ATEX ZONE 0 (GAS) 20 (DUST)

A place in which an explosive atmosphere consisting of a mixture with air of flammable substances in the form of gas, vapour or mist (zone 0) or dust (zone 20) is present continuously or for long periods or frequently (1.000hrs/365d).

For these zones is impossible to realize any Ex Conversion.
“Zoning” is not a concept to be found in Directive 94/9/EC but in Directive 1999/92/EC dealing with employer’s obligations with respect to employees operating in hazardous atmospheres.

It is not the responsibility of the manufacturer to “zone” but evidently this it is helpful to give an example of the area of intended use.