Replacing Old Fuse with MCB

28 Apr 2008
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United Kingdom

My Cu is the old fuse wire type, I replaced the fuses with MCB (same rating) however 1 15 amp fuse keeps tripping. If I put back the old wired fuse it's OK. Can I up the 15 amp to a 20 amp MCB ( it's the main socks from the kitchen with dishwasher, washing machine, kettle etc)
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Details of OLD 15amp fuse and new MCB please, also is the circuit a radial or a ring? What is the potential total W to be drawn?
A real life example of the different operating curves of MCBs and rewirable fuses...
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I was thinking graphs an stuff BAS, JohnD are you sure you're not having a moment?

Poor fella lacks understanding of what he's doing ;)

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