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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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    they would not be suitable for isolation, as the buttons cannot be secured.

    Aren't isolation and locking off two separate requirements? Locking off is only needed if the device is remote from the equipment needing to be isolated, and if needed, may be provided by means other than on the isolating device itself - e.g. in a lockable enclosure.

       - Andy.

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    they would not be suitable for isolation, as the buttons cannot be secured.

    Aren't isolation and locking off two separate requirements? Locking off is only needed if the device is remote from the equipment needing to be isolated, and if needed, may be provided by means other than on the isolating device itself - e.g. in a lockable enclosure.

       - Andy.

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