Henley block - fuse box - what wire etc

[militis]

Need help, I need to supply a 4th floor flat from a basement flat off the same meter, there is the main fuse then the meter.
I was going to put a henly block after the meter then straight up 4 floors to a fuse box, I think I need an RCD before it makes its journey up, don't know the cable I will need, just a bit lost in general would appreciate any advice.

 

[eddieboy]

So is the practice of wiring to phase colours still acceptable?

E.g if a lighting circuit is on L2 then all the line conductors would be black.

Or if it was on L3 then the lives would be gray.

 

[VoltzElectrical]

Make your mind up!

Earlier you said black taped blue, now you've said grey taped blue, and then grey taped blue and a second grey taped brown.
Which is it?



You are right that for single phase the only correct colour for live is brown, black and grey are not permitted and obviously neutral should be blue.

Sorry Dave, edited that now! All those colours got me confused!

 

[VoltzElectrical]

So is the practice of wiring to phase colours still acceptable?

E.g if a lighting circuit is on L2 then all the line conductors would be black.

Or if it was on L3 then the lives would be gray.

No, they would be on their single phase colours. If emergency switched then the permanent live would be the brown core, and the switched live, the black with some brown tape on it, and the neutral would be the grey with some blue tape on it. I think.