No - may circuit's don't require c.p.c.s - SELV for example, or separated circuits feeding a single item.
Circuits (and indeed entire installations) that are entirely protected by double or reinforced insulation may have their c.p.c.s omitted - but only where the installation is under adequate supervision such that replacement of items with Class I equivalents cannot happen (so not domestics for instance) - in other situations a c.p.c. must be run to and terminated at each 'point' and 'accessory' (412.2.3.2).
A TT DB is an interesting one - I guess it could be argued that the TT earth is run to and terminated at the DB, so the requirement is satisfied - so as long as the supply cable itself need no Earthing (e.g. insulated & sheathed or singled in insulating conduit). I bet it'll confuse someone doing an EICR looking for a Zs value for the submain though....
No - may circuit's don't require c.p.c.s - SELV for example, or separated circuits feeding a single item.
Circuits (and indeed entire installations) that are entirely protected by double or reinforced insulation may have their c.p.c.s omitted - but only where the installation is under adequate supervision such that replacement of items with Class I equivalents cannot happen (so not domestics for instance) - in other situations a c.p.c. must be run to and terminated at each 'point' and 'accessory' (412.2.3.2).
A TT DB is an interesting one - I guess it could be argued that the TT earth is run to and terminated at the DB, so the requirement is satisfied - so as long as the supply cable itself need no Earthing (e.g. insulated & sheathed or singled in insulating conduit). I bet it'll confuse someone doing an EICR looking for a Zs value for the submain though....
