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3036 question

Discussion in 'Electrics UK' started by PrenticeBoyofDerry, 9 Jul 2016.

  1. PrenticeBoyofDerry

    PrenticeBoyofDerry

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    What device designation would be expected on mains supply service fuse, BS3060 rated at 30A. S1A, S2A or S3A?
    I am tempted to believe it is S2A but is it?
     
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  3. Adam_151

    Adam_151

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    Unless it actually says otherwise you can only assume S1a. Though as you say I'd reckon its going to to be probably S2a in reality as the Wylex standards and MEM 20A devices are S2a and they are much shorter.

    There is no S3a. It cannot be S4a as this cannot apply to devices below 60A.

    I'd not worry too much about what exactly it is. I'd just try and persuade the DNO to change it out. It must be at least 50 years old, and potentially a lot more than that. If its got a fused neutral they should change it as a priority job, if its not then there might be a few weeks wait
     
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  4. PrenticeBoyofDerry

    PrenticeBoyofDerry

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    I have recommended to the customer that the use be swapped out by the DNO. The neutral has been linked rather than fused.
    Thank you for you input.
     
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