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The hidden cost of net zero

Jon Steward
https://www.thegwpf.org/content/uploads/2020/07/Travers-Net-Zero-Distribution-Grid-Replacement.pdf?utm_source=CCNet+Newsletter&utm_campaign=85fbfa3557-EMAIL_CAMPAIGN_2020_07_16_12_54_COPY_01&utm_medium=email&utm_term=0_fe4b2f45ef-85fbfa3557-36405153&mc_cid=85fbfa3557&mc_eid=1127dc9b41


If you aren't aware, worth a read through.
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    However read what Hager have to say about their three phase distribution boards and decide if they can be used in a domestic property:


    Compliance with standards

    BS 7671 recognises equipment complying with an appropriate British Standard or Harmonised Standard without further qualification. This approach means that the person responsible for specifying the equipment must identify the appropriate standard.

    BS EN 60439-1 has been revised and restructured and the new standard for panelboards is BS EN 61439-2: Power switchgear and control gear assemblies.

    This new standard applies to assemblies mainly intended for industrial and commercial applications, where skilled or instructed persons will normally operate them. This does not however, exclude panelboards being located in an area accessible to ordinary persons.

    As a designer you will need to understand the Electricity at Work Regulations. This document places a duty of care on those who are responsible for the manufacture and selection of electrical equipment. You need to use verified designs to demonstrate compliance with the following two regulations:

    Regulations 4(1):

    ‘All systems shall at all times be of such construction as to prevent, so far as is reasonable practical, danger.’

    Regulations 5:

    ‘No electrical equipment shall be put into use where its strength and capability may be exceeded in such a way as may give rise to danger.’

    In short you must use an assembly that complies with the relevant safety standard. An ASTA recognised laboratory has tested and certified that the Hager Invicta panelboard is compliant to the new BS EN 61439-2 standard.

    https://www.hager.co.uk/files/download/0/3180_1/0/Guide_to_Commercial_Installations.pdf
  • 0
    I will say no.
  • 0
    As the front cover which I posted above clearly shows, BS EN 61439-3 applies to distribution boards intended to be operated by ordinary persons, so why mention BS EN 61439-2? ?
  • 0
    The Hager three phase boards comply with part 2, to be used in a domestic installation BS7671 requires consumer units to comply with part 3.


    It seems that the Hager boards can’t be used in a domestic property, unless Hager will confirm that they actually also comply with part 3 as well as part 2 or the designer of the installation records a non-compliance on the installation certificate.


    I am sure they may be perfectly safe in a domestic property, particularly as they are designed for higher fault currents.


    But what I am saying is that the possibility is that new build homes and those which are having a major refurbishment may well have three phase supplies installed to cope with EV charging and additional heating loads, so the manufacturers and wiring regulations committee need to address any issues there may be with selecting appropriate consumer units.


    Electricians will need to completely reconsider how they design new domestic installations and how they are adapting existing installations.


    Andy Betteridge
  • 0
    If you look at the current Hager catalogue, you will find three-phase boards certified to BS EN 61439-3. The same applies for other makes.

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