ANNEX IIU.K.ESSENTIAL HEALTH AND SAFETY REQUIREMENTS RELATING TO THE DESIGN AND CONSTRUCTION OF EQUIPMENT AND PROTECTIVE SYSTEMS INTENDED FOR USE IN POTENTIALLY EXPLOSIVE ATMOSPHERES
2. Supplementary requirements in respect of equipment U.K.
2.3. Requirements applicable to equipment category 3 of equipment-group II U.K.
2.3.1. Explosive atmospheres caused by gases, vapours or mists U.K.
2.3.1.1.Equipment must be so designed and constructed as to prevent foreseeable ignition sources which can occur during normal operation.U.K.