At Hexo Electrical Testing we offer a complete Distribution Board replacement service to our commercial clients. 

Please see here for our domestic consumer unit replacement service.

What is a distribution board?

A distribution board is usually found in commercial or industrial premises and in most cases has an incoming three-phase electricity supply and outgoing three phase or single-phase circuits that are protected by MCBs or RCBOs.

The purpose of a distribution board is to safely segregate the incoming supply into separate electrical circuits and provide circuit protection so that in the event of a fault the protective device will trip to isolate the circuit.

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    Jennie Barham
    Jennie Barham
    5. January, 2022.
    Very helpful and easy to work with, we needed to make several repairs to improve our EICR report and they explained everything on the report and what they'd do, and scheduled in the work quickly. The electrician was friendly, professional and left the house in excellent condition.
    Natalie Hill
    Natalie Hill
    21. December, 2021.
    Really responsive and flexible to fit in a job that we needed doing at incredibly short notice (same day!) Proactive, communicative, professional and really helpful. Really clear and easy to understand pricing, and the online invoicing system was a total dream (which is definitely not always the case!) and allowed me to quickly pay invoices while I was running today and so meant I didn’t hold anything up. The whole service today was outstanding - thank you.
    Heather Heber Percy
    Heather Heber Percy
    19. December, 2021.
    Right from the beginning with the first phonecall to the completion of all work necessary for an electrical certificate, they were professional and courteous. It wasn't cheap but I paid for a quality service which seems to be a rarity in today's world. Well done Hexo
    Genghis Borkwood
    Genghis Borkwood
    28. July, 2021.
    Big shout at to Robert Gough at Hexa services he got me a great job. Got me a job for life.
    Katie Wimpenny
    Katie Wimpenny
    16. March, 2021.
    I had a fantastic experience with Hexo. They responded very quickly to my enquiry email and followed up with an email. They then had an engineer with me by the same afternoon. The two men I dealt with were so incredibly friendly, helpful, reassuring and informative. I intend to use them again in future. Highly recommend.
    Noel Wilson
    Noel Wilson
    12. March, 2021.
    inspected my property,,very happy with the engineer,very thorough,,thanyou
    Murat Nuriyev
    Murat Nuriyev
    10. March, 2021.
    Nice service. Very responsive and helpful staff. Will use them again.
    Swaran Dhaliwal
    Swaran Dhaliwal
    7. March, 2021.
    I enquired about the EIDR check and was given a fix price. They arranged appointment with my tenant and fixed the date They attended at the appointed date and completed the test. Job well done. I will definitely use then again as the price was reasonable too
    Kate Cordell
    Kate Cordell
    2. March, 2021.
    I needed an urgent EICR for my rental property and Hexo stepped in when I was let down by my usual supplier. They gave me a good quote, that they stuck to - no unexpected extras unlike some, turned up on time and stayed in touch. I needed some subsequent work done and again, great communication, a fair quote and the work was done on time and to a great standard. Would recommend and will use again.

    What is the difference between a consumer unit and a distribution board?

    Often, the terms distribution board and consumer unit are used interchangeably. However, while consumer units are a type of distribution board, not all distribution boards are consumer units.

    Typically, a consumer unit is found in domestic properties, whereas a distribution board is found in commercial and industrial premises. A distribution board usually has a three-phase incoming electrical supply whereas a consumer unit always has a single-phase incoming supply.

    Distribution boards are capable of handling more load than a consumer unit.

    What regulations apply to distribution boards?

    As an employer you need to comply with the Electricity at Work Regulations 1989, and part of this compliance is having a safe fixed electrical system for your staff and visitors to use.

    Distribution boards are subject to wear and tear from maintenance and electrical loads, and over the years electrical regulations change, and so there comes a time when they naturally require replacement. 

    We have a legal (and moral) obligation when installing your distribution board to ensure that all the circuits that are connected to it are safe, and that the main distribution and earthing are satisfactory. 

    What’s the process and requirements involved?

    The recommended first step is for us to perform a Commercial EICR (Electrical Installation Condition Report) on the distribution board, or the entire installation if you wish. 

    This will enable us to detect any faults with the final circuits or issues around the main particulars of the installation that would need rectifying for us to be able to install your new distribution board.

    By undertaking the EICR first we can give you a full and clear picture of all costs involved at the outset.

    What standards must a distribution board meet?

    For us to be able to install your new distribution board the minimum required standard for the existing installation is:

    • The rating and condition of any existing equipment, including that of the distributor, are adequate.
    • The earthing and bonding arrangements necessary for the safety of the alteration are adequate.
    • The main earthing terminal of the installation is connected to an adequate means of earthing via a suitably sized earthing conductor.
    • The main protective bonding is adequate.
    • The meter tails and the distributor’s equipment have adequate current-carrying capacity.
    • The polarity of the incoming supply is correct.
    • Only final circuits that do not have any C1 or C2 defects can be connected to the new distribution board.
    • Rubber or lead cables may not be able to be reconnected to the new distribution board.
    • The distribution circuit that supplies the distribution board is adequate and has the correct overcurrent protection.

    How much does a new distribution board cost?

    The price for a replacement commercial distribution board really does vary significantly depending upon how many final circuits there are and how many RCBO devices are to be installed. 

    A small three phase distribution board with minimal RCBO protection can start at around £900+VAT but for much larger distribution boards with more RCBO protection this can increase to over £3,500+VAT.

    If you would like a quotation for a new distribution board, please request a quote and we will provide you with a fixed price.

    Do I need an EICR before replacing a distribution board?

    It is strongly recommended that an EICR is carried out before your distribution board is replaced so that we can highlight any defects with the existing installation in advance. 

    If you have a site with multiple distribution boards, we can carry out an EICR on only the DB that you would like replacing, or the whole site, as you wish.

    What if I don’t want an EICR first?

    If you don’t want an EICR first, then instead we are able to carry out a pre-work survey. During this survey we will just check the items that would prevent us from installing the new distribution board itself and we will not check all the final circuits. 

    If when we carry out the installation, we find that there are C1 or C2 defects on the existing circuits, then at that point additional charges would need to be agreed to rectify these, or the new circuits would not be connected to the distribution board. 

    The charge for a commercial pre-work visit is £90+VAT. Please contact us if you would like to arrange one.

    Why replace a distribution board?

    There are a variety of reasons why you may wish to replace your distribution board such as:

    • To accommodate additional load.
    • So that RCD protection can be incorporated.
    • The existing distribution board has been damaged or overloaded.
    • To upgrade from rewireable fuses to MCBs and RCBOs.
    • To enable a Satisfactory EICR.

    What distribution board options are there?

    All distribution board types that we install are fully compliant with BS7671: 18th edition Amendment 2 and the brands we usually fit are either Schneider or Eaton MEM.

    We can incorporate RCD protection into the new distribution board for just all required circuits, or all recommended circuits as well, and leave enough spare capacity for any future additions.

    Which old distribution boards should be replaced?

    Typically, distribution boards that will require replacement are those that cannot incorporate RCD protection or obtain parts for, or those that are damaged or overloaded. A distribution board replacement may be a requirement to obtain a Satisfactory EICR.

    How long does it take to install a new distribution board and is there any down time?

    The time it takes to install a new distribution board varies significantly based on how many circuits there are to connect into it and the type of cabling the circuits are, for example SWA, or twin and earth. 

    Other factors to consider are the distribution board wiring system and whether trunking will need to be adjusted or installed to accommodate the new distribution board. 

    A small straightforward distribution board could be changed in 4 hours, whereas a larger distribution board could take one day. Some more complex installations may require 2 days or more.

    Do you need to turn off the power to replace a distribution board?

    To replace the distribution board, we need to isolate the power supply to it, so all circuits supplied by the DB will be off while we carry out the replacement.

    How to order a new distribution board?

    Decide if you want either an EICR or a pre-work survey and then contact us to make your booking.  We will then attend the site and conduct the visit and provide you with a quotation for the distribution board replacement.

    If you are unsure or have any questions, then please contact us and we will be happy to help. 

    We can give you an indicative price initially if you can provide images, please email these to us.

    0207 315 4151

    To find out more about hiring us to be your Electrical Testing Provider get in touch with us by emailing, or calling 0207 315 4151. You can also make a booking here.