Regulation 25 Supplier’s works on consumer’s premises
The supplier shall ensure that all his works on a consumer’s premises which are not under the control of the consumer (whether forming part of the consumer’s installation or not) are—
suitable for their respective purposes;
installed and, so far as is reasonably practicable, maintained so as to prevent danger: and
protected, so far as is reasonably practicable, by a suitable fusible cut-out or automatic switching device as close as reasonably practicable to the supply terminals.
Provided that no such fusible cut-out or automatic switching device shall be inserted in any conductor connected with earth.
The standard of construction and installation to be adopted in complying with paragraph (1) shall not be lower than that imposed by regulation 27.
Every cut-out or automatic switching device mentioned in paragraph (1)(c) on premises not under the supplier’s control shall be enclosed in a locked or sealed container.
Any electric line which forms part of the supplier’s works and which is taken into a building at a point below the level of the ground shall be so installed as to prevent, so far as is reasonably practicable, the influx of any noxious or explosive liquid or gas at the point of entry.
The supplier shall mark permanently the separate conductors of electric lines connected to supply terminals as close as practicable to those terminals to show the polarity of each conductor and, where appropriate, phase rotation.