DS EN 1834-3:2001 Reciprocating Internal Combustion Engines - Safety Requirements For Design And Construction Of Engines For Use In Potentially Explosive Atmospheres - Part 3: Group 2 Engines For Use In Flammable Dust Atmospheres Defines the safety requirements for reciprocating internal combustion compression ignition engines of group II categories 2 and 3 for use in flammable dust atmospheres.