Electrics RCD Question

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The OP's RCD is rated at 80A, it is significantly lower than the max of the MCBs (114A).

It doesn't work like that.

It is highly unlikely, and in an ordinary domestic house pretty well impossible, that all the circuits would be carrying their maximum rated load at the same time.

An electric shower, and an immersion heater, may run at nearly their rated circuit load. Pretty well nothing else comes close.
 

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