Replacing Mcb in cu

[Whittler1507]

Hi Newbie here hope this question is not too stupid,

I had a new CU fitted in to my garage workshop to put a 16 amp supply to my bandsaw.

This consisted of new cu with a single spur to the 16amp socket.

Said bandsaw has died and is to be replaced with another that needs to be on a 20 amp circuit. This is because of the current/amperage draw needed during start up and braking.

Which I think means replacing the Mcb with one rated for 20 amps.

The sockets are the blue bayonet type connectors which I think can take it, the cabling is 2.5mm which Runs from socket to cu a distance of approx 5m and think it can take it, am I correct in thinking that I can just get the Mcb replaced?

Also would this require another certificate/sign off?

Many thanks


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[davesparks]

I would generally prefer to see a 16A device on it but a 20A isn't actually prohibited. I think Guidance Note 1 may even mention the arrangement.

Usually it would only be done where the load profile is known.

It was specifically permitted to have a radial of multiple 16A outlets on a 20A mcb in the 16th edition, but that was removed when the 17th came out.

But even so it is multiple 16A sockets on a radial which can logically be protected by a 20A mcb, a single 16A socket has no logical reason for it