Data Installation & Supplies Ltd
Data Installation & Supplies Ltd
Data Installation & Supplies Ltd

Electrical and Power Cabling

Although you may not give too much consideration to your office’s small power infrastructure, it is probably the most important part of your working environment. Having adequate sockets outlets and correctly rated circuits for your workspace is critical to supporting your employees and the work that they’re carrying out. We rely on having a consistent electrical connection throughout the day, whether that’s for checking emails or just making a cup of tea, so issues with this provision can cause significant downtime for your business.

Ignoring the design of your electrical infrastructure’s precise load calculations and user requirements could potentially create more work down the line and compromise the safety of staff members and equipment. It’s imperative that you can provide your staff with the peace of mind that they’re working within a safe environment with connections they can rely on.

If you’d like our team of experts to inspect your current layout, or want advice for refurbishment or upcoming office move, don’t hesitate to get in touch with DIS today.

Choosing The Correct Cable


There are many different types of electrical or power cables available and our 18th edition trained account managers will be able to size and select the correct cables for your project. Whether you require a steel wire armoured cable for an external environment like a building site, or highly flexible cable that needs to navigate a winding maze to reach its destination, we’ll be able to recommend and supply the correct product for your needs. The following cables are just a tiny selection of the types that can be used within your project for optimal results.

Armoured Cable / Steel Wire Armoured

Steel wire armoured (SWA) cable is a robust cable frequently used for exterior wiring, where it can be buried directly in the soil, or suspended from a catenary wire. It consists of a number of individually insulated conductors covered next with flexible bedding, then by a spiral screen of galvanised steel wires, and finally by a tough outer sheath. The insulating materials used typically being PVC or XLPE thermosetting plastic (the latter having a higher temperature rating, hence allowing the cable to carry a larger maximum current for a given conductor size). PVC Sheathed version if to BS 6346, XLPE-sheathed version is to BS 5467, and the low smoke version is to BS 6724.

  • For outdoor & garden use.
  • Available in 2, 3, 4, & 5 core versions.
  • Must be terminated using the correct glands.

May use the steel wire armour for the circuit/CPC in place of, or in addition to a core.



  • Insulated single conductors
  • Standard cable for use in conduit
  • Typically used in domestic work only for main & equipotential bonding
  • Also available in both PVC (BS 6004) and low smoke (BS 7211) versions.

T & E

Twin & Earth cable. This is the most common cable used for domestic wiring today.

  • Also known as FTE (flat twin & earth)
  • Live and neutral are individually insulated, and the Circuit Protective Conductor (CPC) aka earth is bare
  • An overall sheath of grey PVC (BS 6004), or white for low smoke compound (BS 7211)
  • Not suitable for unprotected use outside (outer sheath materials are vulnerable to attack by UV; alkyd paint is enough to protect it from UV)
  • 1mm² 1.5mm² & 2.5mm² have solid (non-stranded) conductors
  • 4mm², 6mm², 10mm², 16mm² and higher have stranded conductors
  • 5mm² & 2.5mm² stranded T&E is available and legal to use but it is very unlikely to be seen in a domestic situation

What is an Electrical Cable?

Although we’ve talked about the different varieties of cable that we might use to power your premises, it’s important to understand the different components within the cable and how they all work together to transmit electricity from your generator or mains connection all the way to your device.

An electrical cable consists of four major parts:

  • Electric conductor
  • Insulation
  • Auxiliary elements
  • Outer sheath

The conductor is the key ingredient of a cable as it channels the flow of electricity from its source to its destination. There are many different types of conductor that can be used, including bare wire, copper or aluminium. Cables can also be single- or multi-core depending on how many conductors they feature.

Conductor insulation helps to prevent current leakage, preserve material integrity and stop conductors coming into contact with one another. Auxiliary elements further protect the cable and ensure that it is long-lasting.

The outer sheath holds all of these interior components together and protects them from external threats such as jagged surfaces, animals, trampling and more. This sheath can be made up of a variety of materials to ensure that it suits the purpose and environment that the cable will be used in.

Minimising Disruption

We understand how disruptive it can be to lose power during key moments of your business, and as such will ensure that any work is carried out at the best time for yourselves, potentially at night. Our experienced installers will work efficiently to carry out the work as quickly as possible, without compromising on quality.


Almost everyone and their premises require an electrical connection today, we’ve installed the infrastructure and circuitry for a vast range of industries. From small offices to large, multi-faceted installations for household names, DIS has helped to provide a high-quality solution for their requirements.

Refurbishment and checks

If your business is having issues with their current electrical installation, we’re happy to advise and see how we can help. Sometimes we may need to recommend a completely new solution, but we can also refurbish and replace your existing system to give it a much-needed boost. Get in touch today and see how we can help.

Request a quote here

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