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c2 c3

tonydon

Hi All

A scenario …

Commercial building

Metalclad distribution board (memshield 2)

Sockets on rcbo's

Lighting on MCB

On a condition report obviously the lighting circuit does not meet the 18th edition

(cable buried less than 50mm)

But,  the regs themselves say you cannot fail a test due to the regs not being currently,met if they would have met the previous edition

And, how can this then not be a C2?  and how could pretty much every old board not fail?

 

Ok…

What I am really asking is..

On an EICR  How can I pass a test when the cables are not buried less than 50mm on an otherwise good installation??? But not Not rcd protected

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  • 0

    But,  the regs themselves say you cannot fail a test due to the regs not being currently,met if they would have met the previous edition

    I don't think my copy says that..

    And, how can this then not be a C2?  and how could pretty much every old board not fail?

    As a first approximation:

    C1 = Lack of any protection - dangerous now (e.g. exposed live conductors)

    C2 = Lack of fault protection - dangerous if just one more thing goes wrong - broken/missing c.p.c.s - protective devices that wouldn't open under earth faults (high Zs or broken RCD on a TT system) - that sort of thing

    C3 = Lack of additional (supplementary) protection - e.g. 30mA RCDs to sockets serving only indoors or bathroom circuits where supplementary bonding is present.

    In some situations - e.g. bathrooms - ordinary ADS alone isn't considered sufficient for proper fault protection - so C3 might get elevated to a C2 if there's a complete lack of additional protection (RCDs or supp bonding) there.

    So my starting point would be a C3 for lack of additional protection on a lighting circuit that's not running through a special location.

        - Andy.

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  • 0

    But,  the regs themselves say you cannot fail a test due to the regs not being currently,met if they would have met the previous edition

    I don't think my copy says that..

    And, how can this then not be a C2?  and how could pretty much every old board not fail?

    As a first approximation:

    C1 = Lack of any protection - dangerous now (e.g. exposed live conductors)

    C2 = Lack of fault protection - dangerous if just one more thing goes wrong - broken/missing c.p.c.s - protective devices that wouldn't open under earth faults (high Zs or broken RCD on a TT system) - that sort of thing

    C3 = Lack of additional (supplementary) protection - e.g. 30mA RCDs to sockets serving only indoors or bathroom circuits where supplementary bonding is present.

    In some situations - e.g. bathrooms - ordinary ADS alone isn't considered sufficient for proper fault protection - so C3 might get elevated to a C2 if there's a complete lack of additional protection (RCDs or supp bonding) there.

    So my starting point would be a C3 for lack of additional protection on a lighting circuit that's not running through a special location.

        - Andy.

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