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As you state the RCD is 100mA, It may be prudent and compliant to remove and change with one with a 100A\30mA rating, Then if the New RCD\RCCB Keeps tripping then try to leave off one circuit at a time, but remember you could have a combined earth leakage on say 2 or 3 or 4 combined circuits...

you could go with installing a New MC Small Consumer unit [8 OR 10way] with a 200A DP Main Switch and Install 2 x 63A DP mcb's - one per Apartment I suggest using a 6mm 3 core Armoured cable running from the New Board to the Apartment Consumer Units This is much neater but depends upon the...

Simples, get yourself a PP3 Battery [oblong flat battery used in Test Meters] and connect one terminal to all the Black wires and then take any Single Red wire and connect to the other terminal, you are now good to go. Now with any simple test meter set your meter to detect D.C. Voltage and go...