Sub Mains and Switch Fuses …

Image: Balham SW12 emergency electrician fixing a commercial electrical installation.

Sub Mains Installation Services

We specialise in the design, installation and commissioning of mains and sub mains distribution systems in a wide diversity of situations. Our mains network engineers are fully qualified and experienced in sub mains installation for all types of building – residential blocks, hospitals and medical centres, HMOs, blocks of flats, commercial kitchens, hotels, education centres, factories and offices.

We install and maintain both large and small scale distribution systems. Our engineers carry out all of your installation including cable management and containment to the distribution boards and switch panels. You benefit from a coherent and robust system with no waiting around for sub-contractors to complete their work.

Call us on 07956 523316 at any time. You will speak directly to an experienced electrician and not a receptionist. You benefit from less time wasted waiting for a call back and your London sub-mains distribution system will be up and running in no time!

Mains Distribution Systems and Mains Failure

Mains distribution systems vary from simple e.g a sub main supply for a garage, up to large London commercial or industrial projects requiring a reliable meshed system.

The simplest mains distribution network is referred to as a radial system. It is the cheapest and easiest to install. It’s down-side is that multiple users are affected by a mains failure fault, so it is only really practical on small applications where a mains power outage would not be critical. For example, in a hospital, a fault on a radial system would mean several areas would suffer a power outage. This can put lives at risk so a more ‘compartmentalised’ system would be needed.

One such system uses parallel feeders. This gives a greater reliability, however, since it is more complex, it is more expensive to install. Where the highest levels of reliability are required, the extra expenditure is essential.

Where costs justify the need, networks include built-in redundancy to make sure that there is always a route for the electricity, making them highly reliable.

New Switch Fuses

Sometimes, a power outage will be caused by the switch fuse. In commercial and industrial situations, this is usually connected to a 415 volt supply and needs a professional commercial electrician to investigate and repair the problem.

A domestic electrician is not used to working with three phase or high voltage mains supplies. We have over 25 years of experience in the field and out engineers are well-versed in with industrial high-voltage and three phase installations.

Where your switch fuse needs replacing, we will use the highest quality components for your budget e.g. the renowned Wylex switch fuse. These come with the standard values of fuse link and are made from steel in order to withstand the rigours of life in an industrial unit or factory.

Call us on 07956 523316 at any time. You will speak directly to an experienced electrician and not a receptionist. The benefit to yourself is that it wastes less time since you don’t need to wait for a call back and your London sub mains distribution system and switch fuse will be back up and running a lot faster.

So why delay, to benefit from competitive rates and an efficient customer-centred service, call South London Electricians on 07956 523316 for a no-obligation chat about how your South London home or business could benefit from our domestic, industrial and commercial electrical services.

Our team of experienced and fully qualified electricians are available to solve your electrical issues in the south east from Central London to the Home Counties. We are based in Croydon, which puts us in easy reach of many Croydon Borough areas:

South Croydon
Hamsey Green

Along with this, we have customers in:

Thornton Heath

In the Surrey area we regularly provide electricians for commercial, industrial and public sector customers in


Call us on 07956 523316 at any time. All our work is guaranteed and as required by law, we hold public liability insurance giving you peace of mind.

We pride ourselves on completing all work to the highest standards without fuss, with minimum disruption and leave the premises as tidy as when we started the job.

In addition to our commercial services, we also carry out electrical wiring and rewires, fuse and circuit breaker installation and replacement, CCTV installation, electrical inspection and testing, Landlord electrical certificates, PAT testing and much more. Call our friendly and professional team on 07956 523316 – we will be happy to discuss your specific requirements and offer free, no obligation estimates.

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