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ELECTRICAL RESILIENCE


should meet appropriate standards and conform with the battery manufacturer’s requirements.


Bespoke design


Retrofitting designs into existing buildings – while appearing the optimum solution – may not work, due to space limitations, lack of alternative supplies, weight limits on structured floors, or other reasons. A bespoke design should be considered which may provide the best solution. Modular systems, which can be installed into limited space, yet scaled to support future load growth, offer a useful solution to space challenges.


Kohler describes the PowerWAVE 9000DPA as ‘a revolutionary rack- mounted, transformerless UPS system with 99.9999% power availability’.


a short time over a wide temperature range – typically from –15˚C to +50˚C – their ambient temperature should be kept as close as possible to +20˚C. Otherwise, life expectancy will be reduced considerably; typically to 50 per cent at 30˚C, and 25 per cent at 40˚C. With continued operation at high temperatures, these batteries can also become a fire hazard, as the casing can split, causing acid to spill, possibly resulting in uncontrolled battery DC earth faults. It is therefore essential that the battery’s environment has ventilation/ cooling sufficient to maximise battery life. Consideration should be given to monitoring the temperature (remote alarm) of the environment in locations containing batteries, allowing rapid response to any problem. Correct charging of batteries is also very important – therefore, any charger


In all cases, designers should consider the local space and location of the UPS in terms of floor loading, access for maintenance, heat generated, and room conditions such as dust and proximity to wet services, especially if located above. All these conditions may affect equipment life, reliability, and resilience. Even the most efficient double-conversion UPS systems will radiate a small percentage of their input power as heat; this must be vented, preferably naturally.


Environmental considerations HTM 06-01 states that environmental conditions should control the room space to the limits recommended by the manufacturer. KUP addresses this both through specifications provided with each UPS system it offers, and more broadly through its UPS Handbook. Environmental considerations such as humidity and audible noise, as well as heat considerations, should be carefully considered. In addition, transporting a UPS to site, and then positioning it into a suitable location, will need to be factored in. Depending on the UPS size, this could be in an office, computer room, UPS room, or existing plant room.


Conclusion


From the UPS Handbook, and the HTM 06-01 document, it’s clear that providing the right environment is essential to the UPS, battery reliability, and longevity.


The two documents give guidance for healthcare estate managers on providing safer, more resilient electrical systems within their premises, that support the requirements of regulators, and ensure a safe environment for patients and staff. Success depends on selecting components of good quality well-suited to their application – and then setting up a maintenance strategy to sustain optimum performance. Accordingly, it always pays to discuss your UPS installation requirements with a supplier like KUP, which has the width and depth of product range, expertise, and nationwide service coverage essential for assuring that all of these factors are in place.


hej


Alex Emms


Alex Emms is Operations director for Kohler Uninterruptible Power. He has 30 years’ experience of the power protection business, and 19 years’ service at KUP. He started out as a Field Service engineer, progressing to senior Engineer, supervisor, Service manager, and now Operations director. He has an HNC in Electrical & Electronic Engineering, and a CMI Level 5 Diploma in Management & Leadership.


September 2020 Health Estate Journal 55


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