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This is an inherent problem in having loads of circuits on the same RCD. Many years ago RCBOs (breakers with both overcurrent and earth leakage protection built into a single device) were too expensive so either the whole house was put on one or the house was split int two with half the circuits on one RCD and half on the other. Nowadays RCBOs are cheap enough that there is only need for separate RCDs if you are exercising extraordinary economic restraint.
But still likely to find older installs that have a separate RCD. Or worse yet that have no RCD protection at all.
 
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