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The RCCB trips when the shower unit is switched off, not when the isolator is switched off. The circuit is cu to isolator in one 9m run and 1.5m run from isolator to shower unit and all 3 sets of connections have been physically checked and tightened. As I did have very occasional ( 1 in...

Had a split load cu fitted last year and had the sparky connect my 9.5Kw shower to a 40A mcb protected along with the ring circuits by a Siemens 80A RCCB. The 10mm cable run is about 9m...totally free the whole run as I've not decorated the middle floor room it runs through. A few months ago I...