Code of Practice for the Electricity (Wiring) Regulations - 2009 Edition

(b) The circuit protective conductor of a ring circuit (other than formed by
the metal coverage or enclosure containing all conductors of the ring
circuit) should also be run in the form of a ring having both ends
connected to the earthing terminal at the origin of the circuit.
(c) When two or more ring final circuits are installed, socket outlets and
equipment to be served by these circuits should be evenly and reasonably
distributed among these separate ring final circuits.
6D Final Circuits Using 5A or 15A Socket Outlets to
Requirements Prescribed in Appendix 1
(a) Radial final circuits should be used.
(b) Each 5A and 15A socket outlet should be individually connected and
protected by a high breaking capacity (HBC) fuse or miniature circuit
breaker (MCB) of rating 5A and 15A respectively.
6E Final Circuits Using 13A Socket Outlets to Requirements
Prescribed in Appendix 2
(1) General
(a) Ring or radial final circuits should be used.
(b) The circuit, with spurs if any, may feed permanently connected
equipment and an unlimited number of socket outlets in a limited
floor area determined by Table 6(1). A typical circuit is illustrated in
Figure 6(2).
(2) Spurs
(a) For a final circuit in compliance with Table 6(1), the number of fused
spurs connected is unlimited but the number of non-fused spurs
should not exceed the total number of socket outlets and fixed
equipment permanently connected in the circuit.
(b) A non-fused spur should feed only one single or one twin socket
outlet or one permanently connected equipment. Such a spur should
be connected to a circuit at the terminals of socket outlets or at joint
boxes or at the origin of the circuit in the distribution board.
(c) A fused spur should be connected to the circuit through a fused
connection unit, with the rating of the fuse not exceeding that of
the cable forming the spur, and not exceeding 13A in any event.
(3) Separate circuits
Separate circuits are to be used for:
(a) socket outlets and fixed appliances in kitchens;
(b) electric water heaters;
(c) permanently connected space heaters; and
(d ) air-conditioning units.
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