sec.245Systems of earthing

sec.245 Systems of earthing

The works of an electricity entity must incorporate an earthing and protection system, in accordance with relevant industry standards and practices, capable of ensuring the following— reliable passage of fault current; reliable passage of single wire earth return load currents to ground or source; reliable operation of circuit protection devices; safe step, touch and transfer potentials for all electrical equipment; appropriate coordination with the earthing and protection systems of other electricity entities; protection against likely mechanical damage, inadvertent interference and chemical deterioration; mechanical stability and integrity of connections. Without limiting subsection (1) , the following specific requirements apply for the works of an electricity entity— to stop, so far as is reasonably practicable, a person suffering electric shock— if the multiple earthed neutral system of earthing is used—the neutral conductor of the system must be effectively earthed; and each non-current carrying exposed conductive part of an electric line or generating plant must be effectively earthed; each non-current carrying exposed conductive part of a substation must be effectively earthed; a system of earthing must be tested as soon as practicable after its installation to prove its effectiveness; a high voltage electric line must be protected by a suitable fuse, circuit breaker or equivalent device. Earthing is not required under subsection (2) (a) (ii) or (b) if the electricity entity, in accordance with recognised practice in the electricity industry, considers for safety reasons that earthing is not appropriate in the circumstances. (sec.245-ssec.1) The works of an electricity entity must incorporate an earthing and protection system, in accordance with relevant industry standards and practices, capable of ensuring the following— reliable passage of fault current; reliable passage of single wire earth return load currents to ground or source; reliable operation of circuit protection devices; safe step, touch and transfer potentials for all electrical equipment; appropriate coordination with the earthing and protection systems of other electricity entities; protection against likely mechanical damage, inadvertent interference and chemical deterioration; mechanical stability and integrity of connections. (sec.245-ssec.2) Without limiting subsection (1) , the following specific requirements apply for the works of an electricity entity— to stop, so far as is reasonably practicable, a person suffering electric shock— if the multiple earthed neutral system of earthing is used—the neutral conductor of the system must be effectively earthed; and each non-current carrying exposed conductive part of an electric line or generating plant must be effectively earthed; each non-current carrying exposed conductive part of a substation must be effectively earthed; a system of earthing must be tested as soon as practicable after its installation to prove its effectiveness; a high voltage electric line must be protected by a suitable fuse, circuit breaker or equivalent device. (sec.245-ssec.3) Earthing is not required under subsection (2) (a) (ii) or (b) if the electricity entity, in accordance with recognised practice in the electricity industry, considers for safety reasons that earthing is not appropriate in the circumstances.