[ Spotlight: Circuit protection ] What’s new in circuit protection?
DB751 – lockable 80A fused main switch (100A max) – and DB701 – lockable 80A fused main switch – introduce the ability to lock the main isolator
in the ‘off’ position. By providing protection against the power supply being unintentionally or inadvertently energised, it means the contractor can work elsewhere in the building safe in the knowledge that only they can
restore the supply.
www.scolmore.com
Scolmore’s lockable fused main switches Working near live electrical systems and equipment in buildings has its own set of dangers, and the management of electrical safety – in particular, safe isolation procedures for low voltage installations – is of paramount importance if workers on site are to be protected from serious electrical injuries.
This potential problem can be compounded by the fact that main isolators are often fitted where the incoming supply is some distance from the consumer unit. It is possible that it will be out of sight of the contractor when he or she is at work. This introduces the possibility that someone else working on the project could inadvertently switch on the isolator without the contractor knowing and thus enhance the risk of electric shock – whatever they are working on could become live without warning. Scolmore’s new lockable fused main switches provide a simple solution to safe isolation. The
Powerstar MCCB Panelboards from Crabtree Crabtree’s Powerstar MCCB Panelboards are designed and manufactured in the UK, bringing Siemens technology, Crabtree reliability and ease of installation to the commercial and light industrial market sectors. Powerstar Panelboards are available in
PS125 or PS250 versions, with busbar ratings of 250A/400A and 400A/630A respectively. A switching unit or direct connection facility is supplied as standard on both variants of panelboard. The incoming switching unit function and rating range is decided by the use of interchangeable modules that provide both 125 and 250 boards with MCCB or switch disconnector functionality. Powerstar 125 is a TP&N system that
accommodates single pole or triple pole outgoing MCCBs rated between 15A and 125A. The Powerstar 250 version is supplied with a 3 or 4 pole incoming switching unit and allows triple pole MCCBs up to 250A to be fitted within the base unit. Add-on units allow additional 250A triple pole or 15A-125A single pole and triple pole outgoing devices. All Powerstar Panelboards utilise Siemens’
state-of-the-art circuit breaker technology, are RoHS compliant and are designed, tested and manufactured in the UK to BSEN/IEC 61439-2: 2009. To conform to the latest amendments to
the 17th Edition of the Wiring Regulations, a lightning and surge arrestor kit is available which can be fitted to the incomer.
www.electrium.co.uk/crabtree
Siemens powers up centre for the future Situated at the heart of London’s Green Enterprise District in the Royal Victoria Docks, near to the Olympic Park, the Crystal, a
sustainable cities initiative by Siemens, will be an iconic landmark demonstrating Siemens’ commitment to creating sustainable cities. The exciting new building will feature conference facilities, research space and an interactive exhibition. Integral to the building’s operations is a
bespoke power distribution board, the SIVACON S4, which has been designed in conjunction with Siemens solution partner, ICWPower in Sunderland, to suit the specific applications and requirements of the building. The first adaptation to the conventional
Siemens SIVACON S4 is a change in shape from a traditional straight distribution board to an ‘L’-shaped board. Working with the on-site contractors, the modification will ensure the board fits easily within the building, and that its constituent parts are accessible. The board is fitted with high-specification electronic switching air circuit and moulded case circuit breakers. These integral electronic protection units offer greater sensitivity and adjustability, and ensure the devices only trip and hence isolate the respective circuit they feed, in the unlikely event of a fault further downstream of the LV switchboard. In addition to this enhanced protection, the devices are monitored, and can be controlled remotely at a central control PC by the BEMS/Scada, via the auxiliary contacts and motorisation of the devices fitted within the two LV switchboards supplied by ICWPower.
www.siemens.co.uk/buildingtechnologies
March 2012 ECA Today 57
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