior maintenance or repairs to be performed after installation. The interrupters shall be equipped with arc-extinguishing devices to quench the arc after current zero and shall provide a minimum of 10,000 operations before replacement is needed. The interrupter shall have ready means of measuring contact wear.

The interrupter contacts shall be protected from moisture and contaminated atmosphere. The three poles and auxiliary devices of each circuit breaker shall be operated simultaneously by a single operating mechanism from a common shaft. The operating system capacity shall be sufficient to perform repeated operating cycles, using a combination of initial stored energy and recharged stored energy, as required below, without mis-operation or thermal or mechanical damage. The circuit breaker, operating mechanism and control design shall permit any close or trip switches to remain closed for any length of time without causing damage or mis-operation.

2.4.2.3 Interrupter Lock

The interrupter shall have provisions for locking the interrupter into the open position for maintenance purposes.

2.4.3 Rated Transient Recovery Voltage

Each circuit breaker shall meet the related required transient voltage withstand capabilities as described by IEEE C37.04 paragraph 5.9.1.1, IEEE C37.09 and IEEE C37.011.

2.4.4 Load Switching Capacity and Life

Required load switching capability and life shall be in accordance with IEEE C37.04 paragraph 5.8.2.3 and with the following:

a. Each breaker shall be capable of performing without maintenance or adjustment, 2,000 no-load operations as prescribed in Column 4 of Table 17 per IEEE C37.06 during time periods (between scheduled breaker maintenance) of up to 10 years, when operated under the specified service conditions.

b. Each breaker shall be capable of interrupting without maintenance, at least 1000 close-open (CO) operations under full load conditions as prescribed in Column 6 of Table 17 per IEEE C37.06.

c. Each breaker shall be capable of performing without maintenance, three close-open (CO) operations at full rated interrupting currents.

Procedures and test duties shall be in accordance with IEEE C37.04 paragraph 5.8.2.5.

2.4.5 Rated Control Voltage

Rated control voltage ranges shall be 100-140 volts dc for the close control circuit, and 70-140 volts dc for the trip control circuit in accordance with IEEE C37.06 Table 18. Further, operation of the closing and tripping control circuits shall not produce transient overvoltages exceeding 1,500 volts crest.

2.4.6 Operating Mechanism

2.4.6.1 General Operating Requirements

The three poles of each circuit breaker shall be operated simultaneously by a single operating mechanism from a common shaft. The circuit breakers shall be designed for normal operation by means of a motor-spring type, stored-energy closing operator with trip coil and shall also be provided with manual maintenance closing and emergency tripping devices. The circuit breakers shall be equipped with lockout-tagout capabilities. Manual maintenance closing shall include a slow closing feature. The operating mechanism shall be non pumping and electrically and mechanically trip-free, in all positions of the closing stroke. The mechanism shall be removable without disturbing the alignment or adjustment of current-carrying parts of the circuit breakers. Each mechanism shall operate a position indicator which shall give positive indication of the contact position, whether closed or open. Each circuit breaker shall be equipped with an operation counter and an auxiliary switch assembly providing, in addition to the contacts shown and required for breaker control, not less than four spare electrically-independent single-pole contacts which can be changed readily to "circuit opening," or to "circuit closing," as required. The breaker shall have not less than 24 contacts actuated by a breaker Mechanism Operated cell (MOC) switch. MOC contacts shall be 12 "circuit opening" 12 "circuit closing". Additionally, a truck operated cell (TOC) switch that operates when the breaker is racked in or out of the operating position shall also be furnished with not less than four normally closed and four normally open contacts. The normally open contacts shall be open when the breaker is racked in and closed when the breaker is in the test or racked out position. The normally closed contacts shall have opposite status to normally open contacts. Breaker closing time, when the breaker is operated from a control switch at rated control voltage, shall not exceed 3 cycles.

The circuit breaker closing mechanism shall be so arranged that the closing speed of the contacts is independent of the control voltage. The stored-energy mechanism shall normally be charged by a small motor, but shall also have provisions for manually charging the spring.

2.4.6.2 Mechanical Requirements

The operating mechanism shall be designed to provide continuous operating force through the entire range of motion, in either breaker close or open direction. The mechanism shall be designed and manufactured to withstand all operating stresses. Bearings, pins, bolts, nuts and other connections shall be locked and pinned in a manner to prevent loosening or change of adjustment. The operating mechanism shall not require critical adjustments, and failure of any spring (other than the operating energy storage spring, where applicable) shall not prevent tripping nor cause tripping or closing of the circuit breaker. The mechanism shall contain a shock absorber system to dampen the opening force of the circuit breaker.

The shock absorber shall have sufficient resilience to prevent contact bounce that could cause a re-strike of the main contacts during the opening of the circuit breaker or during a spring discharge. The shock absorber shall have a design life of 10,000 breaker opening and closing cycles without the need for repair, replacement or adjustment. All bearings which require periodic applications of grease shall be equipped with pressure type grease fittings unless otherwise approved by the Government.

2.4.6.3 Operating Capacity

The operating mechanism shall perform repeated operating cycles using a combination of initial stored energy and recharged stored energy as required below, without misoperation or thermal or mechanical damage. The operating mechanism shall be capable of performing the following operating sequences without thermal or mechanical damage, while the circuit breaker is operating at rated short circuit current and related required capabilities:

a. The standard ANSI duty cycle as indicated in IEEE C37.09 for generator rated circuit breakers shall be provided.

b. Each motor-charged spring operated mechanism shall meet the duty cycle of Open-Close-Open, 30 seconds, Close-Open. At least 5 successive Close-Open operations shall be possible without overloading the spring charging motor. The mechanism shall have provisions for manually charging the springs.

2.4.6.4 Energy Supply and Storage Means

The spring charging system, including motor, and the operating mechanism shall be located on the roll out breaker. A suitable means shall be provided to prevent operation of the mechanism when maintenance work is being done.

a. The motors for spring charging shall be nominal 125-volt dc types designed for across-the-line starting and suitable for operation through a range of 70 to 140-volts dc. Each motor shall either be capable of continually withstanding locked-rotor current without damage, or shall be provided with manually-reset thermal overload protection in each ungrounded line. The motors shall conform to the applicable provisions of NEMA MG 1 and the motor controls shall comply with the applicable provisions of NEMA ICS 1 and NEMA ICS 2.

b. Special Requirements for Electric Motor Driven Spring Mechanisms.

The state of charge shall be clearly visible by spring position indicators. Spring charge shall occur only after a close operation, or, an adjustable delay of 0 to 2 seconds may be provided to allow staggered recharge between multiple breakers at a given site.

2.4.6.5 Operating Mechanism Indicators

The following indicators shall be provided and shall be readable from one central location with the housing closed.

a. Circuit breaker position. These indicators shall give positive information of the position of the contacts, whether closed, open, or in an intermediate position.

b. Operation counter. The counter shall be directly operated by the mechanism when the circuit breaker opens, and shall not be affected by cycling power to control circuits.

c. A spring charge indicator shall be provided for any springs used to store operating energy. This shall be easily readable when the housing door is open.

2.5 CONTROLS AND CONTROL EQUIPMENT

2.5.1 General

a. All control equipment immediately associated with the circuit breaker operation shall be mounted directly on the circuit breaker assembly (or on the stationary structure) in a readily accessible location for testing and maintenance. The control equipment arrangement shall be such as to cut off the closing or tripping current as soon as the operation is completed and prevent pumping of the circuit breaker in case of automatic tripping or mechanical failure of any kind. Indicating lamps visible from the front with the door closed shall be connected for each breaker to give a red indication for breaker closed position and a green indication for breaker open position. Each circuit breaker shall be provided with a local test control switch which shall be located within the housing and shall be effective only when the breaker is in the test or disconnected position. The control schemes shall incorporate all features indicated by the control schematics, as shown on the drawings, and existing plant controls.

b. The control power for the breakers shall be from a 125 volt DC source. Furnish and install the necessary control bus or cabling to distribute this control power to the individual switchgear units as shown on the drawings. Each power circuit breaker shall be provided with one 2-pole molded-case circuit breaker located at the control benchboard and one 2-pole molded-case circuit breaker located at the switchgear for 125 volt DC, conforming to paragraph "Molded Case Circuit Breakers" for disconnecting the breaker control source for that unit and for protection of associated circuit and devices as shown.

The molded-case circuit breakers shall be lockable in the open position.

c. Provide a mimic bus on the control benchboard to diagrammatically show the internal bus structure of the switchgear lineup. Match existing material, color, and appearance for new mimic bus required for new feeder breaker.

2.5.2 Additional Control Requirements

Breaker control switches shall be provided as shown in the contract drawings. The control switches on the front of the breaker panel shall only control the breaker when the breaker is in the racked out position.

b. The trip circuit shall be capable of isolation from all other circuits. All external connections for the trip circuit, including power, shall be terminated on terminal block points separate from those of other circuitry. Any interconnections with other control circuits shall be made from those terminal points.

c. The operating mechanism counter described in paragraph General

Operating Requirements and the…