the heart of the flameproof concept is in providing a strong and closely fitting enclosure to protect its contents . the enclosure must be capable of containing an explosion.
the contents are not really that important although there are some restrictions for fluids and batteries As long as there is plenty of internal free space most contents will be OK.
flameproof protection lends itself to utilising off-the-shelf example electronic control boards.the enclosure can either be purpose desingned or you could take advantage of a component certified flameproof enclosure removes any uncertainty about ist integrity.
if operator control is required required several manufacturers offer pushbuttons etc that are component certified and be fitted to an enclosure
Generally flameproof enclosures are made of cast iron or aluminium making them quite heavy. they are generally expensive as the size increases and the subsequent weight makes installation a specialist task.
plastic enclosures can be designed to meet the construction and strength requirements. Usually plastic enclosures are quite small because they have to have thicker wall sections compared to a metal counterpart to withstand the explasion pressure A metal enclosure is usually cheaper to manufacture