303Installation of protective equipment

303 Installation of protective equipment

(1) In the case of an aerial service line, protective equipment must be installed—

(a) at, or next to, the point of supply; or

(b) at, or next to, any point where an unmetered consumer's mains is attached to the consumer's premises; or

(c) at any pole to which a consumer's mains is attached; or

(d) at the electricity supplier's pole to which a service line is connected.

(2) In the case of an underground service line, protective equipment must be installed—

(a) at, or next to, the point at which the consumer's mains is connected to the electricity supplier's supply main; or

(b) at, or within 3000 millimetres of the point at which the electricity supplier's supply cable crosses the property boundary of the property that it supplies; or

(c) if an aerial service line has been converted to an underground line, at the point at which the aerial service line was connected to the consumer's premises; or

(d) at, or next to, the electricity supplier's metering equipment located at the consumer's premises, but only if the unmetered portion of the consumer's mains that runs from the property boundary to the building or structure housing the metering equipment is suitable for use underground and—

(i) is of a double insulated construction; or

(ii) is surrounded by a neutral screen.

(3) In the case of low voltage electricity supplies to a directly connected installation—

(a) if the electricity supply is connected or will be connected to a substation constructed or reconstructed after 1 December 2020, low voltage protective equipment must be installed within the substation; or

(b) if the electricity supply is connected or will be connected to a substation constructed or reconstructed before 1 December 2020, low voltage or high voltage protective equipment must be installed within the substation; or

(c) if the electricity supply is connected or will be connected to a pole-mounted substation, low voltage protective equipment must be installed on the substation pole.

(4) Despite subregulation (3)(a), high voltage protective equipment may be used to protect low voltage electricity supplies if—

(a) the main switchboard of the directly connected installation and the substation it is connected to are located in adjoining rooms; and

(b) discrimination between any low voltage protective equipment within the substation and the directly connected installation's first low voltage protection device cannot be achieved; and

(c) the high voltage protective equipment installed in the substation will achieve the same level of protection as would have been achieved if subregulation (3)(a) had been complied with.