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Discuss Would you core a 60 amp main switch been fed from a 100 amp BS1361 in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. mpb
    Offline

    mpb Active EF Member

    Location:
    Stafford
    I carried out a EICR and the main switch for the consumer unit is only rated at 60 amps and the main supply fuse is a BS1361 rated at 100 amps.

    Im thinking this should be a C2, what are your thoughts please.

    Many thanks

    Martin
     
  2. nickblake
    Offline

    nickblake Trusted Advisor

    How do you know it's 100 amps , very rare to get a domestic fuse at that rating normally 60 or 80 amps
     
  3. davesparks
    Offline

    davesparks Trusted Advisor

    Location:
    guildford
    What is the potential danger you have identified?
     
  4. mpb
    Offline

    mpb Active EF Member

    Location:
    Stafford
    It's a shop and I had to pull the fuse to change the main board and this board is Economy 7.
     
  5. HandySparks
    Offline

    HandySparks Trusted Advisor

    Location:
    Hampshire
    Business Name:
    Neish Electrical Services
    If it's E7, then it's likely to have a fixed load. What is the actual load?
     
  6. 7029 dave
    Offline

    7029 dave Trusted Advisor

    Location:
    bedfordshire
    If you have changed the board/ cu it will be 100amp anyway.?
     
  7. mpb
    Offline

    mpb Active EF Member

    Location:
    Stafford
    I was thinking the potential danger is the switching capacity isn't high enough in case of a fault.
     
  8. mpb
    Offline

    mpb Active EF Member

    Location:
    Stafford
    Haven't changed this board. I want to change it but need to discuss it with the owner but he doesn't like spending money.
     
  9. davesparks
    Offline

    davesparks Trusted Advisor

    Location:
    guildford
    That's not a danger, that is a fact about the inadequacy of the equipment.
    What situation can you imagine where the main switch will be required to break fault current?
    What is the total load on the board? Is it a fixed load or variable?
     
  10. davesparks
    Offline

    davesparks Trusted Advisor

    Location:
    guildford
    You want to change it? I hope that is just a lapse of concentration and not a serious comment!
     
  11. mpb
    Offline

    mpb Active EF Member

    Location:
    Stafford
    There a four 3kw storage heaters on this board. So a load of 52 amps been drawn.

    So the load is under the 60 amp rating of the main switch.
     
  12. 7029 dave
    Offline

    7029 dave Trusted Advisor

    Location:
    bedfordshire
    There are thousands of cu's out there with 60 amp dp switches backed by 100amp service fuse.
     
  13. telectrix
    Offline

    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    you can't do anything till you've assessed the load on this CU. get the clamp meter out at midnight.
     
  14. mpb
    Offline

    mpb Active EF Member

    Location:
    Stafford
    So I should code it as a C3 improvement recommended.
     
  15. davesparks
    Offline

    davesparks Trusted Advisor

    Location:
    guildford
    That doesn't necessarily make it right though. There are thousands of 3036 CUs with a bit of 2.5 in place of the fusewire too.
     
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