The selection of equipment in a classified area (Zones 0 , 1, 2 , 20, 21 and 22) has to be aligned with the applicable Equipment Protection Level Ga, Gb, Gc, Da, Db, Dc, Ma and Mb installed accordingly.
Classification of Ex hazardous area zones does not require the identification of possible ignition sources.
Keep up good work!
Arpad
exprofessional.com
Breathing and draining devices shall incorporate permeable elements which can withstand the
Quality at work — the desire, not just to defend minimum standards,
“in some cases a zone of negligible extent (NE) may arise and
ADR clearly defines:
It means a lorry shall be prepared for the delivery of dangerous goods, and in that case no Ex zone shall (can) be defined.
For all other operations such as loading, unloading, maintainence, repair…
YES…
Ex zone shall be defined!
arpadveress 
