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The calcs and theory are where I am very weak. I'd never thought about a fuse acting "in either direction" - but have thought of it more like a safety valve - but I guess the same is true of that! So I probably ought to look out some good theory books to get to grips with that and the calcs - I...

Thanks to everyone and to ericmark - some good points. I haven't included everything in the post - I thought it was too long anyway! I started out proposing NOT to replace the consumer unit mostly because it's notifiable. However, having found a reputable Inspection and Test firm, I put them...

Thanks to both for your comments. I understand its not illegal for me to do most of the work. The question is, is it safe and how do I make sure its properly tested? Most electricians, understandably, won't certify installations they haven't completed. My post was partly in response to some...

1st, I am NOT a qualified electrician. But as well as finding lots of good advice here - I have come across some interesting debates when DIY'ers (like me) ask about how to do something. Sometimes in the process we amateurs demonstrate a really dangerous lack of knowledge - which is no doubt why...