26RA003 - Amend-007 - Transformer Design Specs.pdf

LGA Lower Snake River Spare Transformers W912EF26RA003

LGA503118LSRSPTR

PROJECT TABLE OF CONTENTS

DIVISION 01 - GENERAL REQUIREMENTS

01 00 00.00 28 GENERAL REQUIREMENTS

01 11 01.00 28 SUPPLEMENTARY REQUIREMENTS

01 14 00.10 28 PROJECT SITE RESTRICTIONS

01 14 00.90 28 INTEGRATING ANTITERRORISM (AT) AND OPERATIONS SECURITY

(OPSEC)

01 32 16.00 28 SMALL PROJECT FABRICATION AND ASSEMBLY PROGRESS SCHEDULES

01 33 00 SUBMITTAL PROCEDURES

01 35 29.10 28 GOVERNMENTAL SAFETY REQUIREMENTS

01 42 00 SOURCES FOR REFERENCE PUBLICATIONS

01 45 00.01 28 CONTRACTOR QUALITY CONTROL (SHORT FORM)

01 45 01.00 28 RESIDENT MANAGEMENT SYSTEM CONTRACTOR MODE (RMS CM)

01 55 10.00 28 CONTRACTOR WORK, ACCESS AND STORAGE AREAS

01 57 20.00 28 ENVIRONMENTAL PROTECTION

01 78 00.00 28 CLOSEOUT SUBMITTALS

01 78 23.00 28 OPERATION AND MAINTENANCE DATA

DIVISION 26 - ELECTRICAL

26 05 19.00 26 INSULATED WIRE AND CABLE

DIVISION 48 - ELECTRICAL POWER GENERATION

48 19 23.04 26 CLASS II GSU POWER TRANSFORMER (T2)

48 19 23.08 26 CLASS II GSU POWER TRANSFORMER (T1)

48 20 00.04 26 TRANSFORMER SHIPMENT, HAULING AND SITE ASSEMBLY

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Amend-007

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Amend-007

Amendment-007

SECTION TABLE OF CONTENTS

DIVISION 48 - ELECTRICAL POWER GENERATION

SECTION 48 19 23.04 26

CLASS II GSU POWER TRANSFORMER (T2)

PART 1 GENERAL

1.1 DESCRIPTION OF WORK

1.2 GENERAL INFORMATION

1.2.1 Transformer Location

1.2.2 Ratings

1.3 REFERENCES

1.4 SUBMITTALS

1.5 TRANSFORMER WARRANTY REQUIREMENTS

1.5.1 General Warranty Requirements

1.5.2 Devices Exempt from the Transformer Full Warranty Period

PART 2 PRODUCTS

2.1 TYPE AND RATING

2.1.1 General

2.1.2 Transformer Limiting Dimensions and Equipment Arrangement

2.1.3 Requirements

2.1.4 Standard Products

2.1.5 Descriptive Data

2.1.6 Ratings and Electrical Characteristics

2.1.7 Transformer Type

2.1.8 Unusual Service Conditions

2.1.8.1 Magnetic Fields

2.1.8.2 Backfeed Mode

2.1.9 Impedance Tolerance

2.2 STRUCTURAL DESIGN CRITERIA AND SEISMIC CALCULATIONS

2.2.1 Structural Design Criteria

2.2.2 Transformer Mounting

2.3 THERMAL DESIGN

2.4 CORE

2.5 WINDINGS

2.6 TANK

2.6.1 FABRICATION

2.6.2 Lifting, Moving and Jacking Facilities

2.6.2.1 Lifting Facilities

2.6.2.2 Moving Facilities

2.6.2.3 Jacking Facilities

2.6.3 Gasketing

2.6.3.1 General

2.6.3.1.1 Low-voltage Bushings

2.6.3.2 Sizing

2.6.4 Valves

2.6.5 Connections

2.6.5.1 General

2.6.5.2 Stainless Steel

2.6.6 Steel Pipe and Fittings

2.6.7 Grounding

2.6.8 Portable Fall Arrest System

2.6.8.1 Portable Fall Arrest System Anchor Post

SECTION 48 19 23.04 26 Page 1

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Amendment-007 - Section 48 19 23.04 26 - Paragraph 2.1.6 "Ratings and Electrical Characteristics".

2.6.8.2 Anchor Post Accessories

2.6.8.3 Mounting Plates

2.6.9 Transformer Steel Base

2.7 COOLING EQUIPMENT

2.7.1 Radiators

2.7.2 Cooling Fans

2.7.3 Power Supply Equipment

2.7.4 Cooling Control Equipment

2.8 BUSHINGS

2.8.1 General Bushing Requirements

2.8.2 High-Voltage and High-Voltage Neutral Bushings

2.8.2.1 High-Voltage Bushing Ratings

2.8.2.2 High-Voltage Neutral Bushing Ratings

2.8.3 Low-Voltage Bushings

2.8.4 High-Voltage and Neutral Bushing Terminals and Connections

2.8.5 Core Ground Bushings

2.8.6 SFRA Test Shipping Bushings

2.8.7 Shipment and Storage

2.8.7.1 Shipment

2.9 BUSHING-TYPE CURRENT TRANSFORMERS

2.9.1 High-Voltage Bushing Current Transformers

2.9.2 Low-Voltage Bushing Transformers

2.10 LOW-VOLTAGE BUSHING THROAT ENCLOSURE

2.11 TRANSFORMER MOUNTED ACCESSORIES

2.11.1 General

2.11.2 Liquid Level Indicator

2.11.3 Thermowells

2.11.4 Analog Temperature Indicating Equipment

2.11.4.1 Liquid Temperature Indicator

2.11.4.2 Winding Temperature Equipment

2.11.5 Rapid Pressure Rise Relay

2.11.6 Rapid Pressure Rise Seal-In Relay

2.11.7 Pressure Relief Device

2.11.7.1 General

2.11.7.2 Oil Discharge Piping

2.11.8 Gas and Oil Actuated Relay (Buchholz)

2.11.9 De-Energized Tap Changer Control

2.11.10 Contacts and Devices

2.12 INSULATING OIL

2.12.1 Quantity and Transformer Oil Certification

2.12.2 Type of Oil

2.12.3 Chemical, Physical and Electrical Characteristics

2.12.4 Sampling

2.12.5 Testing

2.13 OIL PRESERVATION SYSTEM

2.13.1 General

2.13.2 Inert-Gas Pressure System

2.13.2.1 General

2.13.2.2 Additional Gas Space

2.13.2.3 Pressure Regulating Equipment

2.13.2.4 Alarm functions

2.13.2.5 Enclosure

2.13.3 Air Cell, Constant-Pressure, Reservoir Tank System

2.13.3.1 General

2.13.3.2 Air Bladder

2.13.3.3 Dehydrating Breather

2.14 TRANSFORMER CONTROL AND POWER CABINETS

2.14.1 General

2.14.2 Cabinet Mounting and Conduit Interface Provisions

SECTION 48 19 23.04 26 Page 2

2.14.3 Control Cabinet Requirements

2.14.4 Power Cabinet Requirements

2.14.5 Device Nameplates

2.15 CONTROL AND POWER CABINET EQUIPMENT

2.15.1 Cooling Control Equipment

2.15.1.1 General

2.15.1.2 Stages of Cooling

2.15.2 Transformer Fiber Optic Probes and Connectors

2.15.3 Auxiliary Power Transformer

2.15.4 Magnetic Contactors

2.15.5 Molded-Case Circuit Breakers

2.15.5.1 General

2.15.5.2 Trip Units

2.15.5.3 480 V ac Circuits

2.15.5.4 120 V ac Circuits

2.15.5.5 125 V dc Circuits

2.15.6 Control and Instrument Switches

2.15.7 Terminal Blocks

2.15.7.1 Control Signal Type

2.15.7.2 Short-Circuiting Type

2.15.7.3 Power Distribution Blocks

2.15.8 Fuses and Fuseholders

2.15.9 Lighting, Convenience Receptacle, and Cabinet Heaters

2.16 INSULATED WIRE AND CABLE

2.17 CONDUIT SYSTEMS

2.17.1 General

2.17.2 Corrosion Protection

2.17.3 Conduit and Fittings

2.17.4 Conduit Bodies

2.17.5 Conduit Outlet Boxes

2.18 SPARE PARTS

2.19 NAMEPLATES

2.19.1 Transformer Nameplate

2.19.2 Lifting Nameplate

2.19.3 Device Nameplates

2.19.4 Additional Transformer Identification

PART 3 EXECUTION

3.1 TRANSFORMER DESIGN DATA REVIEW MEETING

3.1.1 General

3.1.2 Design Data Review Meeting Requirements

3.2 TRANSFORMER DRAWINGS

3.2.1 Outline and Assembly Drawings

3.2.2 Detail Drawings

3.3 TRANSFORMER FACTORY ASSEMBLY

3.3.1 General

3.3.2 Welding

3.3.2.1 General

3.3.2.2 Welding Quality Control Plan

3.3.2.3 Welder Qualifications

3.3.2.4 Welding Materials

3.3.2.5 Welding Procedures

3.3.2.6 Preheat and Interpass Temperature

3.3.2.7 Weld Inspections, Tests and Weld Inspector Qualifications

3.3.3 Manufacturing Inspection by Government Personnel

3.4 FACTORY CLEANING AND PAINTING

3.4.1 General

3.4.2 Interior Surfaces

SECTION 48 19 23.04 26 Page 3

3.4.3 Exterior Surfaces

3.4.4 Machined Surfaces

3.5 TRANSFORMER FACTORY ACCEPTANCE TESTS

3.5.1 General

3.5.2 Factory Acceptance Test Report

3.5.3 Dissolved Gas-In-Oil Analysis

3.5.4 Temperature Rise Test

3.5.5 Core Insulation Resistance

3.5.6 Impulse Tests

3.5.7 Induced Voltage Test With Partial Discharge Measurements

3.5.7.1 General

3.5.7.2 7,200 Cycle Enhancement Level

3.5.7.3 One-Hour Level

3.5.7.4 Data Reporting

3.5.8 Audible Sound Level Test

3.5.9 Leak Test

3.5.10 Leakage Reactance Measurement Test

3.5.11 Sweep Frequency Response Analysis Tests

3.5.11.1 Required Tests

3.5.11.2 Test Equipment and Test Parameters

3.5.11.3 Test Cable Integrity

3.5.11.4 Test Connections

3.5.11.5 Data Reporting

3.5.11.6 Data Interpretation

3.5.12 De-Energized Tap Changer Test

3.5.13 Transformer Turns Ratio Test

3.5.14 Insulated Wire and Cable

3.6 BUSHING TESTS

3.6.1 General

3.6.2 Bushing Design Tests

3.6.3 Bushing Withstand Test Voltages

3.6.4 Bushing Routine Tests

3.6.5 Bushing Current Transformer Tests

3.6.5.1 Routine Tests

3.6.5.2 Tests Performed After Installation

3.7 TRANSFORMER SHIPMENT, HAULING AND SITE ASSEMBLY

ATTACHMENTS:

T2 Doble Report

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SECTION 48 19 23.04 26 Page 4

SECTION 48 19 23.04 26

CLASS II GSU POWER TRANSFORMER (T2)

PART 1 GENERAL

1.1 DESCRIPTION OF WORK

1.2 GENERAL INFORMATION

1.2.1 Transformer Location

The single-phase transformers specified in this section will be spare transformers for Little Goose, Lower Granite, and Lower Monumental dams.

These transformers are meant to be a spare for the single-phase T2 Bank transformers at the three Projects. Contract Drawing G-003 of Volume, shows the site map and the storage yard where the spare transformers will be placed. The spare transformers will placed on concrete pads in the storage yard. See supplemental drawing LMP-5-6-1A5/1 for details on the existing transformer mounting pads.

1.2.2 Ratings

Size the new single-phase power transformers per the requirements of paragraph, "Ratings and Electrical Characteristics", to match the impedance, capacitance, and ratings of the existing single phase transformers.

1.3 REFERENCES

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

AMERICAN SOCIETY OF CIVIL ENGINEERS (ASCE)

ASCE 7-22 (2022; Supp 1 2023; Supp 2 2023) Minimum Design Loads and Associated Criteria for Buildings and Other Structures

AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME)

ASME B1.1 (2024) Unified Inch Screw Threads (UN, UNR, and UNJ Thread Form)

SECTION 48 19 23.04 26 Page 5

Amend-007

Amendment-007

This Section covers the manufacturing and factory testing of Two (2) single-phase generator step-up (GSU) power transformers rated 82,000 / 109,334 kVA, 500 kV high-voltage (H), 13.2 kV low-voltage (X & Y), Class ONAN/ONAF cooling, for delivery f.o.b. to Little Goose Lock & Dam storage yard. The transformer design can be a core-form or a shell-form transformer design as long as the transformer meets the critical dimensions identified on the contract drawings. Each transformer shipment, hauling, site reassembly, field testing are as required in SECTION 48 20 00.04 26, TRANSFORMER SHIPMENT, HAULING AND SITE ASSEMBLY. Throughout this Section, the transformer tank layout is identified on by Segments 1 through 4, as defined in IEEE C57.12.10, Figure 1, and indicated on the contract drawings.

g4ecctgh Line Amendment-007 - Section 48 19 23.04 26 - Revised Article 1.1.

g4ecctgh

Amendment-007 - Section 48 19 23.04 26 - Revised Article 1.1 (Continued).

ASME B1.20.1 (2013; R 2018) Pipe Threads, General Purpose (Inch)

ASME B16.1 (2020) Gray Iron Pipe Flanges and Flanged Fittings Classes 25, 125, and 250

ASME B16.24 (2022) Cast Copper Alloy Pipe Flanges, Flanged Fittings, and Valves Classes 150, 300, 600, 900, 1500, and 2500

ASME B31.1 (2024) Power Piping

ASME BPVC SEC IX (2023) BPVC Section IX-Welding, Brazing and Fusing Qualifications

AMERICAN SOCIETY FOR NONDESTRUCTIVE TESTING (ASNT)

ANSI/ASNT CP-189 (2020) ASNT Standard for Qualification and Certification of Nondestructive Testing Personnel

ASTM INTERNATIONAL (ASTM)

ASTM A53/A53M (2024) Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless

ASTM A123/A123M (2024) Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products

ASTM A153/A153M (2023) Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware

ASTM A343/A343M (2014; R 2019) Standard Test Method for Alternating-Current Magnetic Properties of Materials at Power Frequencies Using Wattmeter-Ammeter-Voltmeter Method and 25-cm Epstein Test Frame

ASTM A664 (2015; R 2022) Standard Practice for Identification of Standard Electrical Steel Grades in ASTM Specifications

ASTM A717/A717M (2012; R 2022) Standard Test Method for Surface Insulation Resistivity of Single-Strip Specimens

ASTM A876 (2017; E 2017) Standard Specification for Flat-Rolled, Grain-Oriented, Silicon-Iron, Electrical Steel, Fully Processed Types

ASTM D923 (2015; R 2023) Standard Practices for Sampling Electrical Insulating Liquids

ASTM D1535 (2014; R 2023) Standard Practice for Specifying Color by the Munsell System

SECTION 48 19 23.04 26 Page 6

ASTM D3487 (2024) Standard Specification for Mineral Insulating Oil Used in Electrical Apparatus

AMERICAN WELDING SOCIETY (AWS)

AWS A2.4 (2020) Standard Symbols for Welding, Brazing, and Nondestructive Examination

AWS D1.1/D1.1M (2020; Errata 1 2021) Structural Welding Code - Steel

AWS D1.6/D1.6M (2017) Structural Welding Code - Stainless Steel

INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS (IEEE)

IEEE 693 (2018) Recommended Practice for Seismic Design of Substations

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

IEEE C57.12.00 (2021) General Requirements for Liquid-Immersed Distribution, Power, and Regulating Transformers

IEEE C57.12.10 (2017) Requirements for Liquid-Immersed Power Transformers

IEEE C57.12.70 (2020) Standard Terminal Markings and Connections for Distribution and Power Transformers

IEEE C57.12.80 (2010) Standard Terminology for Power and Distribution Transformers

IEEE C57.12.90 (2021) Test Code for Liquid-Immersed Distribution, Power, and Regulating Transformers

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

IEEE C57.19.00 (2023) Standard General Requirements and Test Procedures for Outdoor Power Apparatus Bushings

IEEE C57.19.01 (2017) Performance Characteristics and Dimensions for Power Transformer and Reactor Bushings

IEEE C57.104 (2019; E 2019) Guide for the Interpretation of Gases Generated in Oil-Immersed Transformers

IEEE C57.113 (2023) Recommended Practice for Partial Discharge Measurement in Liquid-Filled

SECTION 48 19 23.04 26 Page 7

Power Transformers and Shunt Reactors

IEEE C57.116 (2022) Guide for Transformers Directly Connected to Generators

IEEE C57.149 (2012) Guide for the Application and Interpretation of Frequency Response Analysis for Oil-Immersed Transformers

IEEE C57.152 (2013) Guide for Diagnostic Field Testing of Fluid-Filled Power Transformers, Regulators, and Reactors

MANUFACTURERS STANDARDIZATION SOCIETY OF THE VALVE AND FITTINGS

INDUSTRY (MSS)

MSS SP-72 (2010a) Ball Valves with Flanged or Butt-Welding Ends for General Service

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)

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

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

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

NEMA ICS 2 (2000; R 2020) Industrial Control and Systems Controllers, Contactors, and Overload Relays Rated 600 V

NEMA MW 1000 (2023) Magnet Wire

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

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 70 (2023; ERTA 1 2024; TIA 24-1) National Electrical Code

UL SOLUTIONS (UL)

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

- Part 8: Class J Fuses

UL 360 (2013; Reprint Jan 2024) UL Standard for Safety Liquid-Tight Flexible Metal Conduit

UL 489 (2025) UL Standard for Safety Molded-Case Circuit Breakers, Molded-Case Switches and Circuit-Breaker Enclosures

UL 508 (2024) Industrial Control Equipment

SECTION 48 19 23.04 26 Page 8

UL 508A (2018; Reprint Jul 2022) UL Standard for Safety Industrial Control Panels

UL 514B (2012; Reprint Mar 2024) UL Standard for Safety Conduit, Tubing and Cable Fittings

UL 969 (2017; Reprint May 2023) UL Standard for Safety Marking and Labeling Systems

UL 1203 (2023; Reprint May 2024) UL Standard for Safety Explosion-Proof and Dust-Ignition-Proof Electrical Equipment for Use in Hazardous (Classified) Locations

UL 4248-8 (2024) Fuseholders - Part 8: Class J

1.4 SUBMITTALS

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

submittals not having a "G" designation are for information only or as otherwise designated. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. Submit the following in accordance with SECTION 01 33 00 , "SUBMITTAL PROCEDURES", unless otherwise indicated below:

SD-01 Preconstruction Submittals

Welding Quality Control Plan ; G, HDC

Submit for approval the welding quality control plan a minimum of 60 calendar days prior to the start of tank manufacturing.

(see paragraph "Welding Quality Control Plan").

SD-02 Shop Drawings

a. Outline and Assembly Drawings ; G, HDC

Submit outline and assembly drawings of the transformer for approval no later than 240 calendar days prior to the start of transformer fabrication to demonstrate that the equipment will conform to the requirements and intent of the specifications.

b. Detail Drawings ; G, HDC

Submit detail drawings for approval not later than 180 calendar days prior to the start of transformer fabrication to demonstrate that the equipment will conform to the requirements of the specifications.

SD-03 Product Data

Submit for approval the product data no later than 120 calendar days prior to the start of transformer fabrication to demonstrate that the welding materials will conform to the requirements of the specifications.

a. Welding Electrodes and Rods ; G, HDC

b. Shielding Gas ; G, HDC

SECTION 48 19 23.04 26 Page 9

SD-05 Design Data

a. Transformer Design Data Review Report ; G, HDC

Submit for approval a transformer design data review report within 14 calendar days of the design data review meeting, to demonstrate fully that all parts of the equipment will conform to the requirements and intent of the specifications.

b. Descriptive Data ; G, HDC

Submit for approval the descriptive data and catalog data of all accessory devices, ancillary equipment and gaskets to be provided with the transformer within 210 calendar days after date of award, to demonstrate fully that all parts of the equipment will conform to the requirements and intent of the specifications. (see paragraph "Descriptive Data")

c. Spare Parts List ; G, HDC

Submit for approval a listing of all required spare parts to be provided with the transformer within 210 calendar days after date of award. (see paragraph "SPARE PARTS")

d. Structural Design Criteria and Seismic Calculations ; G, HDC

Submit for approval the structural design criteria and seismic calculations within 45 calendar days after outline and assembly drawing approval. Perform design criteria and calculations utilizing civil or structural engineers who are presently registered professional engineers (PE) in any state or territory of the United States, and provide a cover sheet for the submittal which is stamped or sealed and signed by a PE.

e. Cabinet Heater Sizing Calculations ; G, HDC

Submit for approval the calculations not later than 180 calendar days prior to the start of transformer fabrication to verify the ratings of the transformer control and power cabinet heaters, based upon the cabinet sizes, cabinet material, and the regional ambient temperature conditions as shown in Contract Drawing G-005. See paragraph "Lighting, Convenience Receptacle, and Cabinet Heaters" for information.

SD-06 Test Reports

a. Transformer Factory Acceptance Test Report ; G, HDC

Submit for approval the transformer factory acceptance test report not later than 14 calendar days following completion of the factory acceptance tests. (see paragraph "Factory Acceptance Test Report").

b. Bushing Design Tests ; G, HDC

Submit for approval the transformer bushing design test reports not later than 30 calendar days following completion of the tests (see paragraph "Bushing Design Tests"). If certified copies of

SECTION 48 19 23.04 26 Page 10 bushing design tests previously conducted within ten (10) years are submitted in-lieu of new test results, submit them when the bushing selection is made, but not later than 60 calendar days prior to the performance of transformer factory acceptance tests.

c. Bushing Routine Tests ; G, HDC

Submit for approval the transformer bushing routine test reports not later than 30 calendar days following completion of the tests.

(see paragraph "Bushing Routine Tests").

d. Bushing Current Transformer Tests ; G, HDC

Submit for approval the transformer bushing current transformer test reports not later than 30 calendar days following completion of the tests. (see paragraph "Bushing Current Transformer Tests").

g. Weld Inspection and Test Report ; G, HDC

Submit for approval the weld inspection and test report not later than 14 calendar days following completion of the weld inspections and tests. (see paragraph "Weld Inspections, Tests and Weld Inspector Qualifications").

SD-07 Certificates

a. Transformer Oil Certification ; G, HDC

Submit for approval the transformer oil certification documents a minimum of 7 calendar days prior to the delivery of transformer oil to the Little Goose Lock & Dam "Storage Yard". (see paragraph "Quantity and Transformer Oil Certification").

b. Notification of the Date of the Transformer Design Data Review Meeting ; G, HDC

Notify the COR 30 calendar days in advance of when the transformer manufacturer will be ready for performance of a design data review meeting, to be held at the manufacturer's facility.

If the meeting is to be held in a foreign country, notify the COR in writing of the meeting dates a minimum of 60 days prior to the proposed meeting date. (see paragraph "TRANSFORMER DESIGN DATA

REVIEW MEETING").

c. Notification of the Date of Factory Tests ; G, HDC

For transformer manufacturers located in the United States , notify the COR 30 calendar days in advance of when the transformer manufacturer will be ready for factory acceptance tests, so that the tests may be witnessed by a Government Representative at the manufacturer's facility.(see paragraph "TRANSFORMER FACTORY

ACCEPTANCE TESTS").

For transformer manufacturers located in foreign countries , notify the COR 60 calendar days in advance of when the transformer manufacturer will be ready for factory acceptance tests, so that the tests may be witnessed by a Government Representative at the manufacturer's facility.(see paragraph "TRANSFORMER FACTORY

ACCEPTANCE TESTS").

SECTION 48 19 23.04 26 Page 11

d. Welder Qualifications ; G, HDC

Submit for approval the welding operators and welders qualifications a minimum of 60 calendar days prior to their performance of work. (see paragraph "Welder Qualifications").

e. Weld Inspector Qualifications ; G, HDC

Submit for approval the qualifications for the Contractor's Quality Assurance personnel responsible for performing weld inspections a minimum of 60 calendar days prior to the performance of weld inspections. (see paragraph "Inspection and Weld Inspector Qualifications").

SD-08 Manufacturer's Instructions

a. Factory Test Procedures ; G, HDC

Submit for approval the transformer factory test procedures a minimum of 60 calendar days prior to the performance of the factory acceptance tests. (see paragraph "TRANSFORMER FACTORY

ACCEPTANCE TESTS").

b. Welding Procedures ; G, HDC

Submit for approval the welding procedures and specifications, and copies of test reports, a minimum of 60 calendar days prior to the performance of work. (see paragraph "Welding Procedure").

c. Prequalified Weld Procedures ; G, HDC

Submit for approval the applicable prequalified weld procedures per the requirements of AWS a minimum of 60 calendar days prior to the performance of work. (see paragraph "Welding Procedure").

1.5 TRANSFORMER WARRANTY REQUIREMENTS

1.5.1 General Warranty Requirements

In addition to the requirements outlined in FAR 52.246-18, provide a manufacturer’s warranty for the power transformers for a period of 5 years from the date of final acceptance of the work. Provide a warranty certificate for each transformer indicating the date of expiry, to be included in the final Operations and Maintenance Instructions. The following transformer issues will also be considered warranty repair items:

a. Transformer gassing quantities or rates exceeding the DGA Status 1 level as defined in Figure 2 Tables 1 through 4 of IEEE C57.104 .

b. Transformer oil leaks, at welded joints as well as gasketed connections and valve stem packing.

c. Paint failures resulting in visible loss of adhesion through bubbling, flaking, peeling, or any visible rust due to paint failure.

d. Transformer bushing dielectric integrity and oil leaks.

e. Transformer control cabinet heater functionality.

SECTION 48 19 23.04 26 Page 12

1.5.2 Devices Exempt from the Transformer Full Warranty Period

Transformer ancillary devices which are not manufactured by the transformer manufacturer are subject to the device manufacturer's standard warranty period, and are exempt from the 5 year duration of the transformer warranty period. All ancillary devices which are not manufactured by the transformer manufacturer, such as gauges, have a minimum 1-year warranty or the part's manufacturer's guaranteed warranty, whichever is higher of the two.

PART 2 PRODUCTS

2.1 TYPE AND RATING

2.1.1 General

The transformers to be furnished under these specifications must be single-phase, three-winding, with one high-voltage and dual low-voltage windings, oil-immersed type suitable for outdoor operation. The transformers must be self-cooled/forced air-cooled type, Class ONAN/ONAF, and must be of a design that has an established record of satisfactory operation with the type of oil preservation system specified, and manufactured suitable for shipment by sea transportation, railcar, and trucking by heavy hauler. The transformers are a step-up transformer to be used in direct connection with electrical power generators and will be subject to backfeed mode as defined in IEEE C57.116 . The transformer design must be of a design that has an established record of satisfactory operation in this type of configuration.

2.1.2 Transformer Limiting Dimensions and Equipment Arrangement

Provide transformers with the layout, equipment arrangement and dimensional requirements as indicated on contract drawings.

2.1.3 Requirements

Except as otherwise specified herein, the transformers, accessories, and spare parts must conform to the applicable requirements of IEEE C57.12.00 , IEEE C57.12.10 , IEEE C57.12.70 , IEEE C57.12.80 and IEEE C57.12.90 , and

IEEE C57.116 .

2.1.4 Standard Products

Provide material and equipment which are standard products from a manufacturer that is regularly engaged in their production, and are items that have been commercially available for at least 3 years prior to bid opening, unless otherwise specifically approved. All materials must conform to the requirements of these specifications. Materials must be of industrial quality, free from defects and imperfections, presently being manufactured, and of the classification and grades designated. If the Contractor desires for any reason to deviate from the standards designated in these specifications, submit for approval a statement describing the exact nature of the deviation, including complete specifications for the materials that are being proposed for use.

2.1.5 Descriptive Data

Submit for approval descriptive data for all transformer equipment, which

SECTION 48 19 23.04 26 Page 13 includes catalog and technical data of sufficient detail to verify conformance with the requirements, herein. Highlight or circle the catalog and technical data for the specific device and model, and provide ordering information and cut sheets. The descriptive data is to include the following at a minimum:

1. Electrical core steel, including country of origin

2. Winding conductors, including country of origin

3. Gasket type and material

4. Valves (each type)

5. Oil sampling device

6. Radiators

7. Cooling fans (including wiring connection methods)

8. Nitrogen regulator cabinet and nitrogen bottles if providing a nitrogen gas pressure system of oil preservation

9. Bushings (each type and rating)

10. Core ground bushings

11. Bushing current transformers

12. Bushing current transformer terminal boxes

13. Thermowells

14. Oil level indicator

15. Oil temperature indicator

16. Winding temperature indicator, including associated equipment

17. Pressure relief device, including discharge piping

18. De-energized tap changer, including operating handwheel

19. Rapid Pressure Rise Relay and Seal-in

20. Personal fall arrest system

21. Insulating oil, including vendor and inhibitor

22. Control and power cabinet vibration isolators

23. Fiber-optic probes

24. Fiber-optic tank feed-through plate and connectors

25. Auxiliary power transformer and mounting cabinet

26. Magnetic contactors

27. Molded-case circuit breakers (each type and rating)

28. 480 VAC circuit breaker locking provisions

29. Auxiliary relays

30. Undervoltage relays

31. Control and instrument switches

32. Terminal blocks (each type)

33. Fuses

34. Fuse holders

35. Wire duct

36. Cabinet lighting

37. GFCI receptacle

38. Cabinet heaters

39. Cabinet grounding busbar

40. Cabinet ventilation

41. Thermostat / humidistat

42. Insulated wire and cable (each type) and signal cable

43. Wire labeling method

44. Device nameplate method

45. Conduit and fittings

46. Junction boxes

47. Impact recorders for shipment (analog & digital)

If providing a conservator tank system of oil preservation include descriptive data of the following:

48. Conservator tank bladder

SECTION 48 19 23.04 26 Page 14

49. Dehydrating breather

50. Buchholz relay

2.1.6 Ratings and Electrical Characteristics

The ratings and electrical characteristics of the transformers must be as follows:

a. Continuous rating, at the 65 degrees-C temperature rise, of the high-voltage winding at all taps, kVA:

(1) ONAN Rating: 82,000

(2) ONAF Rating: 109,334

b. Continuous rating, at the 65 degrees-C temperature rise, of each low-voltage winding, kVA:

(1) ONAN Rating: 41,000

(2) ONAF Rating: 54,667

b. Frequency, Hz: 60

c. Number of phases: 1

d. Rated voltage, kV:

(1) High-voltage windings: 500

(2) Low-voltage winding X: 13.2

(3) Low-voltage winding Y: 13.2

e. Winding connections (external to the transformer):

(1) High-voltage windings: Grounded-Wye

(2) Low-voltage windings: Ungrounded Delta

f. Impedance, at ONAN rated current between the high-voltage winding and each low-voltage winding, subject to IEEE tolerances, percent:

9.2% (H-X) 9.2% (H-Y)

g. Impedance, at ONAN rated current, between the low-voltage windings (X-Y), as high as feasible for an economic design, but not less than, percent: 20.9%

g. Polarity: Subtractive

h. Basic impulse insulation levels (BIL), kV:

(1) Line ends of the high-voltage windings, not less than: 1425

(2) Neutral ends of the high-voltage windings, not less than: 150

(3) Low-voltage windings, not less than: 110

i. Taps in low voltage windings: None

j. Taps (full capacity) in high voltage winding

(1) Tap 1, percent of high-voltage rating: 107.5

(2) Tap 2, percent of high-voltage rating: 105.0

(3) Tap 3, percent of high-voltage rating: 102.5

SECTION 48 19 23.04 26 Page 15

(4) Tap 4, percent of high-voltage rating: 100.0

(5) Tap 5, percent of high-voltage rating: 97.5

k. Maximum no-load losses at rated voltage and frequency, kW: 52

l. Maximum load losses at maximum ONAN rated kVA and 1.0 power factor, with each low-voltage winding equally loaded, kW: 175

m. Maximum average sound level at rated voltage and frequency, with all cooling groups in operation, dB: 74

n. MaximumExisting Oil Volume, GAL: 10,667

o. Maximum transformer total weight, completely assembled and oil filled with all accessories installed, pounds: 355,000 360,000

p. The transformers' capacitances must match those of the existing transformers and be designed to be compatible with bank of single-phase shell-type transformers. See the T2 Doble Report attachment at the end of the specifications.

2.1.7 Transformer Type

The existing transformers in T2 Bank are shell-type transformers. A shell-form or core-form type transformer design is acceptable and must meet requirements described in these specifications. The transformers design must fit each existing Project connections without modifications to existing equipment and the weight must fit the intake deck loading limitations and any oil quantity restrictions if any. The new transformers must fit within the allowable space and for example, without extending into space for gantry crane. The transformers must be designed to be compatible for operation with the existing single phase shell-type transformers in T2 Bank. The transformers must be able to be transported from manufacturer's location to Little Goose Lock & Dam Storage Yard.

2.1.8 Unusual Service Conditions

2.1.8.1 Magnetic Fields

The transformers will be subject to the following unusual service conditions, as defined by IEEE C57.12.00 , paragraph 4.3:

The transformers' high-current low-voltage bushings will be connected to isolated-phase bus ducts and will exhibit strong magnetic fields during operation, which may cause circulating currents in the transformer tank covers and bus duct housings. Corrective measures must be taken during manufacturing to utilize non-magnetic metals in the cover around the bushings and the bushing housing flanges.

2.1.8.2 Backfeed Mode

The transformers must be designed to operate under IEEE C57.116 related service conditions with the transformers being used as a generator step-up transformer and will be subject to periods of backfeed operation.

2.1.9 Impedance Tolerance

The impedance tolerance between the supplied single-phase transformers and the specified impedance must be limited to a maximum of 3 percent, at the

SECTION 48 19 23.04 26 Page 16

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ONAN self-cooled rating, to reduce circulating currents when wye-connected and assure proper operation of the transformers differential relaying.

2.2 STRUCTURAL DESIGN CRITERIA AND SEISMIC CALCULATIONS

Provide Structural design criteria and seismic calculations for the transformer, to include the main tank and all major components such as bushings, cooling equipment, oil preservation equipment, and cabinets.

2.2.1 Structural Design Criteria

Structural design criteria must include the following:

a. Indicate the industry design standards (ASCE or IEEE) and allowable stresses or capacities to which steel plate, structural steel shapes, welds, bolts and studs must conform.

b. Indicate the industry standards (ASCE or IEEE) used in developing the seismic forces and analysis techniques used in the design of the transformer and transformer components.

c. Provide the seismic design for equipment restraint in accordance with Chapter 13, "Seismic Design Requirements for Nonstructural Components," of ASCE 7-22 with the seismic design force computed as per Section 13.3 "Seismic Demands on Nonstructural Components".

Provide electrical equipment restraint in accordance with the provisions in IEEE 693 Annex D, or Section 13.3 of ASCE 7-22 whichever produces the more adverse seismic effects. For ASCE 7-22 , use a spectral acceleration S DS = 0.32 , I P = 1.5 and z=h=1. Use a moderate seismic qualification level For IEEE 693 .

d. Provide wind load calculations based upon Exposure Category "D" of ASCE 7-22 . Base the effect of wind load forces upon ASCE 7-22 , or 40 psf, whichever is greater.

2.2.2 Transformer Mounting

The transformers must be manufactured with structural bases that meets the requirements of paragraph "Transformer Steel Base, and that rests on the existing concrete pedestals with a steel plate cap as shown in supplemental drawing LMP-5-6-1A5/1.

2.3 THERMAL DESIGN

The temperature rise above ambient temperature of the transformers or parts thereof, when tested in accordance with its ratings, must not exceed the limits of observable temperature rise for oil immersed apparatus as stated in IEEE C57.12.00 (paragraph 5.11.1). The winding temperature rise by resistance must not exceed 65 degrees-C, and the hottest spot winding temperature rise must not exceed 80 degrees-C on the tap connections that give the highest losses, at all self-cooled and forced-air cooled ratings. The transformers must be designed for satisfactory continuous operation with any combination of simultaneous loads on the low-voltage windings within their ratings, and also for the case where either low-voltage winding carries maximum rated load and the other low-voltage winding carries no load.

SECTION 48 19 23.04 26 Page 17

2.4 CORE

The transformers' core steel laminations must be high-quality, non-aging, cold-rolled, grain-oriented steel especially suitable for the purpose, meeting the requirements of ASTM A664 and ASTM A876, and the following:

a. Lamination maximum thickness of 0.270 mm, and the design flux density less than 1.75 Tesla.

b. Electrical core steel core loss, rms exciting power, rms and peak exciting current, and ac permeability design tested in accordance with ASTM A343/A343M , with the design test reports included with the descriptive data.

c. Each roll of sheet steel used must have the surface insulation resistivity tested in accordance with ASTM A717/A717M .

d. The core must be assembled with interleaved joints, and rigidly clamped to ensure mechanical strength to support the windings and to prevent shifting of the laminations during shipment, and also to reduce vibration during operation.

2.5 WINDINGS

The single-phase transformers must be manufactured with windings meeting the requirements of paragraph "Ratings and Electrical Characteristics", consisting of one high-voltage winding (H) and two low-voltage windings (X and Y). Consideration must be given to all factors of service, such as high dielectric and mechanical strength of insulation, coil characteristics, and minimum restrictions to free circulation of oil.

Coils must be made up, shaped, and braced to provide for expansion, contraction, and shrinkage due to temperature changes and aging in service in order to avoid abrasion of insulation and to provide resistance to movement and distortion caused by abnormal operating conditions.

The insulation of the coils must be designed to withstand possible transient voltages that occur when the transformers are operated in backfeed mode and the secondary windings (hi side) are exposed to typical system transients as described in IEEE C57.116 , clause 11. Barriers must be provided between windings and core and between high-voltage and low-voltage windings. End coils must have additional protection against normal line disturbances. The windings must meet the following requirements:

a. Winding conductors manufactured from high-conductivity copper magnet wire meeting the applicable requirements of NEMA MW 1000.

b. Winding assembly of a circular coil fabrication if the transformers are a core-form design.

c. Conductor insulation consisting of thermally upgraded Kraft paper.

d. A de-energized tap changer with taps located in the high-voltage windings. The tap changer contacts must be silvered, and capable of withstanding the full short circuit current of the transformers without injury.

e. Basic impulse insulation level (BIL) of the windings as specified in paragraph "Ratings and Electrical Characteristics", and capable of withstanding IEEE Standard dielectric tests, in accordance with

SECTION 48 19 23.04 26 Page 18 paragraph "Power Transformer Tests", corresponding to the specified winding insulation levels.

f. Capable of withstanding without injury the mechanical and thermal stresses caused by short circuits on the external terminals of any winding or windings, with rated voltages maintained across the terminals of all other windings intended for connection to sources of energy, under the conditions listed in IEEE C57.12.00 (paragraph 7.1.1).

g. Fiber-optic probes embedded in the calculated hottest spot for each high and low-voltage winding duct spacers for direct winding temperature measurement, with quantities and distribution as required in paragraph "Transformer Fiber-Optic Winding Temperature Measurement."

2.6 TANK

2.6.1 FABRICATION

The transformers must be manufactured with an oil-tight steel tank, with oil-tight covers per the requirements of IEEE C57.12.10 (paragraph 5.8), with the following features:

a. The main transformer tanks and any attached compartment that is subjected to operating pressures designed and manufactured to withstand, without leakage or permanent deformation, an internal maximum operating pressure not less than 10 psi.

b. Manufactured for vacuum filling (essentially full vacuum) in the field, with all valves, fittings and piping affected by vacuum filling rated for such filling.

c. Welded joints between the tank and cover, and between tank sections, designed to prevent weld splatter from entering the inside of the tank during the welding process.

d. Positioning guides inside the tank to assure the core and windings are in the correct position during the assembly process, and provide additional rigidity during transportation.

e. One or more unobstructed manholes in the cover with minimum dimensions of 24 inches by 24 inches, or 24 inches minimum diameter, to afford easy personnel access to the inside of the tank and the upper portions of the core and coils.

f. Handhole access covers in the tank sidewall for access to low-voltage bushing bottom connection, and the de-energized tap changer switch mechanism for future maintenance.

g. If providing a conservator tank oil preservation system, the tank must include the necessary pressure equalizing valves to allow for oil-filling under vacuum.

2.6.2 Lifting, Moving and Jacking Facilities

2.6.2.1 Lifting Facilities

Design loads for lifting facilities must have a safety factor of five in accordance with IEEE C57.12.10 (paragraph 5.3.1). Lifting facilities must

SECTION 48 19 23.04 26 Page 19 positively keep the lifting cable in place even when the cable is slack.

Provide transformers with the following lifting facilities:

a. Lifting attachments on the tank cover.

b. Adequate means for lifting the core and coil assembly from the tanks for a core-form design.

c. Lifting facilities and pivot points on the tanks adequate for lifting and pivoting the transformers from the shipping position to the upright position for a shell-form design.

d. Lifting facilities on the tanks adequate for lifting the complete transformer filled with oil. The lifting facilities will also be used for securing of the transformers during shipment.

2.6.2.2 Moving Facilities

Furnish moving facilities in accordance with IEEE C57.12.10 (paragraph 5.3.3).

2.6.2.3 Jacking Facilities

Provide transformers manufactured with jacking facilities to permit jacking the fully assembled transformer filled with oil per the requirements of IEEE C57.12.10 (paragraph 5.3.4). The design loads for jacking facilities must be a minimum of five times the actual loads to allow for possible unequal jacking forces.

2.6.3 Gasketing

2.6.3.1 General

Gaskets between metal surfaces must be set in expansion-limiting grooves so that all contact surfaces are metal-to-metal when tightened. The gaskets must be made of Nitrile NBR (Buna N), with the exception that gaskets for the low-voltage bushings must be fluoroelastomeric rubber , with a Durometer rating between 50 and 70. Circular cross-section gaskets are not acceptable for use in gasket grooves of rectangular cross-section.

2.6.3.1.1 Low-voltage Bushings

The low-voltage bushing gaskets but meet the following requirements:

a. Meets the requirements of ASTM D-1418, designation FKM, Type 2.

b. Must be manufactured with 100% virgin FKM Fluoroelastomer polymer

c. Rated for application in temperature range of -20F to +400F

d. Durometer hardness of 70 (+/- 2)

e. Minimum fluorine content: 66%

2.6.3.2 Sizing

Gasket sizing for rectangular cross-section grooves must be accomplished as follows:

a. Gasket thickness is chosen so that approximately 25-percent of the gasket cross-section protrudes above the depth of the groove, referred to as the 'gasket compression area'.

SECTION 48 19 23.04 26 Page 20

b. The width of the groove minus the width of the gasket determines the space available for gasket expansion during compression. The amount of groove space available for gasket expansion during the compression process is referred to as the 'gasket expansion area', which must be greater than the gasket compression area to avoid pinching of the gasket between the metal surfaces when tightened.

c. Proper sizing coordination between the gasket groove and the gasket cross-sections results in 25-percent gasket compression, with a remaining gasket expansion area after tightening of between 5 and 10-percent.

2.6.4 Valves

Provide valves that conform with IEEE C57.12.10 (paragraph 5.1.8), are of ball-type stainless steel construction conforming to MSS SP-72 , circular flanged mounting, with reinforced PTFE valve seats, unless otherwise specifically indicated. The valves must be of full-port design, designed for use with insulating oil with a 120 degrees Celsius minimum temperature rating and include hasps for locking the handle. Provide the following valves:

a. Upper filter connection . A 1.5 -inch valve with a 1.5 -inch female NPT threaded open-end connection and a threaded plug, located on the tank sidewall such that it can be used to fill the transformers with oil while the transformers are under vacuum.

b. Vacuum pump connection . A 3-inch valve with a 3-inch circular-flanged open-end connection, located on the tank cover for use in connecting a vacuum pump during the vacuum filling process.

Provide a gasketed blind flange cover with an integral 3-inch NPT female connection and threaded plug for the valve open-end connection.

c. Main drain . A 3-inch valve with a 3-inch circular-flanged open-end connection, located at the extreme bottom of the tank for use in gravity draining of the transformer. Provide a gasketed blind flange cover with an integral 3-inch NPT female connection and threaded plug for the valve open-end connection.

d. Oil sampling valve . A 1-inch valve, with a 1/2-inch NPT threaded open-end connection and a 1/2-inch threaded sampling device, complete with protective cover. This valve may be located at the main drain valve location..

e. Lower filter connection . A 1.5 -inch valve with a 1.5 -inch female NPT thread open-end connection and a threaded plug, located at the extreme bottom of the tank.

f. Tank air vents . Threaded plugs for venting the radiators. If providing a conservator tank oil preservation system, valves must be provided for venting of the conservator tank. Schrader valves are not acceptable for use as vent valves.

g. If providing a conservator tank system of oil preservation provide a conservator tank drain valve. A valve must be located at the bottom of the conservator tank for use in gravity draining.

h. If providing a nitrogen gas pressure system of oil preservation provide a nitrogen gas connection . Two 1/2 -inch valves for connection

SECTION 48 19 23.04 26 Page 21 of the nitrogen generator system tubing.

i. Radiator drain . A 1/4 -turn valve at the lowest point of each radiator to permit draining, with an NPT threaded open-end connection and threaded plug.

j. Isolation valves .

(1) Radiators . At the inlet and outlet of each radiator to permit removal without draining the oil from the tank. Radiator isolation valves at the transformer tanks may be of a butterfly type.

(2) Rapid pressure rise relay. 1.5 -inch isolating valve for the rapid pressure rise relay.

(3) Gas-in-oil monitor interface valve. Two 2-inch valves for future connection to the gas-in-oil monitor

(4) Conservator tank . If providing a conservator tank system, provide a valve isolating the conservator tank from the main transformer tanks, and isolating the Buchholz relay. Isolation valves adjacent to the Buchholz relay may be of a butterfly design.

2.6.5 Connections

2.6.5.1 General

All bolts, studs, machine screws, nuts, and tapped holes designed for customer connection must be in accordance with ASME B1.1 (inch fasteners). Bolting hardware must be Grade 8 minimum, or equivalent, and and all hardware not internal to the tank must be galvanized. Threads for sizes 1/4-inch to 1-inch, inclusive, must be NC or UN series. The sizes and threads of all valves, pipe and fittings, conduit and fittings, tubing and fittings, and connecting equipment, must be in accordance with ASME B1.20.1 . Manufacturers' standard threads and construction may be used on small items which are integrally replaceable, except that threads for external connections to these items must meet the above requirements.

2.6.5.2 Stainless Steel

All stainless steel connecting hardware must be installed using an anti-galling compound such as molybdenum disulfide on the threads prior to connection, or the nuts may be of a Nitronic 60 grade material.

2.6.6 Steel Pipe and Fittings

Steel pipe must conform to ASTM A53/A53M, Grade A, Weight Class XS.

Dimensions of terminating flanges must conform to ASME B16.1 and ASME B16.24 . For a conservator tank system, if the bushing turret design is such that any gasses generated may accumulate within the turret enclosure, piping must be provided for the purposes of venting these gases to the conservator tank piping, passing through the Buchholz relay.

2.6.7 Grounding

The transformer tanks must include four ground pads, with grounding provisions in accordance with IEEE C57.12.10 (paragraph 5.5).

SECTION 48 19 23.04 26 Page 22

2.6.8 Portable Fall Arrest System

2.6.8.1 Portable Fall Arrest System Anchor Post

Provide one portable fall arrest system anchor post. The anchor post must have the following features:

a. Three-stage, four-position telescoping design of aluminum construction.

b. Provision of three independent swivel tie-off points, with horizontal lifeline attachment.

c. Base leveling screws allowing the system to be plumbed to vertical for working stability on inclines up to 15-degrees.

d. Designed for attachment to a uni-anchor mounting plate.

2.6.8.2 Anchor Post Accessories

Provide the following accessories with the portable fall arrest system anchor post:

a. Rescue Davit Arm, with quick mount winch and cable.

b. Carrying bag for the anchor post assembly.

c. Carrying bag for the Davit Arm with mounted winch.

2.6.8.3 Mounting Plates

Provide two portable fall arrest system anchor post mounting plates welded on the transformer covers, located so that the center of each manhole access cover is 36-inches from the mounting plate. The mounting plates must be designed for use with the portable fall arrest system anchor post indicated above.

2.6.9 Transformer Steel Base

The transformers must be manufactured with an integral structural steel base designed for meeting the following requirements:

a. Suitable for resting on the existing concrete pedestals with steel caps…