Regulation 15 Precautions against access
(1)
Every support carrying a high voltage overhead line shall, if the circumstances reasonably require, be fitted with devices to prevent, so far as is reasonably practicable, any unauthorised person from reaching a position at which any such line would be a source of danger.
(2)
The supplier shall attach and keep attached safety signs to supports carrying a high voltage overhead line of such size and placed in such positions as are necessary to give due warning of danger in all the circumstances.