| What equipment can be used? - Ex-Zones and Categories Table 1 shows the zone designations, which are divided firstly into the hazardous areas for gases, vapours and mists and secondly into the hazardous areas for dusts, as well as by their risk categories, i.e. according to the probability of a risk of being present. The categories, which define the degree of equipment safety are assigned. It can be seen from the table to which category a piece of equipment must be allocated in order to be used in a particular zone. Of course, equipment in a higher category also fulfils the requirements of a lower category. |