WE recently wired a shed coming from the consumer unit in the persons house using 3 core 6 sq swa.My question is my boss said put it on an mcb at the main consumer unit and the sub board in the shed has an rcd in it.Is it alright to supply the shed through an mcb.Cable was clipped to outside wall exposed to the elements.In case your wondering there was no power tools or heavy loads in the shed