Reciprocating internal combustion engines. Safety requirements for design and construction of engines for use in potentially explosive atmospheres. Group II engines for use in flammable dust atmospheres|Equipment safety, Marking, Dust, Design, Records (documents), Stopping, Alarm systems, Type testing, Compression-ignition engines, Fire risks, Starters, Engine exhaust systems, Explosive atmospheres, Temperature, Flammable atmospheres, Verification, Safety measures, Air intakes, Leak tests, Reciprocating engines, Failure (mechanical), Electrostatics, Visual inspection (testing), Electrical equipment, Mechanical testing, Hazards, Designations, Inspection, Cut-out devices, Internal combustion engines