Amend 0003_26 05 00.00 26.pdf

PH1 Cubicle Room 15kV Switchgear Upgrade, Fort Peck Dam, MT FP66

SECTION TABLE OF CONTENTS

DIVISION 26 - ELECTRICAL

SECTION 26 05 00.00 26

BASIC ELECTRICAL MATERIALS AND METHODS

PART 1 GENERAL

1.1 DESCRIPTION OF WORK

1.2 REFERENCES

1.3 SUBMITTALS

1.4 DESIGNER QUALIFICATIONS

1.5 GENERAL REQUIREMENTS

1.5.1 Materials, Equipment and Installation

1.5.2 Standard Products

1.5.3 Corrosion Prevention

1.5.3.1 General

1.5.3.2 Fastenings and Fittings

1.5.3.2.1 Corrosion-Resisting Materials

1.6 DELIVERY, STORAGE, AND HANDLING

1.7 CONTRACT DRAWINGS

1.7.1 General

1.7.2 Departure From Drawings

1.7.3 Drawing Index

1.7.4 Bill of Materials

1.7.5 Interconnecting Diagrams

1.7.6 Conduit and Cable Schedule

1.7.7 Conduit Routing Drawings

1.7.8 Mounting Details

1.7.9 15kV Tubular Bus System Drawings

1.7.10 15kV Reactor

1.7.11 As-Built Drawings

1.7.12 Submission of Product Data

1.7.13 Submission of Design Data

1.7.14 Submission of Factory Test Results

PART 2 PRODUCTS

2.1 MATERIALS AND EQUIPMENT

2.1.1 Compliance with Standards

2.1.2 Standard Products

2.2 CONDUIT, RACEWAYS, DUCTS, FITTINGS AND HANGERS

2.2.1 Rigid Metal Conduit

2.2.2 Liquid-Tight Flexible Metal Conduit

2.2.3 Non-Metallic Wiring Duct (Channel)

2.2.4 Rigid Metallic Conduit Fittings

2.2.5 Flexible Conduit Fittings

2.2.6 Conduit Hangers

2.2.7 Wire Ways

2.3 BOXES AND ENCLOSURES

2.3.1 Pull Boxes

2.3.2 Enclosures

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2.3.2.1 Outdoor Potential Transformer Enclosure

2.4 MOLDED CASE CIRCUIT BREAKERS

2.4.1 Trip Units

2.4.2 120/240VAC Circuit Breakers

2.4.3 125VDC Circuit Breakers

2.5 CONTROL EQUIPMENT

2.5.1 Terminal Blocks

2.5.1.1 Markings

2.5.1.2 Control Signal Type

2.5.1.3 Short-Circuiting Type

2.5.1.4 Power Terminal Blocks

2.5.2 Test Switches

2.5.2.1 General

2.5.2.2 Wiring

2.5.3 Control, Instrument, and Selector Switches

2.5.3.1 General

2.5.3.2 Control Switches

2.5.3.3 Instrument Switches

2.5.3.4 Selector Switches

2.5.4 INSTRUMENT TRANSFORMERS

2.5.4.1 General

2.5.4.2 Voltage Transformers

2.5.4.2.1 General

2.5.4.2.2 Switchgear Potential Transformers

2.5.4.2.3 Outdoor Potential Transformers

2.5.4.3 Current Transformers

2.5.4.3.1 General

2.5.4.3.2 Window or Bushing Type Current Transformers

2.5.4.3.3 Rating

2.5.4.3.4 CT Burden Analysis

2.5.5 Protective Relays

2.5.5.1 Breaker Protection Relays

2.5.5.2 Bus Differential Protection Relays

2.5.5.3 Lock-out Relays

2.5.6 Indicating Lamp Assemblies

2.6 ESCUTCHEONS AND NAMEPLATES

2.7 Watthour Meters

2.8 MEDIUM-VOLTAGE TUBULAR BUS SYSTEM

2.8.1 Seamless Aluminum Conductors

2.8.2 Vibration Dampening Cable

2.8.3 Tube Bends

2.8.4 Tube Tees

2.8.5 Corona End Caps

2.8.6 End Plugs

2.8.7 Bus Supports

2.8.8 Electrical Connectors

2.8.9 Flexible Conductors

2.9 15KV Tubular Bus Insulators

2.10 SHUNT REACTOR

2.11 GROUP-OPERATED DISCONNECT SWITCHES

2.12 CABLE BUS SYSTEMS

2.12.1 General

2.12.2 Above Grade Cable Bus

2.12.3 Below Grade Cable Bus

2.12.4 Transition Compartments and Connections

2.13 Cubicle Room Warning Lights

2.14 DRY-TYPE TRANSFORMERS

2.14.1 Rating

2.14.2 Construction

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2.15 PHASE IDENTIFICATION SIGNS

2.16 TRAPPED KEY INTERLOCK

2.17 CUBICLE ROOM LIGHTING EVALUATION

2.18 SPARE PARTS

PART 3 EXECUTION

3.1 DEMOLITION, INSTALLATION, AND RECONFIGURATION

3.1.1 EQUIPMENT REPLACEMENT AND CUTOVER PLAN

3.1.1.1 General

3.1.1.2 Required Provisions

3.1.2 Work Sequencing

3.1.2.1 Demolition Work Sequence

3.1.2.2 Installation

3.2 CONTRACTOR ELECTRICAL DESIGN REQUIREMENTS

3.3 ELECTRICAL CLEARANCES

3.4 SEISMIC REQUIREMENTS

3.5 EXISTING MEDIUM-VOLTAGE CABLE TESTING

3.5.1 Pre-work Testing of Existing Medium-Voltage Cables

3.5.2 Post-work Testing of Existing Medium-Voltage Cables

3.6 CONDUIT SYSTEM INSTALLATION

3.6.1 General

3.6.2 Thread Compound

3.6.3 Liquid-Tight Flexible Conduit

3.6.4 Cutting and Threading

3.6.5 Bends

3.6.6 Expansion Fittings

3.6.7 Coordination

3.6.8 Termination of Conduit

3.6.9 Grounding and Bonding of Conduit

3.6.10 Conduit Cleaning

3.6.11 Conduit Labeling

3.6.12 Conduit Inspection

3.7 BOX AND ENCLOSURE INSTALLATION

3.7.1 General

3.7.2 Installation

3.8 ESCUTCHEONS AND NAME PLATE INSTALLATION

3.9 PAINTING

3.9.1 New Equipment

3.9.2 Existing Equipment

3.10 MEDIUM-VOLTAGE TUBULAR BUS SYSTEM

3.10.1 Tubular Bus Support Structure

3.10.1.1 Instrument Transformers

3.10.1.2 Insulator Supports

3.10.2 Bus Ends

3.10.3 Vibration Dampening

3.10.4 TUBULAR BUS WELDING

3.10.4.1 Cleaning and Preparation for Welding

3.10.4.2 Welding

3.10.4.3 Inspection

3.11 SHUNT REACTOR INSTALLATION

3.12 INSPECTION AND TESTING

-- End of Section Table of Contents --

SECTION 26 05 00.00 26 Page 3

SECTION 26 05 00.00 26

BASIC ELECTRICAL MATERIALS AND METHODS

PART 1 GENERAL

1.1 DESCRIPTION OF WORK

This section applies to all equipment furnished or installed as part of this Contract. The equipment includes, but is not limited to, furnishing and installing new 15 kV switchgear system to include feeders to the loads, 15kV reactors, control wiring, cable tray system and the related equipment necessary for operation of the major components at Fort Peck Dam. Installed equipment under this contract shall be in accordance with NFPA 70 and IEEE C2. Omission of details on the drawings or in the specifications are not to be construed as permitting deviations from Code requirements.

An outage to remove existing equipment cannot be requested until all material, including the new switchgear and vacuum circuit breakers has arrived on site.

1.2 REFERENCES

AMERICAN WELDING SOCIETY (AWS)

AWS D1.2/D1.2M (2014; Errata 1 2014; Errata 2 2020) Structural Welding Code - Aluminum

ASTM INTERNATIONAL (ASTM)

ASTM A1011/A1011M (2018a) Standard Specification for Steel, Sheet, and Strip, Hot-Rolled, Carbon, Structural, High-Strength Low-Alloy and High-Strength Low-Alloy with Improved Formability and Ultra-High Strength

ASTM B241/B241M (2022) Standard Specification for Aluminum and Aluminum-Alloy Seamless Pipe and Seamless Extruded Tube

ASTM D709 (2017) Laminated Thermosetting Materials

INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS (IEEE)

IEEE 1427 (2020)IEEE Guide for Recommended Electrical Clearances and Insulation Levels in Air Insulated Electrical Power Substations

IEEE C2 (2023) National Electrical Safety Code

IEEE C12.1 (2007) Standard for SCADA and Automatic Systems

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IEEE C37.20.2 (2015) Metal-Clad Switchgear

IEEE C37.30.1 (2011)Standard Requirements for AC High-Voltage Air Switches Rated Above 1000 V

IEEE C37.90 (2005; R 2011) Standard for Relays and Relay Systems Associated with Electric Power Apparatus

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

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IEEE C57.21 (2021) Standard Requirements, Terminology, and Test Code for Shunt Reactors Rated Over 500kVA

IEEE C57.32 (2015) Standard Requirements, Terminology, and Test procedures for Neutral Grounding Devices

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NATIONAL ELECTRICAL CONTRACTORS ASSOCIATION (NECA)

NECA 101 (2013) Standard for Installing Steel Conduits (Rigid, IMC, EMT)

NECA/NEIS 1 (2015) Good Workmanship in Electrical Construction

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)

ANSI C80.1 (2020) American National Standard for Electrical Rigid Steel Conduit (ERSC)

NEMA 250 (2020) Enclosures for Electrical Equipment (1000 Volts Maximum)

NEMA FB 1 (2014) Standard for Fittings, Cast Metal Boxes, and Conduit Bodies for Conduit, Electrical Metallic Tubing, and Cable

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 70 (2023) National Electrical Code

UNDERWRITERS LABORATORIES (UL)

UL 248-8 (2011; Reprint Aug 2020) Low-Voltage Fuses

- Part 8: Class J Fuses

UL 489 (2016; Rev 2019) Molded-Case Circuit Breakers, Molded-Case Switches and Circuit-Breaker Enclosures

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UL 50 (2015) Enclosures for Electrical Equipment, Non-environmental Considerations

UL 514A (2013) Metallic Outlet Boxes

UL 514B (2012; Reprint May 2020) Conduit, Tubing and Cable Fittings

UL 6 (2007; Reprint Sep 2019) Electrical Rigid Metal Conduit-Steel

UL 870 (2016) Wireways, Auxiliary Gutters, and Associated Fittings

UL 94 (2013; Reprint Apr 2022) Standard for Tests for Flammability of Plastic Materials for Parts in Devices and Appliances

UL 360 (2013; Reprint Aug 2021) Liquid-Tight Flexible Steel Conduit

UL 1565 (2013) Standard for Safety Positioning Devices

1.3 SUBMITTALS

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

submittals having an "I" designation are for information only. A designation following the "G" or "I" designation identifies the office that will review the submittal for the Government. The following must be submitted in accordance with SECTION 01 33 00 SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

Equipment Replacement And Cutover Plan; G, HDC

Tubular Bus Welding Procedure; G, HDC

Welder Qualification; G, HDC

SD-02 Shop Drawings

Submit within 120 days after Notice To Proceed:

In accordance with paragraph "QUALITY ASSURANCE."

Drawing Index; G, HDC

Bill of Materials; G, HDC

Cable Bus Systems; G, HDC

15kV Reactor; G, HDC

Conduit Routing Drawings; G, HDC

Conduit and Cable Schedule; G, HDC

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Insulator Mounting Drawings; G, HDC

Medium-Voltage Tubular Bus System; G, HDC

Cubicle Room Warning Lights Installation; G, HDC

Dry-Type Transformers; G, HDC

As-Built Drawings; G, HDC

SD-03 Product Data Within 90 calendar days after Notice to Proceed, submit complete descriptive literature and specifications of each product or system of products listed with original, legible manufacturer's cut sheets and data sheets to clearly indicate physical construction, operation, electrical characteristics, ratings, and associated hardware, as applicable. Include manufacturer's catalog numbers and designations, and clearly cross-reference with shop drawings as appropriate. Product data submitted for approval must clearly show conformance with these specifications, including, but not being limited to, product manufacturers' declarations of conformance to applicable technical standards. Product data must be approved prior to procurement of associated materials and equipment.

Rigid Metal Conduit; G, HDC

Liquid-Tight Flexible Metal Conduit; G, HDC

Rigid Metallic Conduit; G, HDC

Fittings; G, HDC

Non-Metallic Wiring Duct (Channel); G, HDC

Flexible Conduit Fittings; G, HDC

Conduit Hangers; G, HDC

Wire Ways; G, HDC

Control, Instrument, and Selector Switches; G, HDC

Pull Boxes; G, HDC

Enclosures; G, HDC

Molded Case Circuit Breakers; G, HDC

Terminal Blocks; G, HDC

Control Relays; G, HDC

Test Switches; G, HDC

Indicating Lamp Assemblies; G, HDC

Escutcheons and Nameplates; G, HDC

Indicating Instruments; G, HDC

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15kV Insulators; G, HDC

15kV Tubular Bus Conductors; G, HDC

Group-Operated Disconnect Switches; G, HDC

Cable Bus Systems; G, HDC

Protective Relays; G, HDC

Shunt Reactor; G, HDC

Cubicle Room Warning Lights; G, HDC

Phase Identification Signs; G, HDC

Trapped Key Interlocks; G, HDC

SD-05 Design Data

15kV Tubular Bus System; G, HDC

Cable Bus Systems; G, HDC

Characteristic Curves for Instrument Transformers; G, HDC

SD-06 Test Reports

Existing MV Cable Pre-Work Inspection and Test Report; G, HDC

Cubicle Room Lighting Evaluation; G, HDC

SD-07 Certificates

Registered Electrical Professional Engineer

CT Burden Analysis; G, HDC

SD-08 Manufacturer's Instructions

Spare Parts; G, HDC

1.4 DESIGNER QUALIFICATIONS

All drawings submitted as part of this contract must be stamped and signed by an electrical engineer that is a registered professional engineer who has done the design himself/herself or supervised and reviewed work, if done by other engineers. The registered professional engineer must demonstrate a minimum three years of relevant experience in designing this type of work. Provide a resume demonstrating the minimum years of experience; including name of firm(s) the engineer was employed by, name of project(s) they worked on, contract number, project location, date of design or construction completion, contract or project point of contact with contact information (address, phone number, e-mail), and describe relevant experience.

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1.5 GENERAL REQUIREMENTS

1.5.1 Materials, Equipment and Installation

New materials and equipment must be furnished and any defective material or equipment damaged in the course of installation must be replaced or repaired. Testing must be performed to check the installation of and the proper operational functions of the electrical equipment. The installations must be in accordance with the National Electrical Code, NFPA 70 , and the National Electrical Safety Code, IEEE C2 , except where otherwise specifically shown or specified, in which case the drawings and specifications must govern. Omission of details on the drawings or in the specifications must not be construed as permitting deviations from Code requirements.

1.5.2 Standard Products

Material and equipment must be the standard products of manufacturers regularly engaged in the manufacture of these products and must essentially duplicate items that have been in satisfactory use for at least 5 years prior to proposal due date.

1.5.3 Corrosion Prevention

1.5.3.1 General

All equipment must 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. Materials used for corrosion prevention must be submitted for approval under SD-03 Product Data.

1.5.3.2 Fastenings and Fittings

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

1.5.3.2.1 Corrosion-Resisting Materials

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

1.6 DELIVERY, STORAGE, AND HANDLING

Ship the equipment and/or materials as completely assembled and wired as feasible so as to require a minimum of installation work. Each shipping section is properly match marked to facilitate reassembly. Provide equipment with removable lifting channels with eye bolts for attachment of crane slings to facilitate lifting and handling. Carefully pack and ship separately any relay or other device which cannot withstand the hazards of shipment when mounted in place on the equipment. Mark these devices with the number of the panel which they are to be mounted on and fully identified. Wrap all finished painted surfaces and metal work to protect from damage during shipment. Prepare all parts for shipment so that slings for handling may be attached readily while the parts are in a railway car or transport truck. Ensure sections of equipment crated for

SECTION 26 05 00.00 26 Page 9 shipment will pass though any limiting doors, passageways, or hatches including those that will be encountered when moving the equipment to the installation location. The freight elevator (12000 lb) located in Powerhouse 1 is available for use by the Contractor. The elevator interior dimensions are 7'6" Width, 9' Depth, 8'2" Height. Carefully package and clearly mark all spare parts and accessories.

1.7 CONTRACT DRAWINGS

1.7.1 General

a. The contract drawings indicate the work to be accomplished in as much detail as is practical. Except for such modifications as may be required for coordination with equipment actually furnished, they constitute the working drawings for construction and for purchase of required materials. The contract drawings must be superseded by manufacturer's shop drawings when available

b. Field verify all existing dimensions, details, and features relevant to requirements for equipment, apparatus, and other coordinating features required for the design, manufacture, and installation of the new equipment and accessories.

1.7.2 Departure From Drawings

If departures from the contract drawings are necessary, details of such departures and reasons for them must be submitted not later than 90 days before scheduled installation date. No such departures will be made without prior written approval. The control schemes shown on the contract drawings are not intended to exclude the Contractor's method for accomplishing the functions indicated. However, if any alternate equipment is approved, the Contractor must bear the cost and be responsible for furnishing and installing any additional wiring devices that are required.

1.7.3 Drawing Index

Submit shop drawings to provide complete installation details with a comprehensive index of shop drawings. The index must be part of the accompanying drawing set, having a title block, border, and sheet number compatible with the drawing set.

1.7.4 Bill of Materials

Submit a comprehensive bill of materials (schedule of equipment) for installation shop drawing set. Schedule must be part of the drawing set, having a title block, border, and sheet number compatible with the drawing set. Schedule will provide a cross reference between manufacturer data and shop drawings, regardless of whether the product data is submitted at the same time as the shop drawing set. Schedule will include the total quantity, manufacturer, part number, and location of each item of equipment supplied.

1.7.5 Interconnecting Diagrams

Submit drawings showing interconnections between devices internal to panels and equipment enclosures, and between equipment assemblies and external interfaces. Terminal board connections, wire designations, and size and type of wire must be indicated on wiring diagrams.

SECTION 26 05 00.00 26 Page 10

1.7.6 Conduit and Cable Schedule

A cable and conduit schedule has been provided, which is based on the known requirements to remove the existing equipment and for the new equipment with estimated lengths to be used for bidding purposes.

Additional cables may be required due to the Contractor's equipment selection. Submit a comprehensive schedule of cable and conduit. Schedule shall appropriately cross reference with schematic drawings. Schedule shall have a title block and border.

1.7.7 Conduit Routing Drawings

Submit drawings showing the routing of the new conduit and where it interfaces with existing conduit. For underground electrical conduit include routing, arrangement and layout and where they interface with existing underground structures and new equipment pads.

1.7.8 Mounting Details

Submit insulator mounting drawings, including location, dimensions, and complete mounting details.

1.7.9 15kV Tubular Bus System Drawings

Submit drawings of the installation of the new 15kV tubular bus, including layout and outline configuration in the switchyard, clearances, support, connection details, and mounting details.

1.7.10 15kV Reactor

Submit drawings showing the dimensions and mounting details.

1.7.11 As-Built Drawings

Submit as-built drawings and data for the base and optional items of work in accordance with SECTION 01 78 00.00 24, AS-BUILT DRAWINGS .

1.7.12 Submission of Product Data

Submit complete descriptive literature and specifications of each product or system of products listed in the submittal article with original, legible manufacturer's cut sheets and data sheets to clearly indicate physical construction, operation, electrical characteristics, ratings, and associated hardware, as applicable. Include manufacturer's catalog numbers and designations, and clearly cross-reference with shop drawings as appropriate. Product data submitted for approval must clearly show conformance with these specifications, including, but not being limited to, product manufacturers' declarations of conformance to applicable technical standards. Product data must be approved prior to procurement of associated materials and equipment.

1.7.13 Submission of Design Data

Submit design calculations for approval in conjunction with or prior to the submission of corresponding product data and shop drawings per SECTION 13 48 00.00 26. 15kV Tubular Bus Support Calculations must include worst-case loading of the tubular bus. Design data must be approved prior to procurement of associated materials and equipment. Calculations must be

SECTION 26 05 00.00 26 Page 11 provided for new and existing (if reused) bus structures.

1.7.14 Submission of Factory Test Results

Document and submit results of tests performed in the manufacturers' factory to the Government within 7 working days after completion of the test.

PART 2 PRODUCTS

2.1 MATERIALS AND EQUIPMENT

2.1.1 Compliance with Standards

Equipment must be new and meet all applicable NEMA and UL construction and rating requirements. No equivalent will be acceptable. Immediately notify the Contracting Officer of any requirements of the specifications or Contractor proposed materials or assemblies that do not comply with UL or NEMA. International Electrotechnical Commission (IEC) rated equipment will not be considered an acceptable alternative to specified NEMA ratings.

2.1.2 Standard Products

Provide materials and equipment that are products of manufacturers regularly engaged in the production of such products which are of equal material, design and workmanship, and have been in satisfactory industrial use for 5 years prior to bid opening including applications of equipment and materials under similar circumstances and of similar size.

2.2 CONDUIT, RACEWAYS, DUCTS, FITTINGS AND HANGERS

2.2.1 Rigid Metal Conduit

Rigid metal conduit, including couplings, must conform to UL 6 and/or ANSI C80.1 and must be zinc-coated both inside and outside by hot-dip galvanizing method.

2.2.2 Liquid-Tight Flexible Metal Conduit

Liquid-tight flexible metal conduit must be made from steel strip that is zinc-coated by the hot-dip galvanizing method with an integral or separate bonding wire or and water-proof extruded PVC cover and conforming to UL 360 .

2.2.3 Non-Metallic Wiring Duct (Channel)

Non-metallic wiring duct (channel)must be two piece construction, halogen free with a a flame class of V-0 as specified in UL 94 and have a UL recognized for continuous use temperature of 95 degrees Celsius conforming to UL 1565 . Ducts are to have an open slotted base with solid snap-on cover.

2.2.4 Rigid Metallic Conduit Fittings

Threaded fittings for rigid conduit are to be made of solid zinc or malleable iron and listed to UL 514B and/or NEMA FB 1 . Threadless fittings can not be used. Malleable iron fittings must be zinc-coated both inside and outside by hot-dip galvanizing method. Hubs must have a grounding screw on the locknut. Expansion fittings must have a maximum of

SECTION 26 05 00.00 26 Page 12

4 inches of travel and have external flexible copper braid bonding jumper.

2.2.5 Flexible Conduit Fittings

Flexible conduit fittings must be made from steel or malleable iron with a zinc coating for flexible metal conduit with positive bonding, and conforming to UL 514B .

2.2.6 Conduit Hangers

Fabricate conduit hangers from two or more galvanized steel hanger rods, a galvanized steel horizontal member, clamps, and other attachments as necessary for securing hanger rods and conduits. Hanger rods must not be smaller than 3/8-inch diameter and threaded either full length or for a sufficient distance at each end to permit at least 1-1/2 inches of adjustment. The horizontal member must be manufactured from hot rolled carbon steel with a galvanized finish conforming to ASTM A1011/A1011M .

Hangers must be designed for hanging conduit. Conduit strut brackets must be made from a minimum of 12 gauge, hot rolled carbon steel with a galvanized finish conforming to ASTM A1011/A1011M .

2.2.7 Wire Ways

Metallic wire ways are to be galvanized with knockouts. Wire ways must have hinge/screw covers conforming to UL 870 .

2.3 BOXES AND ENCLOSURES

2.3.1 Pull Boxes

Provide pull boxes made of malleable iron conforming to UL 514A with threaded fittings and must be zinc-coated both inside and outside by hot-dip galvanizing method.

2.3.2 Enclosures

Provide steel NEMA Type 4X enclosures that conform to UL 50 and NEMA 250, made from a minimum of 12 Standard Gage thickness and painted Munsell color system 5BG 7/0.4 high gloss (ANSI No. 70 gray), with provisions for locking. Piano type hinges are not acceptable for enclosure doors.

2.3.2.1 Outdoor Potential Transformer Enclosure

Provide enclosures for the outdoor potential transformer fuses that is a minimum of 8 inch by 10 inch by 4 inch enclosure with JIC clamps to secure the door and have provisions for locking the enclosure with a padlock.

Provide an enclosure with a window in the door for verification of the status of the fuses without opening the enclosure door.

2.4 MOLDED CASE CIRCUIT BREAKERS

Provide molded case circuit breakers that conform to the applicable requirements of UL 489 . The circuit breakers must be manually-operated, be quick-make, quick-break, common trip type, and be of automatic-trip type unless otherwise specified or indicated on the drawings. All poles of each breaker are required to operate simultaneously by means of a common handle. The operating handles must clearly indicate whether the breakers are in "On," "Off," or "Tripped" position and have provisions for

SECTION 26 05 00.00 26 Page 13 padlocking in the "Off" position. Provide personnel safety line terminal shields for each breaker. The circuit breakers are to be products of only one manufacturer, and be interchangeable when of the same frame size.

2.4.1 Trip Units

Except as otherwise noted, provide circuit breakers, of frame sizes and the trip unit ratings as shown on the drawings, with combination thermal and instantaneous magnetic or solid state trip units. The Government reserves the right to change the indicated trip ratings, within frame limits, of the trip devices at the time the shop drawings are submitted for approval. Submit outline drawings of all equipment to be furnished under this contract, together with weights and overall dimensions for approval. The breaker trip units must be interchangeable, and the instantaneous magnetic trip units be adjustable on frame sizes larger than 150 amperes, and be set at approximately 10 times the continuous current ratings of the circuit breakers. Solid state trip units, where indicated, must also have adjustable long time pick-up and delay,short time pick-up and delay, and ground fault pick-up and delay.

2.4.2 120/240VAC Circuit Breakers

Provide circuit breakers for 120VAC circuits rated not less than 120/240 or VAC, and have a UL listed minimum interrupting capacity of 14,000 symmetrical amperes at 600 VAC.

2.4.3 125VDC Circuit Breakers

Provide two-pole circuit breakers for 125VDC circuits, rated 125/250VDC or 125VDC, and have UL listed minimum interrupting capacity of 14,000 symmetrical amperes at 250VDC.

2.5 CONTROL EQUIPMENT

2.5.1 Terminal Blocks

2.5.1.1 Markings

Each connected terminal must have the circuit designation or wire number marked on or near the terminal in permanent contrasting color. White or other light-colored plastic marking strips, fastened by screws to each terminal block, must be provided for control wire designations. The manufacturer's wire number and the Government's wire number must both be shown for each connected terminal on the marking strips with permanent marking fluid. The marking strips must be reversible to permit marking both sides, or two marking strips must be furnished with each block, to accommodate the two sets of wire numbers.

2.5.1.2 Control Signal Type

Provide control signal type terminal blocks of double row terminal type rated for 600 volts and 30 amps. Terminals must be plated brass with #8-32 phil-slot screws that can accept lugs with a maximum width of 0.42-inches.

2.5.1.3 Short-Circuiting Type

Provide short-circuiting type terminal blocks for all current transformer secondary leads with provisions for shorting together all leads from each

SECTION 26 05 00.00 26 Page 14 current transformer without opening any circuit. Short-circuiting the terminals of only one current transformer must not short-circuit the terminals of any other current transformer.

2.5.1.4 Power Terminal Blocks

Provide power distribution blocks for branch circuits and feeders 600 volts and less, with a minimum rating of 30 amps and accommodate wire size #12 AWG and larger. Power distribution blocks must be double row type and have lugs suitable for copper conductors, must be two-pole for single-phase circuits (phase and neutral conductors, or two phase conductors), and three-pole for three-phase circuits (three phase conductors). Three-phase four-wire circuits, where used, must have a three-pole block for the phase conductors and a single-pole block for the neutral, which must be mounted next to the block for the phase conductors.

For conductors rated more than 50 amperes, screws must have hexagonal heads. Conducting parts between connected terminals must have adequate contact surface and cross-section to operate without overheating.

2.5.2 Test Switches

2.5.2.1 General

Provide test switches as shown for all voltage, current, power and trip signals into the protective relay. Provide switches rated not less than 30 amperes and 600 volts AC and DC. Provide one deep clear cover for each test block with lockable features for lockout-tagout. Provide one pair of short-circuiting type poles for each current circuit, and one potential pole for each other circuit. Provide black handles for each current circuit. Provide red handles for each potential circuit. Provide one separate source test plugs for insertion into the associated test switches for testing and calibration. Provide test switches equivalent Provide test switches equivalent to States FMS19 test switches.

2.5.2.2 Wiring

Install test switches horizontally and arrange wiring as follows as read left to right from the front of the test switch (front of panel). Arrange voltage and current wiring in A-B-C-N sequence, to match existing sequence (e.g., current then voltage)used in powerhouse. Where possible, group voltage and current inputs together on the same test switch blocks.

Arrange discrete inputs/outputs starting with lowest number input first, then rising numbers, followed by outputs, starting with the lowest output.

Control power for the device is connected to the first two test switches (top left when looking at the front) of the test block associated with the device.

2.5.3 Control, Instrument, and Selector Switches

2.5.3.1 General

Provide control, instrument, and selector switches with rotary switchboard type with handles on the front and operating contact mechanisms on the rear of the panels, rated for alternating-current operation at 600 V, or direct-current operation at 250 V, as applicable, in accordance with the switch development specified in the contract drawings. All switches and contacts must be capable of satisfactorily withstanding a life test of at least 10,000 operations with rated current flowing in the switch contacts, and must be capable of continuously carrying 20 A without exceeding a

SECTION 26 05 00.00 26 Page 15 temperature rise of more than 30 degrees C above ambient. Each switch provided must have ample contact stages including spare contacts to perform the functions of the control system. Contacts of switches must be self-aligning and must operate with a wiping action. A positive means of maintaining high pressure on closed contacts must be provided.

Compression springs or pivoted joints must not be depended upon to carry current. The covers or plates on the switches must be readily removable for inspection of contacts. Each switch must be provided with an escutcheon clearly marked to show each operating position. Switch identifications and handle positions must be engraved on escutcheons or may be provided on separate nameplates. Switches must be provided with black oval handles unless otherwise specified on the contract drawings.

2.5.3.2 Control Switches

Control switches must be two or three-position momentary-contact type with spring return to neutral position with black pistol-grip handles or as required by the contract drawings.

2.5.3.3 Instrument Switches

Instrument switches must be the maintained-contact type with the required number of positions. Ammeter switches must not open the secondary circuits of current transformers at any time.

2.5.3.4 Selector Switches

Selector switches must be of the maintained-contact type, remaining in the last position until deliberately moved to another position unless shown otherwise on the contract drawings.

2.5.4 INSTRUMENT TRANSFORMERS

2.5.4.1 General

a. Ensure all instrument transformers conform to the applicable grounding requirements of IEEE C57.13 . Thermal rating of instrument transformers is to be 1.33.

b. Bring out all leads from each individual instrument transformer to switchgear terminal blocks. Ground all instrument transformer secondary circuits together at the switchgear terminal blocks. Ground all secondary leads together at the instrument transformer for shipping.

c. Provide Characteristic Curves for Instrument Transformers.

2.5.4.2 Voltage Transformers

2.5.4.2.1 General

Ensure Voltage (Potential) Transformers, except as otherwise specified, conform to the applicable requirements of IEEE C57.13. Main unit generator voltage transformers must have a minimum full-wave impulse level of 110 kV, 15kV switchgear voltage transformers must have a minimum full-wave impulse level of 95 kV, and the outdoor voltage transformers must have a minimum full-wave impulse level of 110 kV. Provide voltage transformers with a relay and metering accuracy of 0.3W, 0.3X, 0.3Y, 0.6Z. Configure voltage transformers as indicated on the Contract drawings. Ensure the

SECTION 26 05 00.00 26 Page 16 voltage rating is as indicated on the drawings, and the thermal rating for a 55 degrees C ambient is not less than 750 volt-amperes.

2.5.4.2.2 Switchgear Potential Transformers

The voltage transformers are to be of the indoor dry or compound-filled type. Mount each voltage transformer in separate switchgear compartments in a fused rollout tray with stabs that disconnects and grounds the voltage transformer when the tray is pulled out. If rails are required by the switchgear design, provide a mechanical interlock to prevent the drawer from being pulled out without the rails being installed. Provide the transformer with current limiting fuses for each phase connection on the primary side. Fuse the transformer secondary side in the switchgear low voltage compartment. Locate fuses so as to be readily accessible.

Fuses must be able to withstand maximum possible energizing current, but capable of interrupting the circuit in case of a short-circuit on the secondary winding. Connect each voltage transformer low voltage connection to a terminal block in the switchgear low voltage compartment.

2.5.4.2.3 Outdoor Potential Transformers

Provide two-winding type voltage transformers designed for outdoor applications with identifying nameplate visible after the installation is completed. Provide new potential transformer with primary fuses and secondary fuses that are Class J and rated for 5 amps that meet the requirements of UL 248-8 . Fuses must be rated for 600VAC operation, and be dual-element with a 10 second time-delay at 500 percent overload.

Provided fuseholders must be Class J, meeting the requirements of UL 4248-8 , and be of a finger-safe modular design consisting of a removable fuse carrier which allows fuse replacement away from the base.

2.5.4.3 Current Transformers

2.5.4.3.1 General

Ensure the quantity, ratios, and functions of the current transformers are as shown on the drawings, and except as otherwise specificed, conform to the applicable requirements of IEEE C37.20.2 , IEEE C57.13 , and IEEE C57.13.3 . Provide current transformers of the dry or compound-insulated type revenue grade. Provide a suitable means of mounting and for grounding the frame. Plainly mark the polarity of the current transformers. All current transformers must be suitable for continuous operation at the full-rated voltage and current at a frequency of 60 Hz. Design all current transformers to withstand, without damage, the thermal and mechanical stresses resulting from short-circuit currents corresponding to ratings of the breakers in the circuits to which they are connected. Current transformers must have a continuous thermal current rating factor based on 30 deg C average ambient air temperature of a minimum of 1.33. Do not provide current transformer secondary leads smaller than No. 10 AWG. Connect each current transformer secondary lead to a terminal block of the short-circuiting type in the low voltage compartment, located to permit short-circuiting the secondary windings without requiring access to the primary bus compartments. For each current transformer, short the terminals for shipping.

2.5.4.3.2 Window or Bushing Type Current Transformers

Install window or bushing type current transformers only, unless otherwise noted. Window or bushing type current transformers must have a minimum

SECTION 26 05 00.00 26 Page 17 full-wave insulation level of equipment voltage rating. When the current transformers are installed in the switchgear the installation must meet the requirements for a 60-kV BIL rating for 5kV and 95-kV BIL rating for 15kV as listed in Table 2 of IEEE C57.13 for test voltage applied between the bus and transformer secondary terminals.

2.5.4.3.3 Rating

Ensure that the current transformers meet the requirements of IEEE C57.13 .

Current transformers with ratio of 1000/5 through 4000/5 must have a combination metering / relaying minimum rating of 0.3 B-1.8/ C400, as shown in the drawings. All other current transformer ratios and ratings are to be calculated to provide accurate metering while ensuring no saturation in fault conditions.

2.5.4.3.4 CT Burden Analysis

Calculate the burden of the new relays, conductors and associated equipment to demonstrate that the burden does not exceed the current transformer rating. Notify the contracting officer if there is a problem with excessive burdens that could result in current transformers inaccuracies or going into saturation under fault conditions. Submit analysis as part of the Field Test Reports.

2.5.5 Protective Relays

2.5.5.1 Breaker Protection Relays

Provide microprocessor based SEL-751 type protective relays, part number 751001A3A1A7085B830, to perform the required functions as shown on the contract drawings. Connect synchronization checking functionality as shown on contract drawings. Connect the alarm functions into the existing annunciation system as shown on contract drawings. Power supply for the breaker protection relays must be 125 VDC with a range of 105 VDC to 140 VDC. Power consumption must be not more than 25 Watts. Mount the relays on the front panel of the breaker cabinets.

2.5.5.2 Bus Differential Protection Relays

Provide a SEL-487B Bus Differential protection relay, part number 0487B1X6X52XC1XEH7EEXXX, for 15kV bus 1 differential protection as shown in the contract drawings. Provide SEL-7873E 3 winding differential relays, part number 07873EE1A3ACA7685A8C0, for 15kV bus 2 and 3 differential protection as shown in the contract drawings. Mount the relays in a rack mount configuration in the Auxiliary Relay Board as shown on the contract drawings.

2.5.5.3 Lock-out Relays

Provide lock-out relays that conform to IEEE C37.90 with the following salient physical, functional, or performance characteristics:

a. Have a minimum of 12 normally open and 12 normally closed contacts or as shown on the contract drawings whichever is greater.

b. Have contacts that are capable of carrying 30 A continuously and break 5 A at 125 V dc

c. Have a nominal trip speed of less than 8 ms

SECTION 26 05 00.00 26 Page 18

d. Are rated to operate on 125 V dc and have a voltage operating range of 90 V dc to 140 V dc.

e. Have a lighted LED target nameplate

2.5.6 Indicating Lamp Assemblies

Provide LED switchboard type indicating lamp assemblies, rated for 125V dc and 120V ac service, with appropriate colored caps. The lamp assemblies must be a minimum of 1-inch diameter and the LED must be long-life LED type with a minimum normal life span of 50,000 hours. Color caps must be made of material, which will not be softened by the heat from the lamps.

Indicating lights must be visible from at least 20 ft. away. Lamps must be replaceable from the front of the panels, and any special tools required for lamp replacement must be furnished. All color caps must be similar and interchangeable, and all lamps must be of the same type and rating.

2.6 ESCUTCHEONS AND NAMEPLATES

a. Provide 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.

2.7 Watthour Meters

Provide SEL-735 watthour meters, part number 0735VX10944GXXDXXX16101XX, that are semi-flush, back-connected, dustproof, direct-reading, switchboard type, digital, with RS-485 communications capability. Watthour meters must conform to IEEE C12.1 and be of the switchboard type having a 15-minute, cumulative form, demand register. Watthour meters must be accurately calibrated for use with the associated instrument transformers.

2.8 MEDIUM-VOLTAGE TUBULAR BUS SYSTEM

Provide a medium-voltage welded type bus system, including welded bends, welded tees, and welded corona endbells that conform to ASTM B241/B241M and suitable for outdoor 15kV substation use.

2.8.1 Seamless Aluminum Conductors

Provide bare seamless 6063-T6 Alloy aluminum, *Am-3 4-inch 6-inch **Am-3 tubular bus conductors that meet the requirements of ASTM B241/B241M and suitable for outdoor 15kV substation use.

SECTION 26 05 00.00 26 Page 19

2.8.2 Vibration Dampening Cable

Provide appropriately sized aluminum conductor steel reinforced for system dampening.

2.8.3 Tube Bends

Provide 90 degree aluminum weldment couplers made from 356-T6 alloy for connecting the tubular bus at 90 degree bends.

2.8.4 Tube Tees

Provide tube to tube aluminum weldment tees made from 356-T6 alloy for connecting taps to the tubular bus.

2.8.5 Corona End Caps

Provide corona end caps made from 356-T6 aluminum alloy.

2.8.6 End Plugs

Provide internal weldment end plugs made from aluminum 356-T6 alloy.

2.8.7 Bus Supports

Provide aluminum horizontal type weldment bus supports for supporting the tubular bus from the insulators as indicated on the contract drawings.

2.8.8 Electrical Connectors

Provide tin plated, bronze bolt-on tubular bus to flat four-hole NEMA terminals for all electrical connections from the tubular bus. These connections include, but not limited to the tubular bus to the 15kV circuit breaker bushing terminals, from the tubular bus to the disconnect switches and from the tubular bus to the cable bus.

2.8.9 Flexible Conductors

Provide flexible bare copper conductors or tin plated braided copper conductors rated for 3000 and 4000 amps to connect the equipment to the tubular bus conductors, as indicated on the contract drawings.

2.9 15KV Tubular Bus Insulators

Provide new outdoor rated, station post and pin type insulators conforming to the requirements of NEMA C29.8 with a BIL rating of 110kV. The insulators shall be made of porcelain and be gray in color. The porcelain must be manufactured by the wet process, be homogenous, free from laminations, cavities or other flaws affecting its mechanical strength or dielectric quality.

2.10 SHUNT REACTOR

Provide two dry-type, air core shunt reactors as shown on the contract drawings. The reactors must meet the requirements of *Am-3 IEEE C57.32 IEEE C57.21 **Am-3 and shall have the following ratings:

SECTION 26 05 00.00 26 Page 20

a. Service: Outdoor

b. Rated Voltage: 13.8kV

c. Frequency: 60Hz

d. Rated Current: 502 A

e. Thermal Short Circuit/ Duration: 3.63kA/10sec

f. BIL: 110kV

The shunt reactor's conductor material must be aluminum. The shunt reactors must be tested in accordance with paragraph 4.10 Routine, Design, and other Tests for Neutral Grounding Reactors of *Am-3 IEEE C57.32 IEEE C57.21 **Am-3 . Submit a Shunt Reactor Test report for approval.

2.11 GROUP-OPERATED DISCONNECT SWITCHES

Provide disconnect switches of the outdoor, structure mounted, manually operated (switch handle operated), three-pole, single-throw type, preassembled for the indicated configuration and mounting. Contacts must be high-pressure silver-to-silver type, designed to ensure continuous surface contact. Switches must be complete with necessary operating mechanisms, handles, and other items required for manual operation from the ground. Switch operating handles must be located approximately 3 feet 6 inches above final grade. Insulation of switch operating mechanisms must include both insulated interphase rod sections and insulated vertical shafts. Each handle must be provided with a padlock arranged to lock the switch in both the open and the closed position. The disconnect switch must be Pascor disconnect switch, comply with IEEE C37.30.1 and have the following ratings:

a. Service: Outdoor

b. Rated Voltage: 23kV

c. BIL Rating: 150kV

d. Continuous Current: 4000 A

e. Peak Withstand Current: 195 kA

f. Short Time Withstand Current: 75 kA rms (sym), 3 sec

g. Momentary Withstand Current: 120 kA rms (asym)

2.12 CABLE BUS SYSTEMS

2.12.1 General

Provide complete metal enclosed bus systems including all necessary fittings, tap boxes, enclosure connectors, entrance fittings, insulated conductors,electrical connectors, terminating kits, and other accessories as required. Bus systems must be suitable for outdoor use with conductor spacing and ventilation maintained throughout the system. All elements of the bus enclosure must be so designed to eliminate any sharp edges or projections that may injure personnel or conductor insulations. Cable bus

SECTION 26 05 00.00 26 Page 21 must meet the corrosion prevention requirements of paragraph GENERAL REQUIREMENTS, the medium-voltage cable requirements of SECTION 26 05 19.00 26, and the applicable materials and loading requirements of SECTION 26 05 36.00 26. Supports must be provided at intervals as recommended by the bus manufacturer for the Contractor's design, and must meet the requirements of SECTIONS 03 60 00.00 26, 05 50 03.00 26, and

13.48 00.00 26. Cable bus systems must be CSA/ANSI C22.2 No 273 certified.

2.12.2 Above Grade Cable Bus

Design, furnish and install 15kV cable bus systems similar to existing between the 15kV switchgear bus 1 in Cubicle Room and the 15kV aluminum bus system in the switchyard, rated 4000A, between 15kV outdoor vacuum breaker 1124 and transformer KZ2A, rated 2000A, and between 15kV outdoor vacuum breaker 924 and transformer KY4A, rated 4000A. Existing cable bus was manufactured by MP Husky.

2.12.3 Below Grade Cable Bus

Design, furnish and install a 15kV, 4000A cable bus system to connect the 15kV outdoor vaccum breaker 724 to transformer KV7A. Install cable bus in a precast concrete trench provided with a venting system that enables free-air ampacity rating below grade. The precast encasement must be as designed by cable bus manufacturer, with power and offset vents positioned in accordance with manufacturer's technical requirements. The precast concrete trench must match the surrounding switchyard surfacing grade and be road grade trench rated for an HS20 axle load.

2.12.4 Transition Compartments and Connections

Design and provide transition compartments for the cable bus conductors.

Transition enclosures must be suitable for NEMA 4X service. Terminate the 15kV cable bus conductors with stress relief cones and must make connections to the transformer bushings with flexible copper braid conductor using NEMA standard bolt hole patterns. Flexible cooper braids must be stacked in parallel as required to provide connections equal in current-carrying capacity to the cable bus. Braided connections must be of sufficient length to provide seismic protection against accidental disconnection due to movement during geological activities as described in

SECTION 13 48 00.00 26.

2.13 Cubicle Room Warning Lights

Provide red strobing (flashing) lights at the three entrance points to the Cubicle Room, that indicate to those outside Cubicle Room that switching or other work is in progress. The warning lights must operate at 120VAC and must be activated by a switch located outside East Cubicle Room door. Exact locations of warning lights and switch must be coordinated in the field with project personnel. Submitt Cubicle Room Warning Lights Installation drawings that show locations of the warning lights and switch and cable and conduit sizes and routing.

2.14 DRY-TYPE TRANSFORMERS

2.14.1 Rating

Provide new dry-type transformers to replace existing transformers T7 and T8 in the switchyard. Transformer T7 must be a 75kVA, 3-phase, 60 Hz, SECTION 26 05 00.00 26 Page 22

480-240-volts, and transformer T8 must be 15kVA, 3-phase, 60 Hz, 240-208/120-volts conforming to the applicable requirements of NEMA ST 20.

Transformers must have 220 degrees C insulation system with a temperature rise not to exceed 115 degrees C under full-rated load in maximum ambient temperature of 40 degrees C. Transformer of 115 degrees C temperature rise must be capable of carrying continuously 115 percent of nameplate kVA without exceeding insulation rating. Transformers must conform to the applicable requirements of ANSI C57.12.50, IEEE C 57.12.91, and NEMA TR 1.

The impedance must be 5 percent subject to ANSI standard tolerance.

Transformers shall be NEMA ST 20, UL 506, general purpose, self-cooled, ventilated, with NEMA 3R weathershield kits for outdoor installation.

Transformers must be quiet type with maximum sound level at least 3 decibels less than NEMA standard level for transformer ratings indicated.

2.14.2 Construction

Provide transformers with continuously wound copper coils. The core, coils and metal enclosure of the transformer shall be rigidly attached to a base suitable for moving the complete transformer.