1. The works of an electricity entity must incorporate an earthing and protection system, to a recognised electricity supply industry standard capable of ensuring the following:

    1. reliable passage of fault current;
    2. reliable passage of single wire earth return load currents to ground or source;
    3. reliable operation of circuit protection devices;
    4. safe step, touch and transfer potentials for all electrical equipment;
    5. appropriate coordination with the earthing and protection systems of other electricity entities;
    6. protection against likely mechanical damage, inadvertent interference and chemical deterioration; and
    7. mechanical stability and integrity of connections.
  2. Without limiting subsection (1), the following specific requirements apply for the works of an electricity entity-
    1. to stop, as far as practicable, a person suffering electric shock-
      1. if the Multiple Earthed Neutral system of earthing is used, the neutral conductor of the system must be effectively earthed; and
      2. each non current carrying exposed conductive part of an electric line or generating plant must be effectively earthed;
    2. each non current carrying exposed conductive part of a substation must be effectively earthed;
    3. a system of earthing must be tested as soon as practicable after its installation to prove its effectiveness; and
    4. a high voltage electric line must be protected by a suitable fuse, circuit-breaker or equivalent device.
  3. Earthing is not required under subsection (2)(a)(ii) or (b) in circumstances where the electricity entity, in accordance with a recognized practice in the electricity industry, considers that for safety reasons earthing is not appropriate.

Section 130 – Connection of high voltage circuit to earth

  1. Each distinct high voltage system included in the works of an electricity entity must be connected to earth by direct connection or through a resistance or a reactance.
  2. All reasonable precautions must be taken to ensure that, for the circumstances in which the system is to operate, fuses or circuit-breakers in the system will operate during fault conditions.

Section 132 – Insulation of stay wire

If a stay wire attached to a pole or structure supporting an overhead electric line forming part of the works of an electricity entity does not form part of an earthing system, the wire must be insulated to prevent, as far as practicable, any person suffering an electric shock.

Section 133 – Protection of earth conductors

To prevent, as far as practicable, any person suffering an electric shock, earthing conductors installed on the outside of a pole or structure supporting an overhead electric line forming part of the works of an electricity entity must be, from ground level to a height of at least 2.4m

  1. insulated or suitably covered by a nonconductive material; and
  2. protected from mechanical damage.

Last updated July 18, 2005

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