Kitchen Radial Main

We have recently extended a kitchen and need to confirm the existing arrangements for the electrical supply are as they should be.

The kitchen is supplied by a radial main from the consumer unit via a 6mm cable originally connected to an electric cooker switch/socket, then via 2.5mm T&E to several double switched sockets, some with spurs to extractors, etc. The cooker switch, now redundant has been removed and replaced with another double socket. The kitchen has all the usual appliances, washing machine, dishwasher, tumble dryer, etc.

The main is protected by a 40A MCB at the consumer unit. Is this arrangement acceptable or should the MCB now be replaced with a 32A unit as fitted to the ring mains in the rest of the house as we have a gas cooker and do not need the higher rated supply anymore ?

I assume it is ok to leave the 6mm cable in place from the consumer unit to the first double socket on the main? It would be very difficult to replace this without lots of disruption? Advice is gratefully received.

A radial circuit cabled with 2.5mm2 conductors should be protected by a 20A device, not a 32A or a 40A device.

It's a poor design considering it's a kitchen and has the appliances connected as you mentioned.

There is a great risk of cable damage here...

40A MCB feeding 2.5 cable that can only carry 26A safely at best.

Add up the loads on that cable and you'll be surprised how much could be drawn at any one time.