Serving London, Herts, Beds, Bucks & Essex
We install and upgrade mains and sub-mains distribution systems for residential developments, commercial premises, and industrial sites. Whether you’re powering a new building, expanding a site, or upgrading outdated infrastructure, our team ensures a safe and fully compliant system.
At Specialist Electrical Group, we design, install, and test complete distribution solutions, including cabling, containment, consumer units, distribution boards, and earthing. Every system is installed to current Wiring Regulations, ensuring capacity, safety, and ease of maintenance for years to come.
As a fully accredited contractor – certified by NICEIC, CHAS, MCS, SafeContractor, TrustMark, Constructionline Gold, RECC, Part P and PAS 2030 – we proudly partner with developers, housing associations, and facilities managers throughout the South East.
Call 0345 3 822 833 or enquire online to speak with our team or request a quote.
What are electrical mains?
The electrical supply coming from a power station to the building you are in is referred to as the mains. The current flows in one direction before switching to the opposite direction; this occurs continuously and is referred to as alternating current.
What are electrical sub-mains?
A sub-main is a branch of smaller electrical currents from the main supply. This is the source of power for your electrical appliances. All sub-mains are connected to the mains supply.
What is the purpose of mains and sub-mains?
The purpose of mains and sub-mains is simply to keep your home or business powered up. If a fault occurs in the mains current, all of the electricity in your home will be turned off; this could be caused by a simple power outage. If a fault occurred within a sub-main, you would notice an electrical appliance not working properly or at all. If this is the case, you should contact a local electrician to inspect the problem.
Mains and sub-mains at Specialist Electrical Group
Specialist Electrical Group has worked with local councils to replace hundreds of mains and sub-mains in residential buildings that needed to be upgraded. We have also installed mains and sub-mains in the many houses we have rewired. Our engineers leave the mains board tidy and neat so that if an issue arises in the future, the correct wiring is easily accessible.
