Transformer Purchases RFP.pdf

CITY OF GROTON

GROTON UTILITIES

CONTRACT DOCUMENTS

AND

MATERIAL SPECIFICATIONS

FOR

TRANSFORMER PURCHASES

GU-26-Q14

Due: May 27, 2026

NOTICE TO BIDDERS

CITY OF GROTON, CONNECTICUT

TRANSFORMER PURCHASE

GROTON, CONNECTICUT

PROPOSAL [GU-26-Q14]

The City of Groton, Department of Utilities are requesting price and delivery quotes for “transformer purchases” in accordance with the following specifications and information.

Sealed Proposal for the above work will be received at the office of the Department of Utilities, 295 Meridian St, Groton, Connecticut 06340 until 2:00 P.M., prevailing time, on May 27, 2026.

Copies of the Contract Documents are available from the City of Groton or CTSource websites.

Modifications to the Contract Documents will be made only by written Addenda, duly issued by City of Groton - Groton Utilities. Addenda, if issued, will be posted to the City of Groton and CTSource websites no later than five (5) calendar days prior to the date fixed for opening of bids. Bid modifications and withdrawal are allowed up to the time of bid opening.

Contractors interested in submitting a bid for the above-described work must submit their bid on a prescribed Transformer Quotation Form, provided for this purpose with the Specifications. All blank spaces shall be filled in, in ink or typewritten.

The award for all transformers will be based on an evaluation that includes the cost of the losses as indicated in the attached “Transformer Evaluation” specification. Each manufacturer should indicate both the load loss and no-load loss in its quotation. Delivery must be made via an open truck and transportation charges included in your Quotation Net Delivered Amount. A “Certified Losses Test Report” for each unit must be submitted with your invoice(s).

Contracts will be compared and awarded on the basis of (1) the lowest, responsible, responsive and qualified bidder, (2) the experience and past performance of the Contractor. The City of Groton Utilities Commission reserves the right to accept any bid or to reject any or all bids should the Commission deem it to be in the public interest to do so, or to delete or reduce the scope of any work in order to bring the cost within available funds.

All prospective bidders shall take note that the City of Groton - Groton Utilities is exempt from the payment of State of Connecticut sales tax.

Dated this 8th Day of May, 2026.

City of Groton - Groton Utilities

Dominic Jengo Purchasing Agent

TABLE OF CONTENTS

Section Page Numbers

Information for Respondents .................................................................. 4 -- 6

1.0 General Information

2.0 Proposals

3.0 Acceptance or Rejection of Proposal

4.0 Supplemental Information

5.0 Exception to Specifications

6.0 Equipment Rejection

7.0 Inquiries

8.0 Basis for Selection of Respondent

9.0 Proposal Alterations/Sidetrack Agreements

10.0 Ambiguity

General Conditions.................................................................................. 7 -- 11 Article 1 Definitions Article 2 Term Article 3 Indemnification Article 4 Default and Termination Article 5 Non-Collusion Article 6 Compliance with Laws Article 7 Non-Discrimination and Affirmative Action Article 8 OSHA Requirements Article 9 Arbitration Article 10 Notices Article 11 Venue and Governing Law Article 12 Severability Article 13 Amendments and Modifications

Technical Specifications

Material Specifications & Transformer Purchase Evaluation…………...13-19

Mandatory Proposal Forms……………………………………………………20-23

Form 1 Certifications Form 2 Quotation Form GU-26-Q14

Exhibits I Form of Contract

INFORMATION FOR RESPONDENTS

1.0 GENERAL INFORMATION

1.1 Purpose

This Request for Proposals is being issued to solicit proposals from qualified respondents willing to provide electric distribution transformers.

The defined terms in the General Conditions shall apply to all contract documents.

1.2 Quotes

Groton Utilities is accepting price and delivery quotations for the following new units:

Item No. Quantity Description

1 3 150 kVA 3Ø Padmount Transformers

2 2 225 kVA 3Ø Padmount Transformers

ABOVE UNITS

Primary voltage 13,800Y/7970, with DEAD FRONT LOOP FEED primary. Secondary voltage 120/208Y with spade lugs.

Units to have NO primary taps and conform to the attached specification (Three Phase Pad-Mounted Transformers T-630), Table I – Line 3

3 5 750 kVA 3Ø Padmount Transformer

ABOVE UNIT

Primary voltage 13,800Y/7970, with DEAD FRONT LOOP FEED primary. Secondary voltage 120/208Y with spade lugs.

Units to have NO primary taps and conform to the attached specification (Three Phase Pad-Mounted Transformers T-630), Table I – Line 4

2.0 PROPOSALS

2.1 Submission

Sealed Bids for the above work will be received at the office of the Department of Utilities, 295 Meridian St, Groton, Connecticut 06340 until 2:00 P.M., prevailing time, on May 27, 2026. Proposals received after that date and time would not be considered.

Proposals must be submitted on the blank forms furnished, and shall be in a sealed envelope, marked “City of Groton - Groton Utilities, TRANSFORMER PURCHASES, GU-26-Q14” made to the attention of: PURCHASING AGENT.

2.2 Withdrawal of Proposals

Proposals may be withdrawn by written authorization from City of Groton - Groton Utilities if, and only if, City of Groton - Groton Utilities, one (1) day or more prior to the deadline established for receipt of proposals, receives a withdrawal request. No respondent may withdraw or change its proposal for a period of 60 days after the actual date of the opening of proposals, during which time prices will be firm.

2.3. Duration of Proposals

Proposals must be valid for 60 days after the actual date of the opening of proposals.

2.4 Cost for Preparation of Proposals

Costs for the preparation of the proposal are to be borne entirely by the respondent.

They shall not in any way be charged to City of Groton - Groton Utilities. All submissions become the property of the City of Groton - Groton Utilities to use as required to meet the objectives of this Request for Proposals.

3.0 ACCEPTANCE OR REJECTION OF PROPOSAL

City of Groton - Groton Utilities reserves the right to accept or reject in part or in whole, any or all proposals and to waive irregularities and/or informalities in any proposal and to make an award in any manner consistent with law deemed in the best interest of the City.

4.0 SUPPLEMENTAL INFORMATION

The respondent must submit with the proposal detailed specifications, descriptive literature and all necessary details on the transformers that it proposes to furnish in order that City of Groton - Groton Utilities may have full information available when analyzing the Proposals.

Respondents are invited to provide any and all additional information, which it believes, may assist City of Groton - Groton Utilities in the favorable evaluation of the proposal.

5.0 EXCEPTION TO SPECIFICATIONS

If the transformers offered differs from the provisions contained in this specification, such differences must be explained in detail on the sheets attached to the proposal. If such deviations do not depart from the intent of this notice and are in the best interest of City of Groton - Groton Utilities, the Proposal will receive careful consideration.

The absence of written deviations will hold the respondent strictly accountable to City of Groton - Groton Utilities to the specifications as written.

6.0 EQUIPMENT REJECTION

City of Groton - Groton Utilities has the right to reject equipment (transformers) if they do not meet the intent of the specifications.

7.0 INQUIRIES

Up to and including May 19, 2026, City of Groton - Groton Utilities will accept written comments from prospective respondents requesting explanations of proposal documents. Comments regarding the proposal shall be directed to Dominic Jengo, Purchasing Agent at jengod@cityofgroton-ct.gov. Written requests shall be sent to City of Groton - Groton Utilities, 295 Meridian St, Groton, CT 06340 addressed to the attention of Dominic Jengo, Purchasing Agent.

If explanations are to be provided, a written addendum will be posted to the City of Groton and State of Connecticut websites.

Any verbal statements regarding same by any person prior to the award are unauthorized and shall be of no effect and not binding on City of Groton - Groton Utilities.

Addenda issued to prospective respondents prior to date of receipt of proposals shall become a part of the contract documents, and all proposals shall include the work described in the addenda.

No inquiry received after May 19, 2026 will be given consideration.

8.0 BASIS FOR SELECTION OF RESPONDENT

City of Groton - Groton Utilities retains the right to reject all proposals, in part or in whole, and to waive defects, informalities or irregularities in any Proposal.

Selection of the supplier will be based on multiple criteria, including the overall benefit to the City of Groton - Groton Utilities. Factors which will be considered in the evaluation generally include:

Experience identical to or related to that required under this procurement, that is the supply and delivery of distribution transformers;

City of Groton - Groton Utilities evaluation of the proposed prices, projected lifetime costs; and delivery times.

Following the evaluation, a firm, or firms, will be selected for award or all proposals will be rejected.

9.0 PROPOSAL ALTERATIONS/SIDETRACK AGREEMENTS

No alterations or sidetrack agreements changing the specifications shall be valid unless made in writing to City of Groton - Groton Utilities.

10.0 AMBIGUITY

In case of ambiguity or lack of clearness in stating prices in the proposal, City of Groton - Groton Utilities shall have the right to construe such prices in a manner most advantageous to City of Groton - Groton Utilities or to reject the proposal.

GENERAL CONDITIONS

ARTICLE 1 - DEFINITIONS

The following definitions are used in this specification:

“Contract” means this “Distribution Transformers GU-26-Q14” Contract between the City of Groton - Groton Utilities and the Contractor, which includes the following documents, expressly incorporated herein:

The Instructions to respondents;

The General Conditions;

Technical and Material Specifications;

The Transformer Purchase Evaluation Document;

The Groton Utilities Transformer Quotation Form;

The Contractor’s proposal, and all forms and appendices to it;

Exhibits to this Specification;

Any written addenda or written changes to the foregoing documents agreed to by the parties hereto.

“Contract Documents” This Contract, Instructions to Respondents, General Conditions, Technical and Material Specifications, Transformer Purchase Evaluation and Quotation Form, Exhibits, Contractor’s Proposal, and any addenda or changes to the foregoing documents issued by City of Groton - Groton Utilities before proposals are opened.

“Contractor” means the person, corporation, Limited Liability Company, partnership, or other entity performing under a contract with City of Groton - Groton Utilities.

“Hours of operation” are Monday through Friday 0700 to 1500 hours. No work on City Holidays.

ARTICLE 2 - TERM

The term of this Contract will commence at contract execution and shall expire upon completion of tasks as agreed upon.

ARTICLE 3 - INDEMNIFICATION

To the extent provided by law, the Contractor, subcontractor and any of their employees, officers, directors, volunteers, or associates involved in the project, shall indemnify, pay for the cost of defense and save harmless City of Groton - Groton Utilities from any and all loss cost and damages including Attorney’s fees and/or litigation expenses, which may be brought or made against or incurred by City of Groton - Groton Utilities on account of loss of or damage to any property, or for injuries or death of any person or persons caused by, arising out of or contributed to, by reasons of a negligent act, omission, professional error, fault or mistake of the Contractor as a result of the activities of the Contractor while in the performance of this Contract and for any other period as described in the specifications and contract for services.

The Contractor, subcontractor, anyone directly or indirectly employed by any of them or anyone for whose acts any of them may be liable will be held responsible for any type of pollution and/or environmental impairment into or upon the land, the atmosphere or any course or body of water that is above or below ground; and is caused in whole or in part by any of the above stated individuals or group of individuals.

City of Groton - Groton Utilities is not responsible for any loss of, damage to, theft, vandalism, destruction or disappearance of any equipment or belongings, used or owned by the Contractor or that is owned, rented, or leased by any subcontractor, employee, officer, director or associate of the Contractor while in performance of this Contract.

ARTICLE 4 - DEFAULT AND TERMINATION

4.1 Default

City of Groton - Groton Utilities may declare the Contractor in default of this Contract by written notice to the Contractor and its surety for any of the following reasons:

(a) Failure of the Contractor to commence work operations within the time specified in the Contract.

(b) Failure of the Contractor to provide the electric distribution transformers, and all obligations ancillary there to, pursuant to this Contract.

(c) The Contractor’s insolvency, bankruptcy or inability to pay its debts as they come due, or an assignment by the Contractor for the benefit of its creditors, or appointment of a receiver on account of the Contractor’s insolvency, or the admission in writing by the Contractor of any of the above.

(d) The unauthorized assignment of this Contract or any funds due therefrom.

(e) Failure to supply complete and accurate information, records or accounts as provided herein.

(f) The inaccuracy in any material respect of any statement, representation, or warranty made by Contractor in any of the Contract Documents.

(g) Any act by the Contractor, which breaches or is inconsistent with any statement, warranty, or representation set forth in any of the Contract Documents.

(h) Failure of the Contractor to observe or perform any term, covenant or obligation imposed upon it by the Contract Documents or the rules and regulations of City of Groton - Groton Utilities.

ARTICLE 5 – NON-COLLUSION

The undersigned bidder, having fully informed themselves regarding the accuracy of the statements made herein, agrees to abide by the conditions set forth in the attached bid document, and certifies that:

a) The bid has been arrived at by the bidder independently and has been submitted without collusion and without any agreement, understanding, or planned common course of action designed to limit independent bidding or competition, with any other vendor of materials, supplies, equipment or services described in the invitation to bid.

b) The bidder has submitted this bid without collusion with the City of Groton, any of its affiliated companies, or any employee thereof, and is unaware of any direct, personal pecuniary interest of any employee of the City of Groton or any of its affiliated companies in the outcome of this bid.

c) The bidder has not communicated the contents of the bid to its employees or agents to any person not an employee or agent of the bidder or its surety on any bond furnished with the bid, and will not be communicated to any such person prior to the official opening of the bid.

d) The contractor has not been debarred, suspended or excluded from any publicly funded projects or programs.

ARTICLE 6 – COMPLIANCE WITH LAWS

The Bidder shall comply with all federal, state and local laws and regulations and shall procure all necessary license and permits, pay all charges and fees and give all notice necessary and incident to the due and lawful performance of the contract and bid process. Such laws shall include, without limitation, the following:

ARTICLE 7 – NON-DISCRIMINATION AND AFFIRMATIVE ACTION

Contractor, in performing under this contract, shall not discriminate against any worker, employee or applicant, or any member of the public, because of race, creed, color, age, marital status, sexual orientation, national origin, ancestry, sex, mental retardation or physical disability, including but not limited to blindness, unless it is shown by the contractor that such disability prevents performance of the work involved in any manner prohibited by the laws of the United States or the State of Connecticut, nor otherwise commit an unfair employment practice. Contractor further agrees that this article, (and any additional provisions required by law), will be incorporated by contractor in all contracts entered into with suppliers of materials or services contractors and sub-contractors and all labor organizations, furnishing skilled, unskilled and craft union skilled labor or who may perform any such labor or services in connection with this contract. The following principles and requirements of Equal Opportunity and Affirmative Action, as incorporated herein, will be incorporated into "Equal Opportunity - Non-Discrimination Clause" are hereby deemed to be included in all City bid documents, purchase orders, lease and contracts entered into with the City. The principles of Affirmative Action are addressed in the 13th, 14th and 15th Amendments of the United States Constitution, Civil Rights Act of 1964, Equal Pay Act of 1963, Title VI and VII of the 1964 United States Civil Rights Act, Presidential Executive Orders 11246, 11375, 11478 (nondiscrimination under federal contracts), Act 1, Section 1 and 20 of the Connecticut Constitution, Governor Grasso's Executive Order Number 11, Governor O'Neill's Executive Order Number 9, the Connecticut Fair Employment Practices Law (Sec. 46a-60-69) of the Connecticut General Statutes (CGS), Connecticut Code of Fair Practices (46a-70-81), Deprivation of Civil Rights (46a-58 (a)(d) ), Public Accommodations Law (46a-63-64), Discrimination against Criminal Offenders (46a-80), definition of blind (46a-51(1)), definition of Physically Disabled (46a-51 (15) ), definition of Mentally Retarded (46a-51-13 ), cooperation with the Commission on Human Rights and Opportunities (46a-77), Sexual Harassment (46a-60 (a)-8), Connecticut Credit Discrimination Law (360436 through 439), Title 1 of the State and the Local Fiscal Assistance Act 1 1972. If a project is funded in whole or in part by State funds, CGS Sections 46a-68c through 46a-68k apply to contractors. These Sections trigger affirmative action plan requirements for contractors and the filing of compliance reports with the State by contractors.

ARTICLE 8 – OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION

REQUIREMENTS

According to CGS, Section 31-53b (a) each contract entered into on or after July 1, 2009, for the construction, remodeling, refinishing, refurbishing, rehabilitation, alteration or repair of any public building project by the state or any of its agents, or by a political subdivision of the state or any of its agents, where the total cost of all work to be performed by all contractors and subcontractors in connection with the contract is at least $100,000 shall contain a provision requiring that, not later than thirty days after the date such contract is awarded, each contractor furnish proof to the Labor Commissioner that all employees performing manual labor on or in such public building, pursuant to such contract, have completed a course of at least ten hours in duration in construction safety and health approved by the federal Occupational Safety and Health Administration or, in the case of telecommunications employees, have completed at least ten hours of training in accordance with 29 CFR 1910.268. The aforesaid provisions shall be deemed to be incorporated into the Contract with the City. The contractors should familiarize themselves with all aspects of state law and any applicable regulations pertaining to these requirements in order to ensure full compliance.

ARTICLE 9 - ARBITRATION

It is agreed between the parties that any claims, disputes, or other matters concerning the terms and conditions of this Contract or arising out of its performance which cannot be resolved between the parties shall be referred to the American Arbitration Association in Hartford, Connecticut for resolution through arbitration in accordance with the rules and regulations thereof. No arbitration shall include by consolidation, joinder or in any other manner, parties other than City of Groton - Groton Utilities and the Contractor without the assent of both parties. The Contractor’s right to arbitration shall not affect City of Groton - Groton Utilities right to terminate this Contract.

ARTICLE 10 - NOTICES

Notices by either party to the other party shall be sufficient if sent by certified mail, postage paid, return receipt requested, or express mail, addressed to the other party at the addresses designated below each party’s signature hereunder.

ARTICLE 11 - VENUE AND GOVERNING LAW

This Contract shall be deemed to have been made in Groton, Connecticut, regardless of the order in which the signatures of the parties shall be affixed hereto. This Contract shall be governed, construed and interpreted and the rights and liabilities of the parties determined in accordance with the laws of the State of Connecticut, exclusive of its choice of law rules. Should any action, whether real or asserted, at law or in equity, arise out of the terms and conditions of this Contract, venue for said action shall be in New London Judicial District in Connecticut.

ARTICLE 12 - SEVERABILITY

In case any one or more of the provisions contained in this Contract shall, for any reason, be held to be invalid, illegal or unenforceable in any respect, such invalidity, illegality or unenforceability of any provision of this Contract or the Contract Documents shall not affect any other provision of this Contract or the Contract Documents, and this Contract and the Contract Documents shall be construed as if such invalid, illegal or unenforceable provisions had not been stated herein.

ARTICLE 13 - AMENDMENTS AND MODIFICATIONS

All provisions of this Contract, including the Contract Documents, shall be strictly complied with and conformed to by the Contractor, and no amendment to this Contract shall be made except upon the written consent of the parties. No amendment shall be construed to release either party from any obligation of this Contract, or the Contract Documents except as specifically provided for in such amendment.

TECHNICAL SPECIFICATIONS

1. Contractor shall provide the services at its sole cost and expense, including the purchase of all equipment, materials, labor, services, insurance, utilities and similar costs that are required to perform the service requested.

2. Contractor shall be responsible to obtain and maintain all permits and approvals necessary for the performance of the service requested. The Contractor shall be fully responsible, without additional compensation whatsoever, to comply with any and all applicable laws, including, without limitation, local, state, and federal requirements. Such requirements shall include all environmental, OSHA, Department of Transportation regulations and any other provisions, which may apply to the “Transformer Purchases GU- 26-Q14” and its relevant data collection.

3. Contractor shall operate its facilities and equipment in accordance with the provisions of the Contract and good operating practices, in accordance with all local, state, and federal laws and regulations.

5. At any time during the term of operations, the Contractor shall reimburse City of Groton - Groton Utilities for any and all additional costs City of Groton - Groton Utilities incurs for the “Transformer Purchases GU-26-Q14” due to the inability or unwillingness of the Contractor to execute, as provided for in the Specifications.

6. Payments for services rendered to the Contractor shall be based upon Contractor’s submission of invoices received after delivery in such form and detail reasonably required by City of Groton - Groton Utilities. City of Groton - Groton Utilities shall have thirty days after receipt of invoices in approved form to make payment.

MATERIAL SPECIFICATIONS

SCOPE – This specification covers electrical characteristics and mechanical features of three-phase, 60 Hz, Envirotemp FR3TM fluid (or similar fluid) filled, self-cooled, pad-mounted type distribution transformers, rated 2500 KVA and smaller, high voltage 13800 volts and below, low voltage 480 volts and below.

GENERAL – The transformer shall meet all applicable requirements of IEEE C57.12.22-(Latest Revision), IEEE C57.12.26-(Latest Revision) and IEEE C57.12.28-(Latest Revision) except as otherwise specified herein.

RATINGS – Kilovolt-ampere ratings shall be 75, 150, 225, 300, 500, 750, 1000, 1500, 2000 and 2500. Voltage ratings and taps for specific sizes shall be in accordance with Table I of this specification.

CONSTRUCTION – All units with a wye connected primary shall have the primary neutral internally connected to the tank in back of the exterior tank ground pad in the primary compartment, but not connected to the secondary neutral. Provisions shall be made to allow opening of this connection for test. Such units shall be either four or five-legged core construction.

All units with a wye connected secondary shall have the secondary neutral brought out in the secondary compartment through a fully insulated bushing and equipped with a removable ground strap.

Minimum width of user connection cabinet shall be 54” on all units.

TANKS – Tank dimensions shall be such that no part of the tank and cable terminating compartment (not including cooling tubes or fins) will overhang the following pad size:

Transformer kVa Width Depth 75 - 300 76" 54" 500 - 2500 76" 70"

All units shall be equipped with a minimum of two (2) ground pads located in the lower portion of the compartments, one in the primary and one in the secondary. The grounds shall be constructed as specified in 7.6.4 of IEEE C57.12.26-(Latest Revision).

Manufacturers name, insignia or other designation shall not appear on the outside of the unit.

ACCESSORIES – Accessories to be included are those shown in the table below:

Transformer KVA Description 75-300 500-1500 2000-2500

Bayonet fuses with coordinated isolation links X X – Tap changer handle in HV compartment – X X Instruction nameplate inside LV compartment X X X 1 inch drain valve with built-in sampling device – X X 1 inch drain plug X X X 1 inch upper filter press and filling plug (or cap) X X X Lightning arresters X X X (only on units with porcelain bushings)

GROTON UTILITIES MATERIAL SPECIFICATION T-630 Pg 1 of 3 R 11

THREE PHASE PAD-MOUNTED TRANSFORMERS

ORIGINAL

8/77

APPROVED

7/2020

The drain plug or valve shall be located in the low voltage compartment.

Each low voltage bushing on transformers 225 kVA and smaller at 208 volts and 225 kVA and smaller at 480 volts shall have spade terminals with 9/16-inch holes at 1-3/4 inch centers extended and vertically braced to support 8-500 kcmil copper cables per spade.

Dual voltage transformers shall be equipped with an internal series-multiple switch. The operating handle for the switch shall be located in the high voltage compartment and shall have a positive position locking device.

Switch handle position identification shall be clearly stenciled on the tank. Where applicable, actual voltages shall be shown. Symbols with corresponding tables are not acceptable. The low voltage compartment shall be sized to accept 8-500 kcmil copper conductors per spade.

Each low voltage bushings on transformers 300 kVA and larger at 208 volts and 300 kVA and larger at 480 volts shall have spade terminals with 9/16-inch holes at 1-3/4 inch centers extended and vertically braced to support 16-500 kcmil copper cables per spade. Dual voltage transformers shall be equipped with an internal series-multiple switch. The operating handle for the switch shall be located in the high voltage compartment and shall have a positive position locking device. Switch handle position identification shall be clearly stenciled on the tank. Where applicable, actual voltages shall be shown. Symbols with corresponding tables are not acceptable. The low voltage compartment shall be sized to accept 16-500 kcmil copper conductors per spade.

Units 2500 kVA and below shall be specified as one of the following:

Live Front Radial Feed units shall have three (3) porcelain primary bushings sealed into the transformer tank by bolting to a gasketed bushing well. The bushings shall be equipped with an eyebolt connector to accept the primary cable termination. Units shall be equipped with one 12 KV MOV lightning arrester per primary bushing.

Dead Front Loop Feed - The high voltage terminals shall consist of six ABB, Elastimold, GE or Central Moloney replaceable stud clamped-in bushing wells of the proper kV and BIL ratings. High voltage bushing wells, low voltage terminals, parking stands and rigid barrier shall be as per IEEE C57.12.26-(Latest Revision), figures 6(a), 7 and 8(a) (staggered low voltage terminals). There shall be no less than 4-1/2 inches clearance from the extended center-line axis of all high voltage bushing wells to any part of the enclosure.

Bushing well inserts shall be provided and installed prior to shipping.

When manual voltage tap changing is required, a tap changing switch with an external handle in the primary compartment shall be provided.

Handhole(s) shall be provided to permit necessary access for the replacement of secondary bushings, primary bushing wells and isolation links. Handhole(s) shall have cover(s) with no nuts, bolts or clamps accessible when the compartment doors are closed and locked. Handhole cover(s) shall not be welded or tack welded closed.

Transformers thru 1500 KVA shall be equipped with Bayonet type fuses connected in series with the high voltage windings and shall be fitted with current sensing fuse elements and coordinated isolation links.

Where dual voltage units are specified, isolation links shall be coordinated with the lower voltage fuse element.

Bayonet fuse holders shall be equipped with a suitable drip guard to prevent insulating fluid from dripon .

GROTON UTILITIES MATERIAL SPECIFICATION T-630 Pg 2 of 3 R 11

8/77

Bayonet fuse holders shall be equipped with a suitable drip guard to prevent insulating fluid from dripping on molded rubber terminations and cables during fuse removal.

The fuses shall be removable using a hot stick (without disassembly of the primary cabinet) for external replacement of fuse cartridges.

Transformers over 1500 KVA shall be equipped with replaceable weak link fuses connected in series with the high voltage winding rated approximately 2.5 times the rated primary current. Dual voltage units shall have dual fusing. Compromise fusing is not acceptable.

Transformers shall be equipped with lifting lugs or a suitable means for lifting.

The transformer tank shall be equipped with a manual pressure relief device.

The transformer nameplate shall clearly indicate the connection diagram and the location, size and type of the protection devices. The nameplate shall clearly indicate the month and year of manufacture (i.e. January 2007), the total gallons of fluid contained in the unit and the transformer contains Envirotemp FR3TM fluid. All lettering shall be 5/32 inch minimum in height.

The transformer nameplate (separate mounted metal nameplate) shall clearly indicate that at the time of manufacture and shipment, the fluid in the transformer contained less than 1 ppm PCB (Polychlorinated Biphenyl) contamination.

FLUID – Fluid supplied with these transformers shall be Envirotemp FR3TM fluid (or equivalent).

Exceptions to the use of Envirotemp FR3TM fluid must be submitted in writing to the Manager of Engineering Electric for approval.

SHIPPING – All dual-voltage units shall be shipped connected and fused for the lower voltage.

TABLE I

HIGH VOLTAGE RATING

KVA FOR LOW

VOLTAGE RATING

LINE RATING BIL

TAPS

NOTE 1 208/120 480/277

13800∆

WO

WT

75-500 500-1000

75-500 500-2500

13800Y/7970 95

WO

WT

75-500 500-1000

75-500 500-2500

NOTE: 1. – TAPS – WO – None

WT – Two 2 ½ % above and below in all high voltage windings

GROTON UTILITIES MATERIAL SPECIFICATION T-630 Pg 3 of 3 R 11

8/77

13.8KV Distribution Level

TRANSFORMER PURCHASE EVALUATION

Groton Utilities (GU) normally purchases transformers on the basis of lowest first cost. This has traditionally been the case with the exception of a few of the larger power transformers.

It is well established that transformers can be designed for either lowest first cost or lowest cost over the life of the unit(s). Lowest first cost usually means higher per unit losses whereas lower per unit losses results in additional cost in the manufacturing process. Ideally, the actual lowest unit cost is a compromise between these two extremes.

Rapidly escalating energy cost, and in turn the cost of transformer losses, has caused GU to develop a method for evaluating these losses in order to arrive at the lowest cost over the life of the transformer(s).

Numerous methods have been described for making transformer loss evaluations, most of which take a different approach to the problem. The following is one such approach:

GENERAL EQUATION:

V = S + 8760EF

R

Where: V = $/KW loss evaluation.

S = $/KW of system investment to the primary terminal of the transformer being evaluation

E = $/KWHR average cost of energy (use the average of the most recent complete fiscal year, including the FFA).

R = Per Unit (%100) annual system carrying charges including taxes, insurance, depreciation and return of investment. (Use 8% of total plant recorded on the last day of the most recent fiscal year for return).

F = Ratio of the average to rated loss of both the load (FL) and no load (FN) loss. For

FL, use the square of the ratio of the average peak load of the portion of the system under consideration to the total connected transformation of the portion of the system under consideration. For continuous operation, use 1.0 for (FL).

Example calculation of loss factors: (Data taken from 1998 – 1999 period.)

Determine the loss factors for distribution line transformers purchased in fiscal 1998-1999.

S = Approximate plant to primary terminals of distribution line transformers as of 6/30/99 - $22,876,108. Peak 60-minute demand for fiscal 1998-1999 –

90,720 KW.

S = = 252.16/KW

E = Purchase power cost for fiscal 1998-1999 – $32,627,715. Purchase energy for fiscal 1998 – 1999 - 495,124,673 KWHR.

E = = .065898 KWHR

R = Data for fiscal 1998-1999 (for total system)

Insurance $ 74,009 Taxes & Assessments 1,231,000 Depreciation 1,261,088 8% Return 1,691,758 $ 4,257,855

R = $4,257,855 = .149797 28,424,219

Where: $28,424,219 is total plant as of June 30, 1999.

F – No load ratio (FN) = 1.0

Load ratio (FL) = Peak Load ² Connected Capacity

Average monthly distribution load – 38,510 KW Connected distribution KVA – 103,465

FL = ² = .138535

$22,876,108 90,720

$32,627,715 495,124,673

38,510 103,465

CALCULATION OF LOSS FACTORS:

VL = 252.16 + (8760) (.065898) (.138535) = $786.03/KW

.149797

VN = 252.16 + (8760) (.065898) (1.0) = $4,105.82/KW

.149797

EXAMPLE EVALUATION:

In this example, assume the following quotations were received:

Quotation Unit Cost No Load Load

A $ 646.00 190 456 B $ 666.00 177 424 C $ 686.00 160 384

The evaluation would be as follows:

Quotation A

$646.00 + (190) (4,105.82) + (456) (786.03) = $1,784.54/Unit (1000) (1000)

Quotation B

$666.00 + (177) (4,105.82) + (424) (786.03) = $1,726.01/Unit

Quotation C

$686.00 + (160) (4,105.82) + (384) (786.03) = $1,644.77/Unit

In this case, Manufacturer C submitted the lowest quotation over the life of the unit(s).

When requesting transformer quotations (bids), the manufacturers should be advised that the award will be based on an evaluation that includes the cost of losses. The manufacturers should also be giving the loss evaluation factors in $KW. When submitting a quotation (bid), a manufacturer must indicate what both the load and no load losses will be and guarantee they will not exceed the given values.

The actual transformer losses shall be determined by test. GU shall have the option of accepting the manufacturer’s test data for other units of similar manufacturer or may require a certified test. GU shall have the additional option of conducting its own test. If there are discrepancies between the GU’s and the manufacturer’s test data, the GU’s test data will govern the loss evaluation.

Distribution transformer purchases are initiated by Project Management and the Purchasing Agent solicits quotations. When such quotations are received, they will be referred to the Purchasing Agent for evaluation and award recommendation.

In the case of distribution transformers, it is normally unwarranted to require a certified test and, therefore, the evaluation and award should be based on the data submitted by the manufacturer.

In the case of power transformers, 3000 KVA and larger, a manufacturer’s certified test report is required. If such certified test reports indicate the losses exceed the guaranteed values, the price of the transformer will be adjusted accordingly. Manufacturers will be advised of this potential adjustment when the Department solicits quotations.

Power transformers are usually evaluated through a formal quotation process. In this case, the Department’s Engineering Aide will prepare the quotation documents and make an award recommendation based on the quotation received.

MANDATORY PROPOSAL FORM

FORM 1

CERTIFICATIONS

Certification of Independent Price Determination

The undersigned deponent, of lawful age, being duly sworn, upon his oath deposes and says: that they have lawful authority to execute the within and foregoing proposal; that they have executed the same by subscribing their name hereto under oath for and on behalf of said respondent; that respondent has not directly or indirectly entered into any agreement, expressed or implied, with any respondent or respondents, having for its object the controlling of the price or amount of such proposal or proposals, the limiting of the proposals or respondents, the parceling or farming out to any respondent or respondents or other persons of any part of the Contract or any part of the subject matter of the proposal or proposals or of the profits thereof, and that he has not and will not divulge the sealed proposal to any person whomsoever, except those having a partnership or other financial interest with him in said proposal or proposals, until after the said sealed proposal or proposals are opened.

Deponent further states that the respondent has not been a party to any collusion among respondents in restraint of freedom of competition by agreement to make a Proposal at a fixed price or to refrain from submitting a proposal; or with any state official or employee as to quantity, quality, or price in the prospective contract, or any other terms of said prospective contract, or in any discussions between respondents and any City official concerning exchange of money or other things of value for special consideration in the letting of a contract; that the respondent/contractor has not paid, given or donated or agreed to pay, give or donate to any official, officer or employee of City of Groton - Groton Utilities any money or other thing of value either directly or indirectly.

Acceptance Period The respondent agrees that it will allow sixty (60) days from the date of this proposal for acceptance thereof by City of Groton - Groton Utilities.

Equal Employment Opportunity

The undersigned represents and warrants that its employees and applicants for employment and those of any labor organization, sub-contractors, or employment agency in either furnishing or referring employee applicants to the undersigned have not and will not discriminate in employment practices, and that respondent will at all times relevant hereto conform to the prohibitions against employment discrimination stated in the General Statutes of the State of Connecticut and other laws applicable to it . City of Groton - Groton Utilities does not discriminate against individuals with disabilities as provided in the Americans with Disabilities Act (ADA). City of Groton - Groton Utilities expects that the vendors and/or contractors with which they do business will comply with the Americans with Disabilities Act to the extent required by law. If awarded a contract with City of Groton - Groton Utilities, the successful Contractor will be required to sign a statement agreeing to comply with the provisions of ADA.

Certification Regarding Delinquent Taxes or Fees

The respondent certifies that neither it, nor any business entity or corporation fully or partially owned by the respondent, is delinquent on any property tax or fee owed to the City of Groton.

Representations and Warranties

The Contractor hereby represents and warrants to and for the benefit of City of Groton - Groton Utilities:

(a) If not a sole proprietorship, the Contractor is duly organized and validly existing under the laws of the State of , with full legal right, power and authority to enter into and perform its obligations under this Contract, and is duly qualified to do business and is in good standing in each jurisdiction in which the transaction of its business pursuant to this Contract makes such qualification necessary, including, but not limited to, the State of Connecticut.

(b) The Contractor has duly authorized the execution and delivery of this

Contract and this Contract has been duly executed and delivered by the Contractor and constitutes a legal, valid and binding obligation of the Contractor, enforceable against the Contractor in accordance with its terms.

(c) Neither the execution or delivery by the Contractor of this Contract, nor the performance by the Contractor of its obligations in connection with the transactions contemplated hereby, or the fulfillment by the Contractor of the terms or conditions hereof (i) conflicts with, violates or results in a breach of any applicable law or (ii) conflicts with, violates or results in a breach of any term or condition of any judgment or decree, or any agreement or instrument, to which the Contractor is a party or by which the Contractor or any of its properties or assets are bound, or constitutes a default thereunder.

(d) No approval, authorization, order or consent of, or declaration, registration or filing with, any governmental authority is required for the valid execution and delivery of this Contract by the Contractor, except such as have been duly obtained or made.

(e) There is no action, suit or proceeding, at law or in equity, before or by any court or governmental authority, pending or, to the best of the Contractor’s knowledge, threatened, against the Contractor or any Contractor Principals wherein an unfavorable decision, ruling or finding would materially adversely affect the performance by the Contractor of its obligations hereunder or in connection with the transactions contemplated hereby, or which, in any way, would adversely affect the validity or enforceability of the Contract. For purposes of this Section, Contractor Principals shall mean any of Contractor’s partners, joint venturers, members, stockholders holding at least 10% of the outstanding shares of Contractor’s stock, or Contractor’s present officers or past officers serving within the previous three (3) years.

(f) Contractor is fully experienced, properly qualified, is properly financed and has all permits, licenses or other approvals necessary to enable it to perform fully its obligations under this Contract.

(g) Contractor, its officers, agents, employees, contractors and approved subcontractors, shall abide by and comply with all statutes, laws, ordinances, rules and regulations (including, without limitation, those protecting public health and the environment) enacted or adopted or promulgated by federal, state and local governmental authorities, and agencies thereof, and any decision or order of any court or governmental authority, or agency thereof.

Respectfully Submitted:

(SEAL)

Firm Name (If by a corporation)

By:

Signature

Typed Name and Title

Business Address

Telephone Fax Email

MANDATORY PROPOSAL FORM

FORM 2

Transformer Quotation Form

TRANSFORMER QUOTATION FORM

May 8, 2026 “Transformer Purchases GU-26-Q14”

City of Groton/Groton Utilities reserves the right to award based on individual transformer line item pricing.

Quantities are as specified in RFP section 1.2 Quotes under “Information for Respondents”.

Losses Delivery Unit Item Size Manufacturer No Load/Load/Full Load Time Price

Padmount

1 150 kVA ___________________ __________________ ________ _______ (120/208Y 3Ø)

2 225 kVA ___________________ __________________ ________ _______

3 750 kVA ___________________ __________________ ________ _______

Company Name Signature

Address Print or Type Name

Date

EXHIBIT I

CITY OF GROTON - GROTON UTILITIES CONTRACT

Transformer Purchases GU-26-Q14

This Contract is entered into this ___ day of MONTH, 2026, between the GROTON UTILTIES, GROTON, CONNECTICUT, and of , , hereinafter called the CONTRACTOR, whereby the CONTRACTOR agrees to complete the work on the project entitled “Transformer Purchases GU- 26-Q14” in accordance with the Contract Documents which consist of the Instructions to Respondents, the Proposal, General Conditions, and Technical Specifications, and which are hereby made part of this Contract. The CONTRACTOR agrees to carry on the work with diligence and dispatch, and to furnish such equipment as is consistent with good practice.

City of Groton - Groton Utilities agrees to pay the CONTRACTOR as specified in Paragraph 6 of the Technical Specifications.

This Contract shall commence on today’s date of contract Execution and carry through project completion, in accordance with the terms included in the General Conditions.

Signed at Groton, Connecticut this ___ day of __________, 2026.

FOR CONTRACTOR FOR GROTON UTILTIES

RONALD GAUDET

Director of Utilities

Address for giving notice: Address for giving notice:

295 Meridian St Groton, CT 06340