arkeray is a professional main contractor specialising in the fit-out

and refurbishment of office buildings and commercial premises within Central London and the southern Home Counties. The company’s specialist teams undertake a variety of projects ranging in size and scale, valuing from £250k up to £1.5m+.

PROJECT Centiel worked with Parkeray and consultants Troup Bywaters + Anders to deliver the project which was supported by one of Centiel’s latest fourth generation modular power protection systems. A new operational facility was required

for a global firm of professional intermediaries located in the Verdi Building, adjacent to Victoria Station, London. This firm, who work in the financial, energy and commodities markets, appointed Parkeray as the main fit-out contractor for the project. The specification called for a UPS system to provide two hours’ back-up in the event of a mains power failure. Major considerations were redundancy, high efficiency and low noise, with special attention to weight distribution due to some structural limitations in the area of the proposed installation.

CHALLENGES The project presented Centiel’s team with several operational challenges to overcome. The new comms room was situated on the third floor above a large atrium. As the UPS unit itself has a small footprint and low weight, it could be positioned within the normal floor area. However, because of the required two- hour run time, the 13 tonnes of batteries needed to be situated above an unsupported area of roof space over the building’s main reception area. The next challenge was the delivery and

positioning of the batteries themselves. Restrictions on lorries entering Central

Commercial fit-out company, Parkeray, recently appointed Centiel to supply and install a complete UPS system for an office project located in Central London

individual power units, triple bus communications, intelligence (CPU and communication logic), static bypass, control, and display. In the unlikely event of a module failure, the module can be quickly and safely hot-swapped without transferring the load to raw mains. The two-hour battery system

London during working hours prevented deliveries after 6am. Due to the weight restrictions on the third floor, stacking of batteries was also prohibited. These logistical challenges were also combined with tight timescales with only one week programmed for the installation process.


Redundancy and high efficiency was ensured with two Centiel CumulusPower Modular UPS units of 80kVA each. CumulusPower is a three-phase, modular UPS system offering ‘nine nines’ system availability with very low total cost of ownership. Unlike traditional multi-module systems, the CumulusPower technology combines a unique Intelligent Module Technology (IMT), with a fault-tolerant parallel Distributed Active Redundant Architecture (DARA), to offer availability of 99.9999999 per cent. This high system availability is achieved through fully independent and self- isolating intelligent modules - each with

The specification was for a UPS system to provide two hours’ back-up

comprises two steel battery racks to hold four strings of battery blocks per UPS unit. Bespoke steel girders strong enough to support the batteries were bolted to the main pillars across the centre of the building. This large fabrication of steelwork was joined together with substantial metal plates which required bespoke battery racks and ensuring the weight was distributed properly over the new span of steelwork. For ease of future upgrade, the battery rack was installed with space for installation of future batteries and an open type was chosen for ease of maintenance. The weight and access restrictions

meant that delivered batteries were unable to be stacked adjacent to the area whilst the racks were being assembled, onto the steelwork. Therefore, the team was required to accept only one pallet of batteries per day and carry them from the delivery area and load them onto the rack individually.




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