Hi can some one explain in simple English I have incoming main power cable 10mm to my 100amp fuse then to meter I'm adding aditional concumer unit to outbuilding with total appliances usage off 22kW electrician suggested 25mm armoured cable from Henley block running to outbuilding .Q how does this 10mm main incoming cable suport My house and addionall outbuilding witch will be on 25mm or do I need call power supplier to change main incoming cable ? Confuced.com little bit This similar layout of cables in my meter box View media item 55438