251780_-_CC_ADF_Lower_B_Generator_-_MDE_Addendum_1.pdf
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- Solicitation number
- 2026-063
- Issued by
- Collin County, Texas
About this file
This is an Addendum #1 to the project specifications for the Collin County Adult Detention Facility (CCADF) Lower B Generator Replacement project, issued by MD Engineering, LLP on December 11, 2025. The addendum addresses four clarification questions submitted by prospective bidders regarding the generator installation project. The addendum clarifies that the Automatic Transfer Switch (ATS) specifications are ATS-C at 400 amp, 3-phase with switching neutral and ATS-LBA at 400 amp, 3-phase with non-switching neutral. The generator output breaker specification is corrected from 1000 amps to 1600 amps, as shown on the one-line diagram with kirk-key interlock. The temporary heating and cooling requirement for building climatization is omitted from the General HVAC Note 1. The addendum confirms that the generator is radiator-cooled rather than air-cooled and directs contractors to conduct site inspections to verify existing conditions, materials, wiring methods, and compliance requirements per the contract documents.
The addendum does not address pricing, set-asides, incumbent contractors, or funding sources, as it functions solely as a technical clarification document. The responses provided are binding modifications to the original project specifications and must be incorporated into all bid submissions. Prospective bidders are required to have attended one of the mandatory pre-bid meetings held on December 2 or December 4, 2025, to obtain the complete electrical and mechanical drawings. The bid submission deadline is December 18, 2025, at 2:00 p.m., with an estimated probable construction cost of $1,100,000.00 and anticipated contract award within 90 calendar days after bid opening.
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Text version
1255 W. 15th Street, Suite 300 Plano, Texas 75075 www.md-eng.com (TBPE F-7489) P:469.467.0200 F 469.467.0300
ADDENDUM #1
PROJECT TITLE: Collin County ADF Lower B Generator
MD PROJECT #: 251780
DATE: December 11, 2025
QUESTIONS
Question 1 - We could not locate the size of the ATS’s. Please provide the size for ATS-LBA and ATS-C.
Response:
ATS C – 400 amp 3 phase with switching neutral ATS LBA – 400 amp 3 phase with non switching neutral
Question 2 - Per E.01 the generator output breaker is 1000 AMPS, however the existing emergency distribution panel is 2000 AMPS. It would appear the generator output breaker is undersized. Please confirm this is correct?
Response: The Generator output breaker shall be a 1600-amp breaker, as shown on the one line complete with kirk-key interlock. The 1000 amp generator output breaker shown in the "Generator Specification for Lower B" is in error.
Question 3 - Sheet M0.0 calls for temp heating or cooling as needed to climatize the building. Please confirm this is not required for this project.
Response: Omit the requirement for temporary heat from General HVAC Note 1
Question 4: It is our assumption that the generator is radiator cooled and not air cooled. Please confirm this is correct?
RESPONSE: I believe this is correct. Refer to the specifications:
“SITE INSPECTION
A. The Contract Documents do not propose to show all existing systems material or equipment. Obtain information related to existing facilities from existing documents, measurements, notations, photographs, surveys and other observations at the site.
B. Visit the project site and verify the existing materials, conditions, wiring methods, penetrations through fire rated walls, supporting devices and panelboards. Inspect panelboard interiors, etc. Note any existing conditions which require work to bring the project into code compliance for the occupancy under construction.”
Sincerely, MD Engineering, LLP
David Mindrup, PE http://www.md-eng.com/
File details come from the government source that posted it. Updated .