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Using BS3871 MCB to protect ne submain

Alan B

Is it ok to connect a new submain to an existing spare 3 phase BS3871 MCB in a light industrial installation. The alternative is to change the entire main DB.

Submain will be clipped direct to wall and steel roof beam. It will feed a new 3 phase DB, probably equipped with two 3 phase 16A MCB's.

My understanding is that BS 60898 replaced BS3871 and the standards are similar, I am sure there are some differences, but do they make a significant impact on safety? In my mind providing they disconnect in the required time everything should be acceptable? Main risks will be after the sub board using modern devices.

Thanks

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    Well, the EIC and MEIWC require you to certify that the installation conforms to the stated version of BS 7671.

    Well, not the entire installation, just what's been installed within the scope of the certificate - i.e. the new work. In the OP's case it could be said he's extending a circuit from an existing OPD - so the new work commences at the outgoing terminals of the BS 3871 and so the MCB itself isn't included in what's being certified. So as long as it's "adequate for the altered circumstances"...

       - Andy.

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  • 0

    Well, the EIC and MEIWC require you to certify that the installation conforms to the stated version of BS 7671.

    Well, not the entire installation, just what's been installed within the scope of the certificate - i.e. the new work. In the OP's case it could be said he's extending a circuit from an existing OPD - so the new work commences at the outgoing terminals of the BS 3871 and so the MCB itself isn't included in what's being certified. So as long as it's "adequate for the altered circumstances"...

       - Andy.

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