89. An employer shall ensure that—

(a) a new electrical installation and a major alteration of, or extension to, an existing electrical installation is, after completion, inspected and tested by a competent person and a report of the test is completed verifying that the relevant requirements of this Part have been complied with,

F25[(b) an existing electrical installation is tested by a competent person in an appropriate manner—

(i) from time to time where required having regard to the nature, location and use of the installation, or

(ii) if an inspector so requires,

and a report of the test is completed by the competent person carrying out the test,]

(c) the advice of an inspector, or competent person, on the necessity for further testing of an electrical installation is acted upon having regard to the condition of the installation and the outcome of any tests referred to in paragraphs (a) and (b), and

(d) all defects found during the testing and inspection of an electrical installation are rectified promptly so as to prevent danger.