As an employer you are obliged to provide the following, under the Health, Safety & Welfare at Work Act, S.I. 299 of 2007
89. An Employer Shall Ensure-
(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, a report of the test is completed by the competent person carrying out the test