(1) Grade H electrical work is electrical work on a high voltage electrical installation.
(2) An individual is qualified to hold a Grade H certificate if he satisfies the Director that he is qualified to hold a Grade B or Grade C certificate and that he-
(a) has completed a training course approved by the Director for the design, installation, maintenance, testing or operation of high voltage electrical equipment and installations; or
(b) has at least 1 year of practical experience in the design, installation, maintenance, testing or operation of high voltage electrical equipment and installations.