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Proposing to install new main fuse box with a trip switch.

My house is about 20 years old. I have been informed that the main fuse box proposed does the following function.

If the 13 amp power fails, due to electric kettle. Then the switch will trip.
All 13amp power connects will be shut down, however the house lights will remain on. Could you kindly advise what is the best type.

Hi Ralph, from your discription it would seem what is proposed is a 'split-load' consumer unit with RCD for socket half of board & main sw. for lighting circuits ect.
I am sure the registered 'part-p' leckie you use to do this 'controlled work' for you will know all about it!
IE this is not legal DIY work, see 'projects' section
SPARX