I have a bungalow which has all the wiring in the loft in metal conduit. I want to replace some of the wiring and conduit with T&E but it is not possible at the moment to replace the conduit and wiring dropping down to the skts and light swithes. Is it permissable fix a suitably rated connection box adjacent to the vertical conduit drop and connect the single cables from the conduit into it. If so, what is the max length the singles can be left unprotected.