Zone 0 & Zone 1 Torches
Zones denote the areas in which a torch is safe to use.
Zone 0 torches are safe to use in areas where an explosive atmosphere of gas, vapour or mist is continuously present, such as inside a subterranean petrol tank.
Zone 1 torches are safe to use in an area in which an explosive gas atmosphere is likely to occur in normal operation, i.e. around the petrol pump.