19GE5026Q0099-0001_QnA (2).pdf

Electrical Upgrades, Renovations and Solicitation no. 19GE5026Q0099

Repairs at EPHI Compound Amendment 0001 dated August 20, 2026

Ethiopian Public Health Institute (EPHI)

Addis Ababa, Ethiopia

QUESTIONS & ANSWERS (Q&A)

Supplemental files associated with Amendment 0001 are available on FAN.gov

CONTRACTUAL QUESTIONS

Question 1 - Two-phase advisory down-select process

Combined Synopsis, paragraph (iii); Attachment 4, L.5.4 and L.8

The Combined Synopsis states that this acquisition uses a two-phase advisory down-select process with a Phase One submission of concise technical information and a Rough Order of Magnitude (ROM) price. Attachment 4 contains no Phase One instructions, and L.8 establishes a single due date for complete Volume 1 and Volume 2 quotations.

(a) Please confirm whether a single complete submission is required by 16:00 CEST on

2 September 2026.

(b) If the two-phase process remains applicable, please issue an amendment stating the

Phase One content requirements, the ROM price format, the Phase One due date, the date of Government's advisory notification, and the Phase Two due date.

Answer 1 - Two-phase advisory down-select process:

(a) Confirmed. This solicitation does not employ a two-phase advisory down-select process. Paragraph (iii) of the Combined Synopsis/Solicitation states only that "Quoters shall submit one complete quotation in response to this solicitation, consisting of two physically separate volumes: Volume 1 - Price Quotation and Volume 2 - Technical

Quotation," which the Government will evaluate through "a comparative best-value evaluation of complete quotations." There is no reference in paragraph (iii), or elsewhere in the solicitation as issued, to a Phase One concise technical/ROM price submission, an advisory down-select, or a Phase Two submission. Section L.5.4 confirms the same single, two-volume submission structure (Volume 1 - Price

Quotation; Volume 2 - Technical Quotation), and Section L.8 establishes one quotation submission at 16:00 hours Central European Summer Time (CEST) on September 2, 2026 for both volumes (Volume 1 and Volume 2).

(b) No two-phase process is contemplated by this solicitation, and none will be implemented. The single-submission, comparative best-value evaluation process set forth in the Combined Synopsis, paragraph (iii), and Sections L.5.4, L.8, and M remain unchanged. Quoters shall submit one complete quotation, consisting of Volume 1

(Price Quotation) and Volume 2 (Technical Quotation), no later than 16:00 hours

Central European Summer Time (CEST) on September 2, 2026.

Question 2. Quality Management Program reference and sample Quality

Assurance Report

Attachment 2, E.5.17; Attachment 4, L.5.4 and L.5.5.3.5

Subsection L.5.5.3.5 requires the Preliminary Quality Management Program to be provided in accordance with subsection E.5.1.5.1, which we are unable to locate in

Attachment 2.

(a) Please identify the correct subsection reference.

(b) Subsection E.5.17 requires a sample Quality Assurance Report as part of the solicitation package, but this is not listed among the Volume 2, Tab E requirements at

L.5.4. Please confirm whether a sample Quality Assurance Report is required with the quotation under Tab E.

Answer 2 - Quality Management Program reference and sample Quality Assurance

Report:

(a) The reference to "subsection E.5.1.5.1" in Section L.5.5.3.5(E) is a typographical error.

The correct reference is Section E.5.8, Organizational Structure. Please refer to the amended documents 19GE5026Q0099-0001 - Attachment 2_Sections B thru J correcting the reference in Section E.5.8 and amended document 19GE5026Q099-

0001 – Attachment 4_Sections L through M correcting the reference in Section

L.5.5.3.5(E).

(b) Yes. A separate sample Quality Assurance (QA) Report is required as part of the quotation submission under Volume 2, Tab E. The sample QA Report is separate from the Preliminary Quality Management Program (QMP) required under Section

L.5.5.3.5(E), Preliminary Quality Management Program. The sample QA Report shall demonstrate the Quoter's understanding and proposed approach to the QMP reporting requirements described in Section E.5.17.

The solicitation is amended to clarify Section L.5.5.3.5(E) submission requirements.

Please refer to the amended document 19GE5026Q0099-0001 – Attachment

4_Sections L through M.

Question 3. NCAGE code at quotation closing:

Attachment 3, K.1(d); Attachment 4, L.5.5.2(G)

(a) Subsection L.5.5.2 (G) requires proof of an active NCAGE code with the submission but also provides that a quoter not currently possessing a code shall initiate registration prior to award. Please confirm whether evidence of a submitted NCAGE application is acceptable at quotation closing, with the active code required before award, or whether an active code is mandatory at closing.

Answer 3 - NCAGE code at quotation closing:

(a) Subsection L.5.5.2 (G) is amended to clarify the NCAGE code requirement. Please refer to amended document “19GE5026Q0099-0001 – Attachment 4_Sections L through M” for the revised language. In accordance with the amended provision, a

Quoter that does not currently possess an NCAGE code may submit evidence of an initiated NCAGE registration with its quotation and shall obtain an active NCAGE code prior to award.

Question 4. Section K.9 — reference to the Federated States of Micronesia

Attachment 3, K.9

(a) Section K.9 requires the quoter to certify that it is authorized to operate and is in compliance with the laws of the Federated States of Micronesia. Please correct this reference by amendment to the Federal Democratic Republic of Ethiopia, and confirm that the corrected certification is to be executed with the quotation.

Answer 4 - Section K.9 — reference to the Federated States of Micronesia:

(a) Section K.9 reference to "the Federated States of Micronesia" is a drafting error.

Please refer to the amended document “19GE5026Q0099-0001 - Attachment 3_Section

K”

Question 5. Acceptability of the institution issuing the required securities

Attachment 2, H.1.1; Attachment 4, L.5.3.1 and L.5.5.2(H)

(a) Please confirm whether Irrevocable Letters of Credit issued by a commercial bank licensed by the National Bank of Ethiopia, using the forms prescribed in Section J, are acceptable to the Government.

(b) Please confirm whether any confirmation, correspondent-bank, geographic location or credit-rating requirements apply to the issuing institution, so that the quotation-stage bank evidence can be arranged on the correct basis.

(c) Under FAR 28.204-3(g) and FAR 52.228-14(d)(1), an ILC is required to be issued or confirmed by a federally insured financial institution rated investment grade. Ethiopian commercial banks, acting independently, may not meet these requirements. If a Quoter is unable to obtain an ILC issued or confirmed in accordance with FAR 28.204-3(g), will the Government accept another permissible form of security under FAR Part 28?

(d) Will the Government accept the required performance and payment securities issued by an NBE-licensed Ethiopian commercial bank in Ethiopian Birr (ETB), calculated at the equivalent security value?

Answer 5 - Acceptability of the institution issuing the required securities:

(a) The Government cannot confirm that an ILCs issued solely by an Ethiopian commercial bank will be acceptable unless the issuing/confirming institution and the

ILC otherwise satisfy the requirements of Section H.1 of the solicitation and applicable

FAR provisions/clauses.

(b) The quotation-stage letter from the financial institution is required only to confirm that, in the event of award, the institution will provide the securities required under Section

H.1.1, totaling 40% of the Purchase Order amount. As stated in Section L.5.3.1, the letter serves solely as evidence of the Quoter’s ability to obtain the required ILCs or bonds, as applicable, and does not constitute the required performance or payment security. The actual ILCs or bonds provided after award must comply with the requirements of Section H.1 and the applicable FAR provisions/clauses. The actual

ILCs will be subject to review and approval by the Contracting Officer. Accordingly, the Quoter should ensure that the financial institution identified in its quotation-stage letter is able, in the event of award, to provide security that meets the requirements of

Section H.1.1.

(c) If the Quoter is unable to satisfy the requirements for an ILC issued or confirmed in accordance with FAR 28.204-3(g), the Quoter may consider other acceptable forms of security provided under FAR 28.204-2, or similar form of security that meets the requirements of FAR Part 28, as applicable.

(d) The required performance and payment securities shall be denominated in the same currency as the Quoter’s quotation. There is no requirement that the performance or payment security be denominated in U.S. dollars. Accordingly, if the Quoter submits its quotation in Ethiopian Birr (ETB), the required performance and payment securities may be provided in ETB.

Question 6. Progress payment for materials delivered but not installed

Attachment 2, G.4.2(a); Section I, FAR 52.232-5

Subsection G.4.2(a) provides for payment for labor and materials completed and in place, while FAR 52.232-5 addresses materials delivered to the site.

(a) Please confirm whether approved equipment and materials delivered to and securely stored at the project site, but not yet installed, are eligible for progress payment.

(b) If so, please identify the evidence the Government will require in support, including as to title, insurance, inspection, segregation and storage conditions.

Answer 6 - Progress payment for materials delivered but not installed:

(a) In accordance with Section G.4.2(a), progress payment requests shall cover the value of labor and materials completed and in place. Accordingly, materials and equipment delivered to and securely stored at the project site, but not yet installed or incorporated into the work, are not eligible for progress payment unless specifically authorized by the Contracting Officer in accordance with FAR 52.232-5.

(b) Any consideration of materials or equipment delivered to and stored at the project site for purposes of a progress payment is subject to the prior authorization of the

Contracting Officer and the requirements of FAR 52.232-5. The Contractor shall provide such supporting documentation and evidence as may be required by the

Contracting Officer to establish compliance with the contract requirements, including evidence of title, where applicable, and satisfactory conditions for identification, inspection, protection, and storage of the materials or equipment.

Question 7. Defense Base Act insurance and CLIN 0005

Attachment 2, B.7.1 to B.7.4; CLIN 0005

We are presently in the market for a tender-stage quotation for Defense Base Act coverage and are unable to close that price without the following confirmations.

(a) Please confirm whether the Government has designated a specific carrier, broker or

Defense Base Act insurance program through which coverage must be obtained, or whether the Contractor may place coverage with any carrier authorized by the U.S.

Department of Labor.

(b) Defense Base Act policies are commonly subject to payroll audit at expiry, and the carrier's minimum premium may exceed the rated premium. Please confirm whether

CLIN 0005 will be adjusted to the audited premium, or whether any amount above the figure quoted is absorbed within the firm-fixed price under clause B.7.3.

(c) Please confirm that the premium in respect of subcontractor employees at all tiers, as required by B.7.4, is to be carried within CLIN 0005 by the prime Contractor.

(d) Please confirm whether the U.S. Department of Labor has granted a waiver under section 1(a)(6) of the Defense Base Act in respect of Local Country Nationals, or Third

Country Nationals, engaged on Department of State contracts performed in Ethiopia.

If such a waiver is in effect, please provide a copy or identify it, as the waiver materially affects the remuneration base on which the insurance is rated and therefore the amount quoted at CLIN 0005.

Answer 7 - Defense Base Act insurance and CLIN 0005:

(a) The Government has not designated a specific carrier, broker, or DBA insurance program. Section B.7.2 states: "DBA Insurance may be obtained from any U.S.

Department of Labor (DOL) authorized DBA insurance broker. A list of DOL approved insurance brokers is available at http://www.dol.gov/owcp/dlhwc/lscarrier.htm. The Contractor may therefore place coverage with any carrier/broker authorized by the DOL; no single designated carrier is mandated.

As courtesy information only, and without endorsement or recommendation by the

Government, prospective quoters may wish to contact the following as one potential source for DBA insurance:

K2 Oconus Insurance Services, LLC

Kevin Pedone, Chief Growth Officer: kpedone@k2oconus.com

Quoters remain free to obtain DBA coverage from any DOL-authorized broker or carrier of their choosing; identification of this contact does not constitute a

Government preference, requirement, or endorsement.

(b) CLIN 0005 will not be adjusted based on the final audited premium, actual payroll, or any carrier minimum premium that exceeds the amount quoted by the Quoter. As stated http://www.dol.gov/owcp/dlhwc/lscarrier.htm mailto:kpedone@k2oconus.com in Section B.7.3, DBA insurance is included in the total evaluated firm-fixed price, and the Contractor will be reimbursed only to the extent the Contractor provides documentary proof that the DBA insurance has been paid and only to the extent quoted in CLIN 0005. Accordingly, any DBA insurance cost exceeding the amount quoted in

CLIN 0005 shall be the Contractor's responsibility and shall be absorbed within the firm-fixed price.

(c) Yes. The Quoter shall include in CLIN 0005 all DBA insurance costs associated with employees of subcontractors at all tiers that are required to maintain DBA coverage under Section B.7.4. The Contractor shall be responsible for ensuring that all subcontractors maintain the required DBA coverage and for maintaining documentation of such coverage. Reimbursement by the Government shall be limited to the amount quoted in CLIN 0005 and subject to the requirements of Section B.7.3.

(d) No. Ethiopia is currently not listed on the U.S. Department of Labor's Active DBA

Waiver List. Accordingly, no DBA waiver under Section 1(a)(6) is applicable to this solicitation for Host Country Nationals (HCNs) or Third Country Nationals (TCNs).

DBA insurance is therefore required for all employees and workers performing under this purchase order, including U.S. citizens, individuals hired in the United States, HCNs, and TCNs. Quoters shall include the applicable DBA insurance costs for all covered employees and workers in CLIN 0005.

TECHNICAL QUESTIONS

Question 8. Transformer or compact substation — option and scope of supply

J.2.1, IV.4(b); J.2.2, pages 20 and 27; J.2.4, 1.2.1; J.2.5 (no Section 262200); J.2.6, drawing 07-EX-006; J.2.8, item 262200.01

The Statement of Work, Bill of Quantities and power riser diagram require a new 800 kVA compact substation, while the assessment and design reports also identify use of the existing idle 1,250 kVA transformer as an alternative. No Section 262200 is included in the technical specification.

(a) Please confirm which option is to be priced.

(b) For the option selected, please provide the transformer or compact substation technical schedule, and define the division of responsibility between the Contractor and the

Ethiopian Electric Utility for the 15 kV connection, medium-voltage cable or overhead termination, ring main unit or HV switchgear, metering, protection, foundation and civil works, earthing, testing and utility approval.

Answer 8 - Transformer or compact substation — option and scope of supply

(a) Price the new 800 kVA compact substation as the base bid, in accordance with the amended electrical design, BOQ, and Drawing 07-EX-006 (new Section 262200). The

800 kVA unit is intended to serve the CDC office and the adjacent buildings included in the project distribution system. The existing idle 1,250 kVA transformer is not part of the base bid and is identified only as an alternative in the assessment/design reports.

Any decision to reuse the 1,250 kVA transformer would require separate written

Government direction.

(b) The Contractor shall provide and install the complete 800 kVA compact substation, including associated foundations/civil works, earthing, cabling, protection, testing, commissioning, and all required coordination and submittals for EEU approval. The minimum transformer requirements are 800 kVA, 15/0.38 kV, 50 Hz, Dyn11, with ±2

× 2.5% taps.

EEU shall be responsible for, or approving, the utility-owned 15 kV connection, utility metering, switching/energization, and any work required by EEU regulations to remain under utility control. The Contractor shall be responsible for all project-side work from the agreed utility demarcation point onward.

The exact MV termination, RMU/HV switchgear, metering, protection, and utility connection requirements shall be coordinated with EPHI and approved by EEU before procurement and installation. The SOW requires transformer data sheets and final commissioning to be subject to EEU approval.

Question 9. Generators — operating philosophy and synchronization

J.2.2, pages 19 and 27; J.2.4, 1.2.7; J.2.5 (no Section 263213); J.2.6, drawing 07-EX- 006; J.2.8, item 263213.02

The design report describes operating the two generating sets at alternating times, while the Bill of Quantities and riser diagram require synchronization through an 800 A panel.

At 380 V the stated maximum demand of 567.49 kVA corresponds to approximately 862

A, and the combined 775 kVA generator capacity to approximately 1,177 A.

(a) Please confirm the intended operating philosophy, that is whether parallel load sharing or duty/standby operation is required.

(b) Please confirm the repair scope required for each existing generating set, the modifications required to their controllers and to the existing automatic transfer arrangement, and the load-shedding sequence to be implemented.

(c) Please confirm the correct current rating and short-circuit rating of the synchronizer bus and its protection.

(d) Please provide the nameplate data and controller model and specifications for both existing generating sets.

Answer 9 - Generators — operating philosophy and synchronization

(a)The intended operating philosophy is parallel load sharing through the new synchronization panel. The existing 500 kVA and 275 kVA Cummins generators shall be synchronized and operated so that generator capacity is matched to the connected load. Under low-load conditions, the 275 kVA generator may operate independently;

as demand increases, the 500 kVA generator shall be brought online, and the two sets shall operate in parallel with automatic load sharing. The final start/stop thresholds, load-sharing sequence, protections, and controls shall be established in the Contractor’s approved synchronization shop drawings and commissioning plan.

(b) The 500 kVA generator is currently operational, while the 275 kVA generator is out of service due to maintenance issues and, or lack of spare parts. The exact condition and required repair scope for the 275 kVA unit shall be confirmed through on-site inspection and testing by the Contractor. The Contractor shall inspect and test both

Cummins generator sets, complete the necessary repairs to the 275 kVA unit, verify the condition of the new 500 kVA unit, and modify or upgrade the generator controllers as required for synchronization and parallel load sharing. Both generators shall be integrated with the new 1250 A, 3-pole ATS and synchronization panel specified in the drawings and BOQ. The Contractor shall also develop and submit the final operating sequence, synchronization logic, ATS interface, and load-shedding sequence for approval as deliverable submittal.

(c) The generator feeder ratings shown on the riser diagram—approximately 800 A for the 500 kVA generator and 500 A for the 275 kVA generator—are acceptable for the individual generator connections. However, the 800 A synchronization-panel bus rating is insufficient for the combined generator capacity and shall be revised to not less than 1,250 A. The synchronizer bus and its incoming/outgoing protective devices shall be sized for the combined generator load and coordinated with the new

1,250 A, 3-pole ATS. The final short-circuit withstand/interrupting rating shall be based on the approved short-circuit and coordination study and shall not be less than the calculated available fault current at the synchronization bus.

(d) The available information identifies both existing units as Cummins generators:

• 500 kVA generator: Cummins silent-type diesel generator, 3-phase, 400 V, 50

Hz, 500 kVA prime / 550 kVA standby, engine model QSZ13-G2, alternator

WP354D, with built-in ATS and approximately 1,200 L fuel tank.

• 275 kVA generator: Existing Cummins generator, identified in the available equipment information as C330/C300SD5.

• The complete nameplate data, engine/alternator details, and controller model/specifications shall be confirmed from the unit on site.

The Contractor shall field-verify and submit the complete nameplate and controller data for both generators, including model and serial numbers, rated kVA/kW, voltage, current, frequency, power factor, engine and alternator models, controller manufacturer/model, governor/AVR details, and communication capability, before finalizing the synchronization-system design.

Question 10. Recommendation — replacement of the 275 kVA generating set

J.2.2, page 19; J.2.4, 1.2.7; J.2.6, drawing 07-EX-006; J.2.8, item 263213.02;

Attachment 4, L.5.5.2(C)

Universal Construction PLC has inspected the existing 275 kVA generating set. We confirm that the set is not in working condition, that its control unit is not a Cummins-compatible controller but a generic unit, and that it does not natively support the isochronous load sharing required for parallel operation. Synchronization therefore cannot be achieved by the addition of a synchronizing panel alone. Following consultation with the engineers of Cummins-authorized suppliers, we recommend that the Government consider replacing the set in its entirety with a new, genuine Cummins 500 kVA set matched to the existing 500 kVA unit, providing a manufacturer-supported paralleling scheme, full redundancy at the stated maximum demand, and a materially longer service life for a facility requiring uninterrupted supply.

(a) Please advise whether the Government wishes this option to be considered.

(b) We intend to price the base scope exactly as issued so that our quotation remains fully responsive and, unless the Government directs otherwise, to carry the replacement as a clearly and separately identified priced option forming no part of our base price. Please confirm that a separately identified option of this kind is acceptable and will not prejudice the evaluation of our base quotation and advise whether it should be placed as an annex to the Price Quotation or as a separate line beneath the CLIN schedule.

(c) If the existing set is replaced, please confirm the disposal or hand back arrangement for the set removed, and whether any residual value is to be credited to the Government.

Answer 10 - Recommendation — replacement of the 275 kVA generating set

(a) Continue in accordance with the issued Scope of Work. The base requirement is to retain the existing 500 kVA and 275 kVA generators, correct the identified deficiencies, and provide the required synchronization arrangement. Replacement of the 275 kVA generator is not part of the base scope unless formally directed by the

Contracting Officer/RPSO.

(b) The quotation shall be based on the issued Scope of Work and BOQ. The proposed replacement of the 275 kVA generator shall not be included in the base price unless specifically requested by the Contracting Officer/RPSO. Any separately priced alternative may be considered only if authorized by the solicitation instructions or subsequently requested by the Government.

(c) If replacement is later authorized, the removed 275 kVA generator shall remain

Government property and be handed over to the designated CDC-Ethiopia representative in accordance with the project handover requirements. The Contractor shall not dispose of the generator or apply any residual/salvage value credit unless specifically directed in writing by the Government.

Question 11. System voltage, altitude and derating basis

J.2.4, 1.2.3; J.2.5, Sections 262416 (1.6), 265119 and 265219; J.2.6, drawings 07-EX- 003, 005 and 006

The technical documents variously use 380/220 V, 400/220 V, 400/230 V, 220 V and 240

V. Section 262416 states an altitude assumption not exceeding 750 meters, whereas the

EPHI compound is at approximately 2,355 meters above sea level.

(a) Please confirm the governing nominal low-voltage system voltage and frequency, together with the allowable input and output voltage ranges.

(b) Please confirm the design altitude and ambient conditions to be applied, and confirm that all transformers, stabilizers, transfer switch, synchronizer, generator, cable and panel ratings are to be stated after the required altitude and temperature derating.

Answer 11 - System voltage, altitude and derating basis

(a) The governing nominal low-voltage system voltage shall be 380/220 V, 3-phase, 4-wire, 50 Hz. References to other utilization voltages shall be coordinated with this system voltage. The altitude stated in Section 262416 as 750 m is a typographical error and has been corrected to the project site altitude of approximately 2,530 m above sea level. Refer to the amended J.2.5, Section 262416 for the revised project altitude and require applicable equipment derating.

(b) The electrical design and equipment selection is based on a site altitude of approximately 2,530 m above sea level. All transformers, stabilizers, ATS, synchronization equipment, generators, cables, breakers, and panelboards shall be suitable for the actual site altitude and ambient conditions and shall be derated as required by the respective equipment manufacturers. The final submitted equipment ratings shall reflect the applicable altitude and temperature derating.

Question 12. Short-circuit withstand and protection coordination

J.2.4, SKM Fault Analysis Summary; J.2.5, Sections 262416 (2.1) and 263600 (2.1);

J.2.6, drawing 07-EX-005; J.2.8, transfer switch and stabilizer items

The SKM analysis gives an available three-phase fault current of 62.827 kA at B. CMDB.

Drawing 07-EX-005 assigns the CMDB an AIC rating of 36 kA, and the Bill of Quantities specifies a 35-kA short-time withstand rating for the automatic transfer switch and 25 kA moulded case circuit breakers in the stabilizer bypass.

(a) Please issue the final short-circuit and protection coordination basis, together with the minimum SCCR, AIC, Icw, Icu and Ics ratings required for the transformer low-voltage assembly, stabilizer and bypass, transfer switch, synchronizer, CMDB and associated breakers.

(b) Please confirm whether the low-voltage assemblies are to be fully rated or series rated for the confirmed fault level.

(c) The riser diagram shows the CMDB with a 1,250 A busbar and a 1,600 A main device, and the MDB with an 800 A busbar and a 1,000 A main device. Please confirm the intended busbar and main device ratings for each board, and the basis on which the busbar is protected.

Answer 12 - Short-circuit withstand and protection coordination

(a) The short-circuit and protection-coordination requirements will be updated and issued by amendment, including the required SCCR, AIC, Icw, Icu, and Ics ratings for the affected equipment. CMDB AIC rating is 50 kA and the AVS also with 50 kA. It is amended on the riser diagram and BOQ.

(b) The low-voltage assemblies shall be based on a series-rated assembly/system. The final series-rated combinations shall be coordinated and supported by the applicable manufacturer’s tested/listed data and the approved protection-coordination study.

(c) No, the ratings per the drawing are the reverse of those stated in the question. The

CMDB shall have a 1,600 A busbar with a 1,250 A main breaker, and the MDB shall have a 1,000 A busbar with an 800 A main breaker. The busbar rating per the standard practice shall be equal to or greater than the continuous current rating of the associated main protective device.

Question 13. Earthing system, neutral topology and transfer switch configuration

J.2.4, 1.2.3 and 1.2.4; J.2.5, Sections 260526 and 263600 (2.1); J.2.6, drawing 07-EX- 006; J.2.1, III(j) to (l)

The design adopts a TN-S system, while the riser diagram and Bill of Quantities identify a

1,250 A three-pole automatic transfer switch and Section 263600 requires a fully rated neutral terminal.

(a) Please confirm whether the transfer switch is to be three-pole with a solid neutral or four-pole with a switched neutral.

(b) Please identify the neutral-to-earth bonding point or points at the transformer and at each generating set, define the separately derived system and ground fault protection arrangement, and issue a coordinated one-line diagram showing the complete neutral and protective earth topology.

(c) Please confirm whether open-transition or closed-transition switching is required, having regard to the life-safety and laboratory loads served and to the requirement that the facility remain in operation throughout the works.

Answer 13 - Earthing system, neutral topology and transfer switch configuration

(a) The transfer switch shall be 3-pole with a solid, unswitched, half rated neutral. Refer

BOQ identifies a 1,250 A, 3-pole ATS, and Section 263600.

(b) The distribution system shall remain TN-S, as indicated on the riser diagram Refer

Drawing 07-EX-006, Power Riser Diagram and Electrical Design Report, Sections

1.2.3 and 1.2.4. The neutral-to-earth bonding and protective-earth arrangement shall be coordinated at the transformer and generator sources in accordance with the grounding specification Section 260526. The Contractor shall show the complete neutral, PE, grounding-electrode, and bonding arrangement on the final coordinated one-line/shop drawing for approval.

(c) A temporary outage will be required when the new transformer and CMDB are placed in service and the facility load is transferred to the new system. The outage and transfer sequence shall be coordinated in advance with the laboratory/facility management team EPHI and CDC to maintain critical operations. Refer the specification and SOW. The transfer arrangement shall be open transition (break-before-make).

Question 14. Voltage stabilizer — rating, bypass arrangement and performance

J.2.3, ORTEA catalogue cut sheet; J.2.4, 1.2.2; J.2.6, drawing 07-EX-006; J.2.8, stabilizer item

The catalogue cut sheet provided describes a 400 kVA stabilizer, while the design report, riser diagram and Bill of Quantities require 800 kVA. For an 800 kVA stabilizer at 380 to

400 V, full-load current is approximately 1,155 to 1,215 A, yet the bypass description refers to three interlocked 300 A switches together with an 800 A and a 1,250 A moulded case circuit breaker.

(a) Please confirm the stabilizer technology, model and rating required, stated after the applicable derating.

(b) Please issue a corrected bypass and interlock single-line diagram in which every current-carrying and protective device is rated for full load and for confirmed fault level.

(c) Please confirm the stabilizer performance requirements, including input voltage tolerance, output accuracy, phase-sequence correction, overload capability, monitoring and any remote interface required.

Answer 14 - Voltage stabilizer — rating, bypass arrangement and performance

(a) The required voltage stabilizer capacity is 800 kVA. The catalogue cut sheet covers a range of available capacities, including the required rating. The Contractor shall select and submit an 800 kVA stabilizer, suitable for the project voltage, altitude, and operating conditions, for approval during the equipment submittal process.

(b) The stabilizer bypass arrangement shall use a 1,250 A bypass ACB. The conflicting breaker ratings shown in the current BOQ/riser diagram have been corrected.

Amended BOQ and Drawing 07-EX-006 are reflecting the corrections. The Contractor shall submit the manufacturer’s detailed bypass/interlock single-line diagram, including all protective and isolation devices, for approval.

(c) The stabilizer performance requirements shall be in accordance with BOQ Item

262816.01 for the 800 kVA voltage stabilizer. The Contractor shall comply with the specified input-voltage tolerance, output regulation, phase correction/protection, overload capability, monitoring, and remote-status requirements and submit the manufacturer’s data demonstrating compliance.

Question 15. Feeder cables — construction, sizes and sources

J.2.2, page 25; J.2.4, 1.2.3; J.2.5, Section 260519; J.2.6, drawings 07-EX-003, 005, 006 and 008; J.2.8, items 260519.01 to .08

The feeder documents do not reconcile with one another.

(a) The technical specification and Bills of Quantities call for NYY PVC-insulated cables, while the cable schedule on the riser diagram calls for XLPE insulated, steel wire armoured, low smoke zero halogen cables. Please confirm the required cable construction.

(b) The feeder to the second-floor UPS board is given as 5 x 16 mm² in the Bill of

Quantities and as 3 x 25/16 + 1 x 16 mm² on drawing 07-EX-003. Please confirm the correct size.

(c) Sub-distribution board SDB-2F is shown as fed from SDB-G1 in the Bill of Quantities and from SDB-2NEW on drawing 07-EX-003. Please confirm the correct source board.

(d) The pump feeder is given as 5 x 6 mm² in the Bill of Quantities, while the assessment report recommends 5 x 10 mm². Please confirm the correct size.

(e) Please issue one corrected and coordinated feeder schedule confirming, for every new feeder, the source and load, route length, cable construction, conductor formation, number of parallel sets, neutral and protective earth conductor sizes, installation method and duct allocation.

Answer 15 - Feeder cables — construction, sizes and sources

(a) All new site feeder cable installations shall be XLPE-insulated cables in accordance with the amended drawings. The conflicting NYY/PVC cable references in the original

BOQ, including Bill No. 02, Sectionhave0519, has been amended to match the amended drawing requirements.

(b) The correct feeder size to the second-floor UPS board is 5 × 16 mm². See amended

Drawing 07-EX-003.

(c) SDB-2F shall be fed from SDB-G1. The conflicting source designation shown on

Drawing 07-EX-003 has been amended accordingly.

(d) The pump feeder shall be 5 × 6 mm², as indicated in the amended drawings and BOQ.

Refer to the amended BOQ, Bill No. 02, Item 260519.06.

(e) The Contractor shall prepare and submit coordinated shop drawings and feeder schedules showing the final source and load, routing, cable construction and size, conductor formation, number of parallel runs, neutral and protective-earth conductor sizes, installation method, duct allocation, and actual route lengths with the installation method for approval prior to installation.

Question 16. Panel schedules, board status and surge protection

J.2.5, Section 262416 (2.1 to 2.2); J.2.6, drawings 07-EX-003 and 005; J.2.8 and J.2.9, items 262416.01 to .02

(a)The CMDB feeder breaker to SDB-CDC-OF is shown as 200 A on drawing 07-EX-

005 and as 250 A in Bill 02. Please confirm the correct rating.

(b) Please confirm the status of MDB, SDB-CDC-OF and SDB-2NEW as new, existing to remain, or existing to be modified, and identify the extent of any modification required to existing boards.

(c) Section 262416 requires Type 2 surge protective devices, the drawings note Type 1 at

CMDB and SDB-PUMP and Type 2 elsewhere, and the Bills of Quantities describe

Type 1 devices on all listed boards. Please confirm the type, pole configuration, ratings and backup protection required at each board.

(d) Please issue final coordinated panel schedules confirming, for each board, its status, location, busbar rating, main and branch device ratings, enclosure type and mounting, spare capacity and short-circuit current rating.

Answer 16 — Panel schedules, board status and surge protection

(a) The correct rating for SDB-CDC-OF is 250 A/3P. The CMDB panel schedule on

Drawing 07-EX-005 has been amended to reflect the corrected feeder breaker rating.

The amended BOQ and amended Design Report both support the existing 250 A/3P capacity.

(b) SDB-CDC-OF and SDB-2NEW are existing panelboards. The MDB is associated with the NRL laboratory construction. Refer to the amend Electrical Design Report for the applicable board arrangement and scope.

(c) The CMDB shall be provided with a Type 1 surge protective device, and all downstream panelboards shall be provided with Type 2 surge protective devices. The affected panel schedules on Drawing 07-EX-005 and the applicable BOQ Section

262416 descriptions have been amended accordingly.

(d) Refer to the panel schedules provided on the amended electrical drawings for the board ratings and configuration. The Contractor shall verify and coordinate the final busbar ratings, main and branch breakers, enclosure/mounting, spare capacity, SPD requirements, and short-circuit ratings in the submitted shop drawings prior to fabrication and installation.

Question 17. Underground ducts, manholes and site route quantities

J.2.5, Section 260543 (2.2 to 2.3 and 3.5 to 3.8); J.2.6, drawing 07-EX-008; J.2.7, items

260533.01 and 260543.01 to .03

Drawing 07-EX-008 requires five 110 mm PVC conduits along the site power route, while

Bill 00 measures 46 metres of 110 mm PVC pipe without stating whether this is route length or total installed pipe length. Section 260543 specifies precast reinforced concrete utility structures, while the Bill of Quantities specifies brick or masonry manholes.

(a) Please confirm the total physical pipe quantity, the duct bank configuration and the number of spare ways required.

(b) Please confirm the required manhole construction, together with cover type and load rating, internal partitioning, drainage, grounding and accessories, and issue a coordinated duct bank profile and manhole details for the complete route.

(c) Drawing 07-EX-008 carries annotations reading that a trench is more appropriate, that a well-prepared trench exists, that the Contractor shall decide on site, and that the direction should be verified on site. Please confirm the final site power route and whether any existing trench is to be reused, so that the site works can be priced on a defined basis.

Answer 17 - Underground ducts, manholes and site route quantities

(a) The total underground power route shall be approximately 63 m from the transformer to the generator house. Provide five (5) parallel 110 mm PVC conduits along this route.

The BOQ has been amended to reflect the corrected route length and conduit quantity.

(b) The manhole type, dimensions, and quantities shall be in accordance with the amended

BOQ. The conflicting requirements in Section 260543 are amended to match the amended BOQ. Covers, drainage, grounding, cable supports, duct entries, and other accessories shall be provided as required for a complete installation.

(c) The final route shall be selected by the Contractor based on actual site conditions and coordinated with the Government prior to installation. The existing trench may be reused where it is suitable and aligns with the selected route. The Contractor shall include the required trenching, duct installation, and associated site works in the price.

Question 18. Grounding and bonding scope

J.2.4, 1.2.4; J.2.5, Sections 260526 (3.2 to 3.7) and 260543 (3.8); J.2.6, drawings 07-EX- 006 and 008; J.2.7, items 260526.01 and 260543.01 to .03

(a) Bill 00 measures a single 15 metre run of 1 x 240 mm² bare copper conductor to one earthing rod and manhole, while the design and specifications require grounding of the transformer, both generating sets, the CMDB and service equipment, and the utility structures, together with bonding to other system electrodes and to the structural frame.

Please issue a complete grounding and bonding layout and schedule identifying all new and reusable electrodes, conductor sizes and routes, bonding points, test wells, and the acceptance resistance required at each location.

Answer 18 - Grounding and bonding scope

(a) The grounding and bonding installation shall be in accordance with Drawings 07-EX-

006 and 07-EX-008 and Section 260526. The Contractor shall provide all grounding conductors, electrodes, bonding connections, test wells, and associated accessories required for a complete grounding system.

The required grounding resistance values shall comply with Section 260526 and shall be verified by testing prior to final acceptance.

Question 19. Ceiling system — metal pan versus acoustic tile

J.2.5, Section 095123 and missing Section 095133; J.2.6, drawings 07-AR-109, 07-AR- 400 and 07-DM-109; J.2.9, items 024100.01 and 095133.01

Section 095123 specifies 610 x 610 mm mineral-base acoustical tile, while the drawings and Bill of Quantities require a 600 x 600 mm unperforated metal ceiling by Knauf

Armstrong, model Orcal. Section 095133 is referenced but is not included.

(a) Please confirm that the metal ceiling is the final requirement, and issue Section 095133 or an equivalent performance schedule covering tile thickness, suspension system, finish and color, acoustic and fire performance, access panels, perimeter treatment, luminaire and support coordination, and seismic restraint.

(b) The demolition notes require removal of all ceilings and refer to preparation for new tiles. Please confirm that this refers to the metal ceiling system.

Answer 19 - Ceiling system — metal pan versus acoustic tile

(a) The 600 × 600 mm suspended acoustical metallic pan ceiling system is the final requirement. New Section 095133 has been issued to define the applicable metal ceiling requirements, and the relevant drawings and BOQ have been amended as necessary to maintain consistency.

(b) Yes. The demolition notes refer to removal of the existing suspended ceiling system in preparation for installation of the new metallic ceiling. Contractor should visit site and confirm type of ceiling to be demolished. Existing ceiling tiles/panels and metal suspension frames shall be carefully removed and handed over to the Client at the designated location, unless otherwise directed.

Amended Documents:

• Technical Specification: Section 095133 – Acoustical Metal Pan Ceilings and added for CLG-01.

• Drawing 07-AR-109 revised replacement note to expressly state CLG-01 acoustic metal Pan ceiling system.

• BOQ Item 095133.01: retain as the governing ceiling type.

Question 20. Emergency and exit luminaires — battery architecture and schedule.

J.2.3, RZB luminaire cut sheets; J.2.4, 1.2.6; J.2.5, Sections 265119 and 265219 (2.2 to 2.3); J.2.6, drawings 07-EX-001 and 002; J.2.9, items 265119.E1 to. EM

The cut sheet provided for RZB Varioplast I, model 672182.002.89, describes a central-battery luminaire with no integral battery, while Section 265219 requires self-contained nickel-cadmium units and the design report requires between one and three hours of autonomy. No central battery system is included in the Bill of Quantities. The same model is used for both the EM and EX type marks, described at 5 W and 8 W respectively.

(a) Please confirm the required emergency lighting power architecture and the autonomy period.

(b) Please issue a final luminaire schedule confirming type marks, quantities, model or approved-equal performance, mounting, wattage and lumen output, correlated colour temperature, colour rendering index, IP rating and exit pictogram requirements.

Answer 20 - Emergency and exit luminaires — battery architecture and schedule

(a) Emergency and exit luminaires shall be provided with self-contained battery backup for up to 3 hours. The BOQ and catalogue cut sheet are amended accordingly. Refer to the amended J.2.5 Technical Specification Section 265219 for the emergency battery requirements.

(b) Refer to the electrical drawings and revised catalogue cut sheets for the final luminaire type, model or approved equal, wattage, mounting, lumen output, CCT, CRI, IP rating, and exit pictogram requirements. The luminaire schedule and BOQ will be coordinated accordingly.

Question 21. Lighting control system scope

J.2.4, 1.2.6; J.2.5, Sections 260923 and 265119 (1.1(B)); J.2.6, drawing 07-EX-002;

J.2.9, items 260923.02 to .04

(a) The design report describes a building-wide low-voltage lighting control system with distributed control panels, and Sections 260923 and 265119 refer to timers, contactors, photoelectric relays and occupancy sensors, while the drawings and Bill of Quantities provide only local manual switches. Please confirm that automatic or centralized lighting controls are excluded from the scope, or issue the control panel and sensor layouts, control schematics, sequence of operation and corresponding Bill of Quantities items.

Answer 21 - Lighting control system scope

(a) Follow the electrical drawings, legend, and BOQ for the lighting control requirements.

The project shall use localized manual lighting controls as indicated, including the specified local wall switches. Automatic or centralized lighting control panels, occupancy sensors, timers, and similar control equipment are not part of the base scope unless specifically shown. Refer amended BOQ Items 260923.02–260923.04: for the governing lighting-control scope.

See amended Electrical Design Report, Section 1.2.6, clarifying that localized lighting control is the governing requirement.

Question 22. Wiring devices, trunking and data cabling

J.2.3, Legrand catalogue cut sheet; J.2.4, 1.2.5; J.2.5, Section 262726 (2.2 to 2.3); J.2.6, drawing 07-EX-004; J.2.9, items 262726.01 to .05 and 260533

(a)The design report and catalogue cut sheets indicate Schuko, German-standard receptacles, while Section 262726 specifies NEMA 5-20R, a 125 V configuration, on a 220 V system. Please confirm the governing receptacle and plug standard, the voltage and current rating, the shuttering and earthing requirements, and the standard and trip level applicable to residual current or GFCI protection.

(b) Drawing 07-EX-004 does not contain a dimensioned trunking detail, while the Bill of

Quantities requires 173 metres of two-compartment 50 x 130 mm trunking. Please confirm the trunking material, dimensions, compartment segregation and capacity, support frames, fittings, earthing and firestopping requirements.

(c) Please confirm whether data and telecommunications cabling is included within the

Contractor's scope, or whether the trunking is to accommodate cabling installed by others.

Answer 22 - Wiring devices, trunking and data cabling

(a) All power receptacles shall be 220 V, Schuko/German-standard type, with protective earth. RCD/GFCI protection is not required. The conflicting NEMA 5-20R references in Section 262726 (paragraphs 2.2 – 2.3) are amended accordingly.

(b) Provide the trunking in accordance with the BOQ description: 50 × 130 mm, two-compartment trunking, with separate compartments for power and data/telecommunications, including the required support frames, fittings, accessories, and complete installation. Refer BOQ Item 260533.00 and Items 262726.01–.05:

retain the trunking quantity and receptacle quantities, coordinated with the corrected

Schuko requirement.

(c) Data and telecommunications cabling is not included in the Contractor’s scope. The

Contractor shall provide the specified trunking/pathway for data and telecommunications cabling to be installed by others.

Question 23. Temporary power and permitted outage windows

J.2.1, III(j) to (l) and IV.2(d); J.2.6, drawing 07-EX-006; J.2.7 to J.2.10, Bills of Quantities

The Statement of Work prohibits unapproved interruption of power and requires temporary power to be maintained for CDC operations, refrigeration, UPS-backed systems, emergency services and IT infrastructure, but no temporary power load schedule or connection arrangement is provided.

(a) Please provide the minimum critical load and voltage to be maintained, the permitted outage windows, and the approved temporary connection points.

(b) Please confirm whether the provision, operation, fuelling and removal of temporary generating plant, transfer equipment and cabling are incidental to the relevant Bill of

Quantities items, or whether they are to be separately measured, and confirm any redundancy, fuel storage and noise emission requirements.

Answer 23 - Temporary power and permitted outage windows

(a) Refer to the riser diagram for the CDC office and UPS-connected loads that must be maintained during work. Any planned outage shall be coordinated in advance with

CDC/EPHI facility management and shall not proceed without prior approval. The

Contractor shall propose the temporary power connection points and outage sequence for approval before implementation.

(b) Temporary power required to maintain CDC operations during construction shall be provided, operated, fueled, maintained, and removed by the Contractor as part of the purchase order scope. No separate BOQ payment item is provided. The Contractor shall size the temporary generating plant, transfer equipment, and cabling to support the required critical loads and submit the proposed temporary power arrangement for approval before any interruption of the permanent supply. Refer to SOW Section III(J)–

(L) and Section 015000 – Temporary Facilities and Controls. The Contractor shall submit an Outage Request Plan identifying the proposed outage timing, temporary connection points, and transfer sequence. No predetermined outage window applies;

all outages require prior approval and coordination with CDC/EPHI facility management.

Question 24. Drawing register and sheet numbering

J.2.6, drawing 01-GN-001; drawings 07-EX-001 to 008

(a) The proposal sheet list on…