B35 Critical Loop RFIs Current as of 3Mar26.xlsx
XLSX spreadsheet 13 KB Posted
- Attached to
- B35 Critical Loop
- Solicitation number
- W50S7X26QA001
- Issued by
-
Department of the Army National Guard
About this file
This is a Request for Information (RFI) and Answers document for the B35 Critical Loop electrical installation project. The document contains 16 questions and answers clarifying technical specifications and project requirements for contractors bidding on the Kansas National Guard's critical electrical line installation to Building 35's communications room.
Key technical clarifications include: the linear distance between the transformer room and Automatic Transfer Switch is approximately 35 feet; a 200-amp disconnect is required; new (not refurbished) medium-voltage transformers are mandated; core drilling into the existing vault is necessary as no as-built drawings with existing sleeves are available; the specific cable routing will be determined by the contractor rather than following pre-drawn lines; the transformer will be provided by the contractor and must be placed on a 4000 psi reinforced concrete pad minimum 4 inches thick with soil compacted to 95% density; 15KV #2 cable must use tape shield (not concentric neutral) and requires VLF testing; transformer color preference is brown but not required; and a tax-exempt certificate will be issued. Regarding trenching and boring methodology, concrete encasing is only required in open trenching areas using 4000 psi concrete, while horizontal directional boring under existing roads, sidewalks, and concrete pads may use hydrovac trenching with conduit encased in 4000 psi concrete; boring locations that are already under existing surface concrete do not require additional concrete encasing. The contractor must pull 4-inch Schedule 80 PVC conduit for wire pulling in all drilling operations.
View the file
Other files
Show all 13
On GovTribe
Work with this file
- Download the original file
- Contacts named in this file
- Similar government files
- Ask GovTribe AI about this file
Text version
Sheet1
| B35 Critical Loop Request for Information | ||
| Question | Answer | |
| 1 | Could you please provide us with the distance between the transformer room and the Automatic Transfer Switch (ATS) installed within the communication room? | The linear distance is approximately 35’ |
| 2 | Kindly provide the total connected load for the communication room in order to determine the required cable cross-sectional area from the transformer secondary terminals to the Automatic Transfer Switch. | Requires a 200A disconnect |
| 3 | New MV XFMRs usually have a very lengthy lead time. Are we able to provide refurbished MV XFMRs? I have installed these in the past with other applications. These refurbished XFMRs usually come with a longer warranty than new manufactured ones and also go through strenuous tests. Please let me know if providing refurbished XFMRs will be acceptable? | New is required. |
| 4 | Can as/built or record drawings of the existing vault be provided? We are interested in seeing if there are existing sleeves that can be used for new wiring, or if core drilling new openings into the existing vault will be required. | Core drilling will be required. |
| 5 | Typically encased electrical lines can only be accomplished via open trenching, not horizontal boring. Can the concrete encasing be eliminated from the SOW? | Boring will only be required under existing roads, sidewalks, concrete pads, etc. Hydrovac trenching may be utilized in open grassy areas. In areas where hydrovac trenching takes place, conduit to be encased in 4000 psi concrete. |
| 6 | Page 1 of the drawings provided illustrates a red line (COA #1) which we assume is the intended route for the new cabling. Please confirm. | Specific route to be determined by the contractor. |
| 7 | Page 2 and 3 of the drawings provided illustrates a blue line (COA #2), and a green line (COA #3) which we assume are not part of this work scope. Please confirm. | That is correct |
| 8 | Is the new proposed transformer provided by the contractor or gov't? | Transformer to be provided by the contractor. |
| 9 | Is there a requirement for the type of transformer pad? | 4000 psi reinforced concrete, minimum 4” thick, with the soil beneath compacted to 95% density. |
| 10 | Will there be a tax-exempt certificate issued for this project? | Yes |
| 11 | Is 15KV #2 Cable to be tape shield or concentric neutral? | Tape shield |
| 12 | Does the 15KV cable need to be VLF tested? | Yes |
| 13 | Will the transformer need to be painted McConnell Brown? | Brown is preferred but not required. |
| 14 | Is the new proposed transformer provided by the contractor or gov't? | Contractor |
| 15 | The revised SOW states to encase conduit in low density concrete, but note 5 in the RFI states that boring will only be required under existing roads etc. with no mention of encasing. Is it required for all new conduit to be encased in concrete? Example, if you trench, encase in 4000psi concrete, and if you bore, encase in low density cellular concrete. Or, is concrete encasing only required at the trenching locations as the boring locations would already be under existing surface concrete. Please advise. | Concrete encasing is only required at areas of open trenching |
| 16 | Please provide the diameter and thickness of the steel casing required and the type of concrete. Our boring contractor requires this information to ensure they meet the Horizontal Directional Drilling requirements stated on page 1 of the SOW. | There is nothing in the SOW about steel casing and the concrete is specified to be 4000 psi concrete where it is to be used. We do call for them to pull 4” conduit for the wire but that conduit is typically schedule 80 PVC conduit. |
File details come from the government source that posted it. Updated .