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only need an RCD device if you are supplying the equipment through a socket. Otherwise it's just a triple pole mcb and neutral isn't switched.well doesn't that circuit need to be protected like all the other circuits which are all rcbos so I thought it would be best for this to be a rcbo instead of a 3P+N MCB with a RCD. But am I right to use a 3P+N breaker for 3 phase though ?