If the circuits are never going to be unplugged again to reposition partitions or make other alterations is there really any advantage over running in a forty metre distribution circuit to another distribution board?


If you look in the text books by Brian Scaddan and others you will see examples of cable calculations where you end up needing 16 mm twin and earth to supply a 3 kW immersion heater, because of correction factors. In reality you use a smaller cable and route it differently along with other tweaks.


I changed a consumer unit in a two up, two down house. The full tally was living room, kitchen, bathroom, cellar and two bedrooms, the installation has a sixty amp main fuse and five 32 amp socket ring circuits spread across five rooms, where there had originally been one socket ring for the whole house, given that the customer had bought a dual RCD consumer unit for me to install the five circuits were split between two RCDs, two circuits would have been perfectly sufficient.


There comes a point where there generally ceases to be any advantage whatsoever in having additional circuits, in your installation it sounds like a socket circuit on each phase will do the trick, reducing the number of circuits from nine to three, in turn reducing the number of conductors in the home run significantly, even more so if it becomes a three phase distribution circuit to a distribution board.

If the circuits are never going to be unplugged again to reposition partitions or make other alterations is there really any advantage over running in a forty metre distribution circuit to another distribution board?


If you look in the text books by Brian Scaddan and others you will see examples of cable calculations where you end up needing 16 mm twin and earth to supply a 3 kW immersion heater, because of correction factors. In reality you use a smaller cable and route it differently along with other tweaks.


I changed a consumer unit in a two up, two down house. The full tally was living room, kitchen, bathroom, cellar and two bedrooms, the installation has a sixty amp main fuse and five 32 amp socket ring circuits spread across five rooms, where there had originally been one socket ring for the whole house, given that the customer had bought a dual RCD consumer unit for me to install the five circuits were split between two RCDs, two circuits would have been perfectly sufficient.


There comes a point where there generally ceases to be any advantage whatsoever in having additional circuits, in your installation it sounds like a socket circuit on each phase will do the trick, reducing the number of circuits from nine to three, in turn reducing the number of conductors in the home run significantly, even more so if it becomes a three phase distribution circuit to a distribution board.