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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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    So long as you can show it meets the current  requirements of BS 7671 in terms of breaking times under fault and overload as applicable, and the wiring method is acceptable for the location (and SWA and pvc singles inside earthed containment probably will be) you can use any suitable breaker. This may well be perfectly  suitable. The fact that the standard was withdrawn in July 1994 does not in itself preclude using  devices specced to it.

    Mike.

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  • 0

    So long as you can show it meets the current  requirements of BS 7671 in terms of breaking times under fault and overload as applicable, and the wiring method is acceptable for the location (and SWA and pvc singles inside earthed containment probably will be) you can use any suitable breaker. This may well be perfectly  suitable. The fact that the standard was withdrawn in July 1994 does not in itself preclude using  devices specced to it.

    Mike.

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