best way to do it?

[GPack]

A quick question.

If I used an MCB at the main board, SWA to the cabin board which was RCD protected, is it true that I would need a double pole switch (2modules), and RCD (2 modules) and 2 MCBs for lighting and power (2modules)? I don't think you can do away with the d/p switch can you? reg no. if possible would be
helpful when answering this one.
Or just a D/P switch and 2 RCBOs (4 modules)

 

[davelerave]

sure ya i would use the 6sq for Zs and Vd as well as capacity

as price difference is small

3amp is small for any final circuit-you would certainly be risking nuisance with incandescents anyhow

The final circuit ocpd protects the conductor- design current may be small but mcb can be bigger than 3amp as cable is still protected

If light fitting needs protection it should have an internal fuse fitted