Sockets rated up to 32 Amps in an electrical installation require additional protection by an RCD rated at 30mA or less. Fitting an RCBO which is a combination of MCB and RCD, at the distribution board is an easy way to achieve this. RCBOs are widely available for single-phase installations, but finding a three-phase RCBO requires a bit more effort. Hager produces a handy RCBO conversion kit which means almost any three-phase MCB can be converted to an RCD).

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