focusv8 provided a link with a photo which is a split load unit, that is lighting to the left(not RCD controlled) and sockets to the right(RCD controlled). my point was NOT to put the sockets through the MCB's on the left as they wouldn't have RCD protection. Stephenc, of course the cable can handle more than the milliamp rating, its the main current carrying capacity its rated for eg.10A 20A etc. the milliamp rating, usually 30mA, is the amount of earth leakage current allowed b4 tripping of the device. Any higher earth leakage could be fatal. RCD's dont have any overload or short circuit protection, only earth leakage protection. RCBO's have all 3. Any RCBO or MCB is there to protect the cable, not any appliance connected down the line. What good would a 20A MCB, for example, be at protecting something that can only handle an amp or 2 of current without burning out. Like take a playstation or something takes what 150w? if something happens in it and it takes more juice than normal its the fuse that'll blow for protection to the unit. yes if theres a major fault obvisouly the MCB will go and protect it that way, but the fuse in the unit is suppose to protect that individual appliance.