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| Table 1 Data centre redundancy levels summary | ||||
| Tier 1 | Tier 2 | Tier 3 | Tier 4 | |
| Electrical | ||||
| Utility | N | N | N | 2N |
| Generator systems | N | N | N+ | N+2 |
| UPS systems | N | N | N+1 | 2N |
| Power distribution systems | N | N | N/N+1 | 2N |
| Mechanical | ||||
| Heat rejection equipment | N | N+1 | N+1 | N+1 |
| Chilled water | N | N+1 | N+1 | N+2 |
| Chilled water risers | 1 path | 1 path | 1 path | 2 path |
| Chilled water piping | 1 path | 1 path | 1 path | 2 path |
| Computer room air distribution | N | N+1 | N+1 | N+1 |
| Availability | 99.671% | 99.741% | 99.982% | 99.995% |
| Tier 1 – Single path for power and cooling distribution, no redundant components%3Cbr /%3ETier 2 – Single path for power and cooling distribution, redundant components%3Cbr /%3ETier 3 – Multiple power and cooling distribution paths, but only one path active, redundant components, concurrently maintainable%3Cbr /%3ETier 4 – Multiple active power and cooling distribution paths, redundant components, fault tolerantDefinitions:%3Cbr /%3EFault tolerant – A site that can sustain at least one planned site infrastructure failure with no critical load impact%3Cbr /%3EConcurrently maintainable – A site that is able to perform planned site infrastructure activity without shutting down critical load | ||||
| Cost breakdown | ||||
| Item | Unit | Quantity | Rate | Total |
| Disposal and water installations | ||||
| Rainwater goods; downpipes and gutters | m2 | 8,500 | 6 | 51,000 |
| Soil, waste and vent | m2 | 8,500 | 9 | 76,500 |
| Condensate drainage from ACUs and FCUs | m2 | 8,500 | 6 | 51,000 |
| Hot and cold water services | Item | 1 | 127,500 | 127,500 |
| Space heating and air treatment | ||||
| Chilled water plant with redundancy of N+1 to provide 1000W/m2 cooling to the technical space | Item | 1 | 2,040,000 | 2,040,000 |
| Chilled water distribution to data centre to freestanding to freestanding cooling units with associate | Item | 1 | 2,987,200 | 2,987,200 |
| Supply and extract ventilation to technical space, switchrooms and ancillary spaces, including grilles and diffusers | Item | 1 | 2,120,000 | 2,120,000 |
| Freestanding room air-conditioning units with redundancy of N+20% to technical space and switchrooms | Item | 1 | 1,657,500 | 1,657,500 |
| Air-conditioning to offices areas; two pipe fan coil with electric reheat | m2 | 550 | 210 | 115,500 |
| Communications room cooling | Item | 1 | 7,500 | 7,500 |
| Toilet extract installation; kitchen extract system | Item | 1 | 27,500 | 27,500 |
| Gaseous and smoke extract systems to technical spaces complete | m2 | 5,100 | 10 | 51,000 |
| Electrical installations | ||||
| High voltage switchgear, transformers and distribution based on a requirement of a 6MVA dual supply | Item | 1 | 500,000 | 500,000 |
| Main and sub-main installation comprising of switchgear, power factor correction, cabling, busbar and distribution equipment | Item | 1 | 2,000,000 | 2,000,000 |
| Low voltage distribution to support areas directly fed from main LV panel | m2 | 550 | 18 | 9,900 |
| Clean earth system; to plantrooms & technical spaces | m2 | 7,950 | 10 | 79,500 |
| PDUs complete with isolating TX and an average of 160 SP outgoing ways, (based on 40 fed from UPS output panel) | Item | 1 | 1,600,000 | 1,600,000 |
| Dual power supplies to PDUs (225kVA ave 75m) | Item | 1 | 750,000 | 750,000 |
| Emergency power off installation | Item | 1 | 20,000 | 20,000 |
| Underfloor power distribution to cabinet locations, based on a requirement of 3,200 cabinets dual fed | Item | 1 | 2,300,000 | 2,300,000 |
| Small power distribution to technical spaces for general use | m2 | 5100 | 5 | 25,500 |
| Small power distribution to plant areas | m2 | 2850 | 15 | 42,750 |
| Small power distribution to support areas; busbar and floorbox to office areas, wall mounted elsewhere | m2 | 550 | 35 | 19,250 |
| Lighting installation | m2 | 8500 | 15 | 127,500 |
| Luminaires and lamps | m2 | 8500 | 30 | 255,000 |
| Extra over for luminaires and lamps to support areas | m2 | 550 | 50 | 27,500 |
| Emergency lighting installation | m2 | 8500 | 10 | 85,000 |
| Power and containment to cooling units in technical spaces, based on a required of 82 units with dual feeds | Item | 1 | 120,000 | 120,000 |
| Power and containment to mechanical services in plantrooms | Item | 1 | 25,000 | 25,000 |
| Containment in plantrooms; trunking, tray and ladder rack | m2 | 2850 | 20 | 57,000 |
| Power and containment to serve BMS, CCTV and fire alarm system in technical areas | m2 | 5100 | 10 | 51,000 |
| IT containment to technical spaces, based on 600mm basket supported on channel run to cabinet locations | m2 | 5100 | 20 | 102,000 |
| IT containment to support areas, generally | m2 | 550 | 15 | 8,250 |
| Standby generator installation – 5 1,500kVA units, providing N+1 (rate based on £160/kVA) | Item | 1 | 1,700,000 | 1,700,000 |
| UPS installation – 16 x 800kVA (4 x 3.2MVA) static units, providing full (2N) redundancy; 10 min autonomy (based on £200/kVA) | Item | 1 | 2,560,000 | 2,560,000 |
| UPS input/output panels and distribution | Item | 1 | 1,600,000 | 1,600,000 |
| Glazed feature lifts; hydraulic; 13 person, serving 2 stops each | Item | 1 | 80,000 | 80,000 |
| Passenger/goods lift; hydraulic; 21 person, 1600kg; serving 2 stops; dock leveller | Item | 1 | 100,000 | 100,000 |
| Gas installations | Item | 1 | 40,000 | 40,000 |
| Protective installations | ||||
| Earthing and bonding | m2 | 8500 | 5 | 42,500 |
| Lightning protection | m2 | 8500 | 2 | 17,000 |
| Pre action sprinkler installation to plant areas | m2 | 2850 | 35 | 99,750 |
| Sprinkler installation to offices | m2 | 550 | 30 | 16,500 |
| Gaseous fire suppression system to technical area | m2 | 5100 | 220 | 1,122,000 |
| Leak detection | m2 | 5100 | 20 | 102,000 |
| Communications installations | ||||
| Fully addressable fire and smoke detection and alarm system to plant and support areas | m2 | 3400 | 18 | 61,200 |
| Allowance for interface of fire and smoke detection system with gaseous extinguishing installation | m2 | 5100 | 2 | 10,200 |
| VESDA Installation to technical areas | m2 | 5100 | 50 | 255,000 |
| Intruder detection, based on monitored door, windows and PIR detection | m2 | 8500 | 5 | 42,500 |
| Alarm installation to disabled toilets | Item | 1 | 1,500 | 1,500 |
| CCTV installation to technical spaces, based on a full requirement of CCTV in all aisles between cabinets (160 fixed cameras) | Item | 1 | 650,000 | 650,000 |
| CCTV installation to plant and support areas | Item | 1 | 70,000 | 70,000 |
| Access control system to technical spaces; (25 readers); plant & support areas (18 readers); door entry system to support areas | Item | 1 | 107,000 | 107,000 |
| Containment for security system | m2 | 8500 | 8 | 68,000 |
| Building management system | m2 | 8500 | 35 | 297,500 |
| Extra for enhanced BMS in technical and plant spaces | m2 | 7950 | 15 | 119,250 |
| Electrical monitoring system | m2 | 8500 | 50 | 425,000 |
| Total cost: £27,104,250 | ||||