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Have been to a farm today that has a 100mA time delayed RCD main switch covering a DB that has MCB’s on majority of circuits ( less than 32A) and 30mA RCBO’s on sockets, lighting etc.
What I was thinking was does this comply with regs as circuits less than 32A should disconnect in less than 0.2s so because time delayed rcd fitted the circuits just on MCB’s don’t comply.
I thought to comply the RCD must trip within 200mS and before voltage rises above 50v.
Am I correct or am I being daft ( not for the first time )😕

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