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Insulated Enclosures of Old and Earthing.

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Can anyone remember the I.E.E. Regulation applicable, and the era, and even the reg. number, when it was stated that in certain situations an all insulated fuse box was to be used as opposed to a metal one?


Thanks,


Z.
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    AJJewsbury:

    I don't recall any regulation specifically demanding an all-insuated fuse box (although it might have passed me by). It might have been implied by more general regulations though - e.g. the need to provide shock protection, ADS not being practical in some situations (say with high Ze) so obliging a double/reinforced insulation approach for TT systems and similar.


    There's been a reminder of that in the regs for a while - e.g. 531.4.1 in the 17th - which became 531.3.5.3.2.201 in the 18th - but neither really demand an all-insulated approach - as it has always been possible to have a double/reinforced insulation system within metal enclosures.


      - Andy.




    Thanks Andy, that is a good reminder. I am sure that I read about the need for all insulated distribution boards in the I.E.E. Regs. years ago on T.T. systems. What was a T.T. earthed system called before T.T? An installation with its own earth electrode and not supplied with an earth terminal from the distributor?


    Z.

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  • 0

    AJJewsbury:

    I don't recall any regulation specifically demanding an all-insuated fuse box (although it might have passed me by). It might have been implied by more general regulations though - e.g. the need to provide shock protection, ADS not being practical in some situations (say with high Ze) so obliging a double/reinforced insulation approach for TT systems and similar.


    There's been a reminder of that in the regs for a while - e.g. 531.4.1 in the 17th - which became 531.3.5.3.2.201 in the 18th - but neither really demand an all-insulated approach - as it has always been possible to have a double/reinforced insulation system within metal enclosures.


      - Andy.




    Thanks Andy, that is a good reminder. I am sure that I read about the need for all insulated distribution boards in the I.E.E. Regs. years ago on T.T. systems. What was a T.T. earthed system called before T.T? An installation with its own earth electrode and not supplied with an earth terminal from the distributor?


    Z.

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