Modern Building Services

FEATURE INSTALLER VIEW MODERN BUILDING SERVICES FEBRUARY 2021 19 In a straightforward installation, the linear nature of powertrack systems is very useful for creating neat parallel runs of power distribution, with a scalable layout that can be replicated on every floor. Where there are obstacles in the void, however, it can be difficult to route lengths of track around them because they can only be installed as straight lengths, which need to be laid flat. Where this is the case, the flexibility of a hub system’s umbilicals enables obstacles to be dealt with easily. Power hubs are also ideal for use in buildings where the slab is uneven. In this scenario, if powertrack were to be used, it would have to be installed so that lengths of track were lying at different heights or angles, preventing consistent connections. This could cause issues on the distribution network, compromising entire circuits. Conversely, when using a power hub system, the hub unit can be placed on a flat area of the slab and the performance of the cables within the flexible umbilicals is unaffected when they are routed across uneven surfaces. The flexibility of themetal conduit can also be useful for installations where the service void is very congested because it can be routed around other services without compromising the floor box layout or the integrity of the network. For all these reasons, where there is any question mark over the suitability of powertrack, a hub system should be considered because they not only overcome specific building challenges but also offer ease of installation, ease of maintenance, future flexibility and compliance. CMD Power Hubs are available in 4-way and 6-way units, which can be wired in a series circuit in the required configuration. Tap-offs are made to the side of the power hub unit, using BS EN 61535 compliant connectors in a metal housing to ensure a secure and safe tap-off connection. A choice of tap-off units allows electrical supply to be routed to the required locations, regardless of how densely populated the floorplate will be, while minimising the number of hub units required, thereby keeping costs and installation time down, reducing maintenance and optimising space in the void. Additional hub units or tap-offs to existing units can be retrofitted to the installation at any time, providing the flexibility needed in contemporary commercial buildings for changing occupier requirements, change of occupier or change of use. No additional space is required for plugging in or unplugging tap-offs and multiple power hubs can be configured together on a single circuit. Creative Thinking Finding the right solution tomatch the needs of the building and the client, while working within a tight programme are challenges that contractors must constantly overcome. A power hub system provides an ideal solution, with rapid, cost-effective plug and play installation for a wide variety of projects. For example, for a recent installation at a filmand TV production company, a compact power hub systemwas used tomeet the needs of the shallowfloor void and 900 units were installed to provide the flexible distribution network required in an environment where needs will continue to change. In another example of how power hubs can overcome architectural challenges, a power hub systemhas recently been installed in the ceiling void to service the void-free concrete floor of the level above. Once again, the compact units and potential for reconfiguration were key benefits of using a power hub system. A power hub is not always the most appropriate specification, but, where powertrack is not suitable, a power hub is often the best alternative.