How to Build a Data Center?（一）

—A Complete System Checklist, All in One Place!

A reliable data center = site selection + design + ten core subsystems + compliant acceptance. Many people think a data center is just “a room with a few racks.” In fact, ten subsystems work together: fit-out, power distribution, UPS, precision cooling, cabling, racks, fire suppression, security, monitoring, and grounding. Skip any one of them, and downtime will come back to haunt you within three years. This guide walks through the entire data center build process, step by step. Use it to review vendor proposals and verify budgets with confidence.

一、Follow the Right Process — Five Steps, Not Impulse Buying

First, define your requirements. Analyze business impact, set RTO/RPO targets, and estimate rack count and power density for the next 3–5 years. Then pick a site: avoid basements and flood zones, avoid strong EMI sources, and confirm floor loading ≥ 800 kg/㎡ (≥ 1000 kg/㎡ for battery and UPS areas).【source】

Next, complete scheme and detailed design. Deliver floor plans, airflow layouts, power topologies, fire zones, and monitoring point maps. Check every parameter against GB 50174-2017.【source】

After that, move into procurement and construction (8–16 weeks). Multiple contractors work in sequence. Photograph all hidden works for documentation.

Then run commissioning and acceptance (2–4 weeks). Test UPS under load, cooling redundancy switching, fire linkage, and power-failure drills, per GB 50462.【source】

Finally, run a 2–4 week trial. Hand over formally after 72 hours of stable operation, along with as-built drawings and O&M manuals.

In total, a traditional data center takes 6–12 months. However, a prefabricated modular data center can compress this to 30–60 days. For this reason, modular designs now dominate: over 60% of new Asia-Pacific data centers in 2026 use prefabricated modular architecture.【source】

二、The Full Data Center Checklist — Ten Subsystems Explained

This is the core of the guide. Each subsystem follows the same structure: role, equipment list, and selection tips. Copy it straight into your procurement list.

📦 Module 1 | Fit-Out System

Data center fit-out delivers a dust-free, anti-static, insulated, and fire-rated shell.

Equipment list: anti-static raised floor (≥ 350mm; 400mm recommended), steel or aluminum sandwich wall panels, perforated aluminum ceiling tiles, Class-A steel fire doors, fire-rated glass partitions, 15–20mm rubber insulation under the floor, anti-static coating, stainless skirting, and steel base frames for heavy equipment.【source】

Selection tips: ground all ceiling grids with 6mm² dual-color cable, then bond to the ground bar with 16mm² — contractors skip this step constantly, so check test records. Also insulate under the raised floor to prevent condensation during cooling airflow.

⚡ Module 2 | Power Distribution System

Power distribution feeds utility electricity safely to the UPS, cooling, lighting, and racks.

Equipment list: incoming utility panels, ATS transfer cabinets, UPS input/output panels, row-level PDU cabinets (or busway), rack PDUs, surge protectors (SPD) at every level, and cable trays.

Selection tips: Class A needs two utility feeds from different substations; Class B can accept one feed plus backup. Bury armored feeder cables directly or in conduit at ≥ 0.7m depth. In addition, meter every distribution node and upload voltage, current, and power data to the monitoring platform.【source】

🔋 Module 3 | UPS System

The UPS bridges power loss seamlessly and buys time for generator startup.

Equipment list: UPS units (tower or modular), battery strings (VRLA or lithium) with cabinets or racks, battery monitoring units, and maintenance bypass.【UPS】

Selection tips:

• Size the UPS at IT load × 1.2; modular units allow hot-swap expansion.
• Backup time: Class B ≥ 1 hour; Class A relies on generators, so 15–30 minutes of UPS time is enough.
• A common mid-size setup pairs two modular UPS units in 1+1 redundancy, with input PF > 0.99 and harmonics < 3%.
• Calculate battery count in 2V cells — do not let vendors quote inflated 12V block counts.【source】

❄️ Module 4 | Precision Cooling and Fresh Air

Data center heat is 95% sensible heat. Precision cooling — high airflow, small enthalpy difference, sensible heat ratio ≥ 0.9 — holds temperature within ±1℃ and humidity within ±5%.【source】

Equipment list: CRAC/CRAH units (room-level, in-row, or rack-mounted), humidifiers, fresh-air exchangers (for positive pressure and CO₂ dilution), leak detection ropes, condensate drains, and ducting.

Selection tips:

• Estimate IT heat at 3–5 kW per rack, then add envelope gains (10–15% of IT load), lighting (~10W/㎡), and people (0.5 kW each), plus 10–30% headroom.【source】
• Redundancy: N+1 for Class B, 2N for Class A.
• Supply air under the raised floor as standard. For high density, choose in-row cooling — it cools near the source and beats room-level units on efficiency.【source】
• Moreover, reserve liquid-cooling interfaces now; AI servers will likely force a retrofit within two years.

🔌 Module 5 | Structured Cabling

Cabling is the vascular system of a data center, carrying every network and fiber link.

Equipment list: Cat 6/6A UTP, OM3/OM4 multimode and single-mode fiber, copper and fiber patch panels, ODFs, network racks, KBG steel conduit, 300×100 metal trays, fiber troughs, and cable managers.

Selection tips: Class B needs redundant backbone paths; Class A needs redundant horizontal cabling too. Prefer overhead cabling — trays above the racks keep the underfloor plenum clear for airflow. Also separate power and data physically, with ≥ 300mm spacing to prevent crosstalk.【source】

🗄️ Module 6 | Racks and Hot/Cold Aisle Containment

Racks carry the IT hardware; aisle containment cuts energy waste and kills hot spots.

Equipment list: 42U racks (600×1200×2000mm or 600×1000mm), intelligent PDUs, containment roofs with fire-release panels, aisle end doors, grounded base plates, temperature/humidity and leak sensors, and vertical cable managers.

Selection tips: containment sharply reduces PUE by stopping air mixing. However, the roof panels must auto-open on fire alarm — otherwise fire acceptance fails. Plan rack loading, PDU outlets, and cable depth up front; do not fish cables in later.

🚒 Module 7 | Fire Suppression

Data centers ban water, foam, and dry powder. Only clean-agent gas suppression protects IT equipment.

Equipment list: HFC-227ea (FM-200) or IG541 systems (pipework or cabinet type), VESDA aspirating smoke detection, point smoke and heat detectors, fire linkage panel, fire dampers, emergency lighting (≥ 5lx in aisles), and breathing apparatus.

Selection tips:

• Use cabinet-type units under 50㎡; pipework systems suit larger halls.
• Linkage logic: two independent detectors alarm → shut fans and dampers → cut non-fire power → 30-second delay → discharge.
• Add hydrogen and CO detectors in battery rooms to catch thermal runaway.
• Use pre-action sprinklers or water mist in occupied zones, not gas.
• Licensed fire contractors must design and install — no DIY here.

See you next blog!