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Question for someone... recently inspected a 3phase 415v supply socket and noticed it's protected by a 40amp 30ma rccb... Income supply only has 3phases and earth and on socket side requires neutral... Surely this RCCB isn't doing it's job if the neutral is not fed through protective device? It'll just be acting as MCB with neutral from load and plug going no where? Looking for advice on fixing issue? Will I need to run neutral from busbar 20190212_221939.jpg or can i just replace with MCB and leave N?

Picture attached

Thanks
 
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