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Thanks again everyone. A good range of views but all constructive. This is what a good forum should have. I now understand why my sparks has opted for the standalone CU. The separate RCBO will "see" any earth leakage/imbalance only on the shower circuit and thus will trip without affecting...

Thank you everyone. I'm clear now as to the requirement. My CU has a 30mA RCD covering the busbar. The only issue is that it isn't a split-load CU, thus any tripping will take out the whole house. How often is that going to happen? As I see it , the only way that a 40A RCBO is going to...

Thanks ricicle. I assume that contactum RCBO will fit straight on the DIN rail. Will that trip before the main RCD ?

Hi, I have just had a quote from local spark for installation of new 9kW shower unit. He insists that he needs to supply / fit an additional "Shower CU" alongside my existing 12way consumer unit as I require an RCBO which cannot be fitted into my Contactum CU. My issue is that my CU has an 80A...