Electrical drawing book
12.47 kV service stepped to 480Y/277 V, multi-path distribution, UPS and generator interfaces, for 42-rack zones at 136 kW per rack.
Public Edition P1 · PDF · SHA-256K&K Data Service Inc. · Houston, Texas · since 2022
Our GB300-class reference design is public.
We are a Houston contractor for data center field work. We also own a GB300-class data center project, designed and not yet built. Read its drawings before you hire us: electrical, structural, network and liquid-cooling books, 371 pages, free, with no registration.
Rui Liang, Founder
Count CDUs on glycol, not water. MODELED
A water-rated 1.5 MW CDU models at about 1.20–1.28 MW on 25% propylene glycol. The method and the code are public; run them on your own schedule.
How the derate is workedDesign Development — Public Edition: for study, not construction; no engineer’s seal. K&K is independent; GB300 is an NVIDIA product.
- Electrical 88 pages
- Structural 170 pages
- Network 75 pages
- Liquid cooling 38 pages
- Free PDF, no registration, no NDA
- SHA-256 checksum for every file
Read by a stranger, sheet by sheet
“This is an excellent design.”
An r/HPC reader (u/chumbucketeer), after spending an afternoon on the network drawing set we posted in October 2026. He also flagged the MPO-12 optical risk and the missing storage paths. The Public Edition P2 network book now carries a storage-access model and optical-channel checks.
How this differs from vendor reference designs
Schneider Electric’s Reference Design 110, co-engineered with NVIDIA, and Vertiv’s GB300 architecture are public overviews of power and cooling, built around their own equipment. Ours is a set of drawing books from the contractor’s side.
What you get here
- Structural steel and network drawings, not only power and cooling.
- Direct PDF downloads: no form, no registration, no NDA.
- A SHA-256 checksum for every file, and a dated release history.
- Open items printed on the sheets. What is still undecided is marked, not hidden.
What it is not
- Not a construction set, and not sealed.
- Not an NVIDIA document.
- Not an equipment catalog. We do not sell the CDU.
What we build, and who we bring
We self-perform
- Site and civil work
- Foundations, including transformer foundations
- Steel erection
- Freight, rigging and equipment setting
- Retrofits inside live facilities
- Field records through handoff
Through licensed partners
- Electrical installation: licensed electrical contractors
- Mechanical and refrigeration trades, where state licensing applies
- Sealed design: the Engineer of Record named in the project contract
Field record: bitcoin-mining sites, 2023–2025
Our completed field work is in bitcoin mining: high-density, power-heavy sites built on short schedules.
- Bowie, Texas · 20 MW · 2025Site, roads and water, transformer foundations, freight and lifting, and the transition to operations.
- Clinton, Mississippi · 2024 to September 2025Foundations, structure and multi-trade construction with a crew of 11, later 13.
- Arkansas · 2024Retrofit inside an operating mining facility: water curtains, negative-pressure fans, hot/cold isolation and sound attenuation.
- West Texas · 2023 · four sites, 120 MW plannedGround work at two sites, and nearly 100 containers of equipment procured and delivered.
What carries over: civil work, transformer foundations, power-heavy logistics and work inside live facilities. What does not: an air-cooled mining machine draws about 3–4 kW; a GB300-class rack is about 136 kW and liquid-cooled. Full field record
The drawing books
Structural set
The prefabricated steel building system: design basis, member and connection drawings, and technical specifications for rows of liquid-cooled racks.
Public Edition P1 · PDF · SHA-256Network reference design
GPU hall topology, cabling and interface definitions, with a storage-access model and optical-channel checks added in the reissue.
Public Edition P2 · PDF · SHA-256Liquid-cooling reference design
A functional P&ID and coordination set for 90 racks in five groups, with CDU groups, coolant loops and dry/wet cold-source trains.
Public Edition P1 · PDF · SHA-256The analyses behind the drawings
The Data Center Lab works through the numbers the drawings depend on, with each figure labeled by how it was obtained.
- A water-rated 1.5 MW CDU is 1.20–1.28 MW on PG25Count CDUs on the coolant the hall will actually run.
- Strict 2N still misses 0.711 MW in maintenance plus faultRedundancy that holds on paper can fail when one path is already down for work.
- Half a point of UPS efficiency moves 65 kWAt this scale, efficiency is a utility-capacity question, not a brochure number.
Open the Data Center Lab · Two DOI-registered preprints: water use and storage capacity, with code that reproduces the storage dataset
Company facts for qualification
- Legal name
- K&K Data Service Inc.
- Office
- 10750 Hammerly Blvd, Ste 160, Houston, TX 77043
- Founded
- 2022
- Phone
- +1 234-564-0112
- Forms
- Send your qualification form to inquiry@kkdatasvc.com
Start with the site, power status, equipment plan, and delivery constraint.
A short brief is enough to start. Write to us and a named person replies.