89—Requirement to provide warning devices when carrying out site radiography using apparatus
(1) If site radiography is carried out using apparatus, a red or amber rotating or flashing light visible at all points along the barriers referred to in regulation 85
must be provided and activated whenever the X-ray tube is energised.
(2) A person must not carry out or cause or permit another person to carry out site radiography using apparatus unless warning devices as specified in subregulation (1)
have been provided in accordance with that subregulation.