An employer or user of machinery must not require or permit electric welding to be undertaken in wet or damp
places, inside metal vessels or in contact with large masses of metal, unless
- the insulation of the electrical leads is in a sound condition;
- the electrode holder is completely insulated to prevent accidental contact with current-carrying parts;
- the welder is completely insulated by means of boots, gloves or rubber mats; and
- at least one other person who has been properly instructed to assist the welder in case of an emergency is and remains inattendance during operations:
however this provision does not apply to a welding process where the maximum voltage to earth does not exceed 50 volts.