Power Sockets ~ in new domestic electrical installations the ring
final circuit is usually employed instead of the older obsolete radial
system where socket outlets are on individual fused circuits with
unfused round pin plugs. Ring circuits consist of a fuse or miniature
circuit breaker protected subcircuit with a 32 amp rating for a line
conductor, neutral conductor and a cpc to earth looped from
socket outlet to socket outlet. Metal conduit systems do not
require a cpc wire providing the conduit is electrically sound and
earthed. The number of socket outlets on a ring final circuit is
unlimited but a separate circuit must be provided for every 100 m^2
of floor area. To conserve wiring, spur outlets can be used as long
as the total number of spur outlets does not exceed the total
number of outlets connected to the ring and that there are not
more than two outlets per spur.
Electrical Installations