Sub Mains Installation
Essex
- Free quotes
- Qualified electricians
- Installation, testing & certification
Sub-main cables, distribution boards and three-phase supplies for offices, retail units and warehouses across Essex and Suffolk. Designed, installed, tested and certified by qualified electricians, and planned around your business.
Sub-Mains, Distribution Boards and Three-Phase Supplies
Whether you're fitting out a new unit, adding a floor or extension, or bringing in new equipment, we design and install the power distribution to suit.
Sub-Main Cables
Armoured cable runs between your main switchboard and remote distribution boards, between floors or to separate buildings, sized for the load and run safely.
Distribution Boards
New and replacement distribution boards, including three-phase boards and RCBO boards, with clear labelling and up-to-date circuit schedules.
Three-Phase Supplies
Three-phase circuits and supplies for machinery, commercial kitchens, HVAC plant and EV chargers, with load assessment to make sure your supply can cope.
Switchgear & Isolation
Main switches, isolators and switch-fuses installed or upgraded so each area and item of plant can be isolated safely for maintenance.
Cable Containment
Cable tray, ladder, basket and trunking installed to carry new sub-mains neatly and safely, with room for future expansion.
Testing & Certification
Full testing on completion, with an Electrical Installation Certificate, distribution board schedules and as-fitted information for your records.
Offices, Retail Units and Warehouses
Offices
New distribution for fit-outs, extra floors and server rooms, with shutdowns planned out of hours so your team can keep working.
Retail Units
Sub-mains and boards for shop fit-outs, refits and unit splits, scheduled around trading hours and landlord requirements.
Warehouses & Industrial
Long sub-main runs, three-phase supplies for machinery, racking areas and loading bays, and distribution for mezzanines and new plant.
From Survey to Certificate
Survey & load assessment
We look at your existing supply, switchgear and the loads you need to power, now and in the future.
Design & free quote
Cable sizing, protection and routes agreed, with a clear written quote and programme.
Installation
Planned shutdowns around your operations, with safe isolation and a tidy site throughout.
Testing & handover
Full testing, an Electrical Installation Certificate and updated board schedules.
Why Businesses Choose Us
Across Essex and Suffolk
From our Colchester head office we cover commercial premises across Essex and Suffolk, including:
Tell Us About Your Project
Send us a few details about the building and what you need to power, and we'll arrange a survey and give you a free, clear written quote.
- 1Share the detailsBuilding type, location, and the equipment or areas you need to supply.
- 2We survey and quoteWe assess your supply and give you a written price and programme.
- 3Installed and certifiedWork completed around your operations, tested and certified.
You May Also Need
Planning a Sub-Main or Board Upgrade?
Talk to our Colchester team about your project, or send the details for a free, no-obligation quote.
Frequently Asked
Questions
A sub-main is a cable that carries power from your main switchboard or incoming supply to a separate distribution board, for example on another floor, in another part of a warehouse or in a separate building. It lets each area have its own protected circuits while being fed from one supply.
Three-phase power is usually needed for larger loads such as machinery, commercial kitchens, large HVAC plant and multiple EV chargers. We'll assess your current and planned loads and advise whether three-phase is needed, and whether your existing supply has the capacity.
Yes. Sub-main and distribution board work often needs the power off, so we plan shutdowns around your operations and can work early, late or at weekends to keep disruption to a minimum.
Yes. Every installation is tested and certified to BS 7671, the IET Wiring Regulations, and you'll receive an Electrical Installation Certificate along with updated distribution board schedules.
Where a new or upgraded supply is needed, we'll help you prepare the application and liaise with your network operator. Work on the network side of the meter is carried out by the network operator or its approved contractors.
Yes. We'll survey the site, discuss your requirements and give you a free, clear written quote before any work starts.
We install sub-mains, distribution boards and three-phase supplies for offices, retail units and warehouses across Essex and Suffolk, from our Colchester head office.