A quickie for you 16th Edition Guru's:

I'm installing some wiring in our (covered) outside
passage/outbuildings viz:- an extension to the downstairs ring, (not a
spur), and additionally a spur from the downstairs lighting circuit.
The wiring from the house passes through the wall of the house, and I
then intend to connect Hi-Tuf cable for the wiring in the passage
within an adaptable box or something similar. Obviously the phase and
neutral conductors for the three t&e's must remain separate in order
to be a conventional ring and a separate lighting circuit. My
question is though, is it acceptable to join together all 3 CPC's
within the adaptable box?