25.—(1) Where necessary to prevent danger, energy distribution installations must be suitably located, periodically checked and clearly indicated.
(2) Where there is a risk to construction work from overhead electric power cables—
(a)they must be directed away from the area of risk; or
(b)the power must be isolated and, where necessary, earthed.
(3) If it is not reasonably practicable to comply with paragraph (2)(a) or (b), suitable warning notices must be provided together with one or more of the following—
(a)barriers suitable for excluding work equipment which is not needed;
(b)suspended protections where vehicles need to pass beneath the cables; or
(c)measures providing an equivalent level of safety.
(4) Construction work which is liable to create a risk to health or safety from an underground service, or from damage to or disturbance of it, must not be carried out unless suitable and sufficient steps (including any steps required by this regulation) have been taken to prevent the risk, so far as is reasonably practicable.