I offer some points of clarification;
The requirement in Australia comes from what is commonly known as "The Wiring Rules" (AS3000) and is for the occupier of premises to assess the area in accordance with an Australian Standard (AS2381) and determine if it is a "hazardous area". If it is, then the electrical equipment installed in that area must comply with IECEx requirements.

The IECEx scheme is the most stringent in the world, and so far only two compaines worldwide have equipment with Certificates of Conformity in accodance with the scheme. One of them is our company, Grimwood Heating in Villawood, NSW.

It is the responsibility of the user and the occupier of premises to determine if their operation is a "hazardous area", and if so to ensure any electrical equipment installed in that area complies with the standard.

It is also the responsibility of the purchaser to specify at the time of ordering equipment that the equipment is to used in a hazardous area and to specify the classification of that area.