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I was wondering why the removal of the time delay RCD would be necessary. It would provide some protection for the cable and and descrimination would be acheived between the RCD at the workshop.

I have a job to change out a consumer unit in a small workshop that is currently fed by a three core 10mm SWA cable. one conductor is earthed, as is the armouring at the supply end CU. The circuit is protected by a 40amp S type 100mA RCD and 32amp MCB on a PME supply. At the workshop end the...