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    Will a combined MCB/RCD plug into most consumer units?

    ...or do they have to be the same make as the original CU? E.g. will a GE MCB/RCD fit my Proteus CU?
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    9v adaptor - does the mA figure matter?

    Hi I have a baby monitor where the 9v adaptor has just given up the ghost. On the adaptor it also says 300mA, but I don't know what that means. I have another 9v adaptor, but it says 600mA on it. Can I use this adaptor on the monitor, or would this be dangerous?
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    MCB on old Memera CU

    I am a complete novice, so please bear with me. We have an old Memera 3 CU and have recently had a new electric shower fitted (10.5 KW) and it keeps blowing the 30A fuse. So instead of replacing the fuse wire each time, I've just bought a 40A plug-in MCB from the local eletrical wholesaler. The...
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