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

(Note: 1. For circuits exceeding 32A, Category 3 circuits, circuits
supplying essential equipment which are not readily
accessible to the general public, or circuits supplying
life-support systems, disconnection may occur within
5 seconds.
(Note:
2. For circuits exceeding 32A, Category 3 circuits, circuits
supplying essential equipment which are not readily
accessible to the general public, or circuits supplying
life-support systems, disconnection may occur within
0.4 second.)
(c) Protective devices for automatic disconnection should be provided by
means of one or more of the following types, as appropriate:
(i) overcurrent protective devices in compliance with regulation 9;
(ii) residual current devices or an equally effective device.
11C Protective Conductors
(1) Types of protective conductors
(a) Types of protective conductors, as illustrated in Figure 11(1), include:
(i) circuit protective conductors (CPC);
(ii) main equipotential bonding conductors;
(iii) supplementary bonding conductors; and
(iv) earthing conductors.
(b) Protective conductor(s) may be formed by:
(i) a separate conductor or cable,
(ii) the metallic sheath or armour of a cable,
(iii) part of the same cable containing the associated live
conductors,
(iv) rigid steel conduits, trunking or ducting, or
(v) the metal enclosure of the wiring system.
(c) Where the protective conductor is formed by metallic conduits,
trunking or ducting, the requirements as stipulated in Code 14
should also be observed as appropriate.
(d ) Flexible or pliable conduit should not be used as a protective conductor.
(2) Sizing of protective conductors
(a) If a protective conductor is not an integral part of a cable, or is not
formed by conduit, ducting or trunking, or is not contained in an
enclosure formed by a wiring system, the minimum cross-sectional
area should not be less than that given in Table 11(1).
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