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an mccb main switch then mcb's or mccb's feeding sub boards.
when the shower/sockets/lights trip it doesnt trip every other mcb does it, same thing
No it's not the same thing, you suggested installing a DB and feeding sub mains from MCBs in that DB.
That puts the final circuit MCBs on series with the distribution circuit MCB, this will may not discriminate in the event of a fault on the final circuit.