RFI and Responses GA Spillway Transformer and Disconnects 8.13.24.pdf
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- Solicitation number
- W9128F24Q0055
About this file
This document contains Questions and Answers related to a Request for Information (RFI) for the Garrison Dam Spillway Transformers and Disconnects Replacement project, Solicitation # WQ9128F24Q0055. The RFI provides clarifying information about required breaker sizes, bus ratings, and one-line diagram details for the new motor control center (MCC) that will replace the existing equipment. The related federal contract opportunity is for a supply contract to replace the existing 13.8kV/480V spillway transformers, disconnect switches, and MCC. The new transformers will be delta-wye configuration, potentially upsized from the existing 225kVA rating. High resistance grounding will be added to the new transformers. The contract will be awarded by the US Army Corps of Engineers Omaha District, with an anticipated NAICS code of 335311 - Power, Distribution and Specialty Transformer Manufacturing.
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Questions and Answers
Garrison Dam Spillway Transformers and Disconnects Replacement
Solicitation # WQ9128F24Q0055
13 August 2024
1. Per 2.4.1 the solicitation did not include breaker sizes or trip ratings. Can the customer provide for breakers sizes and trip ratings required for #3 through #14.
USACE Response: See document attachment in SAM.gov titled “Motor Control Center
Configuration” for breaker sizes and trip ratings.
2. Please address missing horizontal bus amps and the main device breaker trip ratings.
USACE Response: See following paragraph in specification 26 28 00.00 10:
2.8.2.1 Horizontal Bus
Provide each control center assembly with a three-phase main horizontal bus, with a continuous current rating not less than 600 amperes, located across the top of each vertical section. Drill the end of horizontal buses for future extensions.
3. Can you provide a load list or another oneline specific to the MCC portion?
USACE Response: Drawing sheet for E-901 is the one-line for the existing MCC. Circuit designations and breaker sizes for the new MCC can be found in the Motor Control
Center Configuration file. This file was uploaded to SAM.gov on 30 July 2024.
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