NTT Hemel Hempstead 4 Data Center (HH4)

NTT DATA, Inc. · Hemel Hempstead · London Metro · United Kingdom

Design resilience tier: III
Redundancy (as published): Dual dedicated 11,000V (HV) grid connections (2N) · Dedicated N+1 redundant HV substations on-site · Minimum N+1 (UPS) with battery backup · Backup generators · Compressor-less data suite cooling system with a minimum of N+1 redundancy · Concurrently maintainable AHUs · DX cooling to comms rooms (N+1 unites per room) · Direct air cooling to PODs (N+1 fans per section) · Service level agreement: 99.999% power uptime availability (fact sheet 2024). We provide you with the best possible physical and technical infrastructure supported by N+1 UPS systems, N+1 generator backup, as well as N+1 cooling systems. (site brochure 2024)
Max. rack density: 20 kW/rack
Density (as published): Contained hot aisle or chimney rack design for high efficiency cooling up to 20kW per rack (fact sheet 2024)
Power band: 5-20MW
Cooling: Air cooling, Free cooling
Availability: Availability on request
Cross-connect: On request
Renewable power: 100% renewable power

Data trust

ColocationConnectivityHigh-density / AIWholesaleISO 9001ISO 27001ISO 22301ISO 50001ISO 45001ISO 14001PCI DSSISAE 3402ISAE 3000SOC 2

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