Regulation 18

every high voltage conductor of such switchboard which is within touching distance of a person standing on a working platform of such switchboard or a passage leading thereto is so placed or protected as to prevent danger from arising;

all metal cases of every apparatus, device, indicator and other instrument of such switchboard which is capable of being operated at high voltage are earthed; and

all metal handles of every high voltage switch of such switchboard, and, where necessary to prevent danger from arising, all metal gears for operating the switch of such switchboard, are earthed.