OP
WilcoxElec
So what's this all about then?? Where's the harmonisation here?? ...lol!!
Cables cannot be buried into the structure of buildings - so ICT/ICTA tubing is used with runs of single conductors (H07) for the circuits. 2.5mm section for sockets 1.5 for lighting 6mm for cookers and hot plates and so on. For a new-build the tubing is prewired at a workshop and so you get junction boxes to go into the loft space with a number of ICTA tubes running off which are run down inside the walls - which we call an octopus (pieuvre) .... Hopefully the wires are all well labelled - but when you are making up runs yourself - if you have various coulours you can make life easier and faster. Most use violet and orange pairs for the wires which run between the two poles of two two way switches say, and black and brown for the returns from switches to lights or from push buttons to telerupteurs or whatever.... leaving red and blue to be used as the supply live and neutral.