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Power Installations: from first fix to test and inspection

Transcool Systems offers an extensive range of electrical services including LV Power Installations. In this blog we look at what is involved in the power installation process.

Design stage

A fundamental part of the design stage is the consultation between our designers and the client to help us decide on the most efficient and cost-effective electrical system.

From this initial consultation we are then able to assess, using the latest design software, which type of cables to use depending on the location, environmental conditions, the current demand and the client’s particular requirements. The containment sizing and type must also follow BS7671 regulations, sometimes referred to as the IET wiring regulations, to which all wiring in the UK must adhere.  The cable routes must be run in prescribed zones in order to achieve electrical separation – avoiding electrical interference with other services (such as security, safety and data).  PVC Dado trunking and plastic enclosures will often be most suitable for commercial office installations: a Dado trunking system allows cables to be distributed around various parts of an office and remain accessible, and usually comes with separate compartments for wiring, communications and data cables.   In contrast, industrial or public space applications call for heavy-duty galvanised equipment.  Underfloor wiring systems are also popular in office blocks where sockets and data points are fixed flush under each desk.


Once the designs are complete and signed off by the client, we can perform the initial fixing of the containment and switchgear.  The switchgear – the devices associated with controlling and protecting electrical equipment – are crucial for a safe and reliable electricity supply, and typically consist of distribution boards, switches and meters.

At the same time we install galvanised trunking and a conduit (a tube or duct protecting electrical wiring) for single cables and a ladder, or a tray and basket system for flex, SWA (steel wire armoured) and XLPE (cross-linked polyethylene) cables.

The termination of the cables and cores needs to comply with the BS7671 wiring regulations.  Cables and cores must also match the cable gland (the connecting device which secures the end of a cable to the equipment) and grommet (the ‘bumper’ lining the edge of a hole which minimises damage to cables from regular contact with other objects) and – most importantly – give suitable IP protection.  For ease of future maintenance, all our cables and cores are identified according to BS7671 and approved drawings.

Commissioning and testing

Finally, the new installation is inspected and tested to ensure it meets the necessary standards and is safe to use.  The measured values are recorded and an Electrical Installation Certificate issued to confirm that the work is BS7671 compliant.

If you would like to discuss the design of your proposed power system call the team at Transcool Systems on 01903 733911.