N2 Electrical Trade Theory|The Easy Way! 77 ▲ 6.12.1.1 An earth continuity conductor shall;
(a) consist of compatible conductors, (b) if it forms part of a cable other than a flexible cable, it must comply with the relevant requirements for that cable, and
(c) if it forms part of a flexible cable, be of the same material as, and have a nominal cross-sectional area at least equal to, that of the largest phase conductor.
Resistance of earth continuity conductor
▲ 8.7.3 Use a resistance meter to measure the resistance of the earth continuity conductors between the consumer’s earth terminal and the earthing terminals of all points of consumption and switches. Te values shall not exceed those given in table 8.1.
▲ 6.12.1.2 Earth continuity conductors shall be so arranged that they cannot be tampered with (the same applies to bonding conductors). ▲ 6.13.1.
▲ 6.12.1.3 A wireway (or metal conduit) shall not be used as an earth continuity conductor.
▲ 6.12.1.5 Connections of earth continuity conductors shall not rely only on twisting of the conductor or strands of the conductor.
▲ 6.12.1.6 A fuse or switching device shall not be fitted in an earth continuity conductor.
▲ 6.12.1.7 Earth continuity conductors shall be suitably protected against mechanical and other damage.
▲ 6.12.1.9 An earth continuity conductor shall not be used to carry any current, other than fault currents.
Earthing of exposed conductive parts ▲ 6.12.3.1 Te following conductive parts shall be earthed:
(a) all exposed conductive parts of an installation other than those described in 6.12.3.2,
(b) all conductive cable sheaths, armouring, and metal conduit, (c) the earthing terminal of a socket-outlet, (d) the secondary winding of a transformer if it is not a safety transformer, (e) earthing terminals of all permanently connected electrical equipment and appliances, and
(f) conductive parts of discharge light fittings.
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