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Class 2 CT chamber

lyledunn

New Form 4 switchboard but DNO want confirmation that the integral CT chamber is of Class 2 construction as per BS7671. No specific Reg given. It is not something that I have been challenged on before but I can only see some loose implication in 557.5.3.1 indent (iii). 

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    Sounds odd - unless of course it's a TT installation (or someone at the DNO thinks it is).

    557.5.3.1 indent (iii)

    I read that as none of the live conductors of the secondary circuit should be deliberately earthed - like a separated circuit  - that doesn't imply to me that section 412 must apply.

       - Andy.

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    Sounds odd - unless of course it's a TT installation (or someone at the DNO thinks it is).

    557.5.3.1 indent (iii)

    I read that as none of the live conductors of the secondary circuit should be deliberately earthed - like a separated circuit  - that doesn't imply to me that section 412 must apply.

       - Andy.

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