161—How the work is to be carried out
(1) A person conducting a business or undertaking must ensure that electrical work on energised electrical equipment is carried out—
(a) by a competent person who has tools, testing equipment and personal protective equipment that—
(i) are suitable for the work; and
(ii) have been properly tested; and
(iii) are maintained in good working order; and
(b) in accordance with a safe work method statement prepared for the work; and
(c) subject to sub-regulation (5), with a safety observer present who has the competence and qualifications specified in sub-regulation (4).
(4) For the purposes of subregulation (1)(c)—
(a) the safety observer must be competent—
(i) to implement control measures in an emergency; and
(ii) to rescue and resuscitate the worker who is carrying out the work, if necessary; and
(b) the safety observer must have been assessed in the previous 12 months as competent to rescue and resuscitate a person.
(5) A safety observer is not required if—
(a) the work consists only of testing; and
(b) the person conducting the business or undertaking has conducted a risk assessment under regulation 158(1)(a) that shows that there is no serious risk associated with the proposed work.