It's important to recognise that ATEX places responsibilities on EMPLOYERS not just suppliers of equipment.
In fact the first step is for employers to carry out, or have carried out for them, a risk analysis of the workplace to establish if there is a 'potential explosive atmosphere' and if there is to designate the appropriate Zone. Zones 0,1,2 for gases and vapours Zones 20, 21, 22 for dusts. Suitable equipment must then be selected for use according to the Zone selected.
If manufacturers offer equipment for use in ATEX Zones then it must be certified according to Zone. The statement from Carburize is not quite correct in that if you don't place equipment on the market for use in potentially explosive atmospheres then ATEX certification is not required.
Currently non-compliant equipment already installed can still be used, you just have till 2006 to make it compliant (or replace it!!).
One concern currently is that there may be 'over zoneing'just to be on the safe side without the realisation of the serious implications this may have.
It may also have non-taffif barrier implications for those outside the EU, but the law is there and can't be ignored. I believe the transition period was 7 years untill 1st July 2003 implimentation. Maybe that was too long and everyone forgot about it untill the last minute.