Electrical apparatus for explosive atmospheres—Classification of gases or vapours with air according to their maximum experimental safe gaps and minimum igniting currents
Electrical apparatus for use in the presence of combustible dust—Part 1-2:Electrical apparatus protected by enclosures and surface temperature limitation—Selection,installation and maintenance
Electrical apparatus for use in the presence of combustible dust—Part 1-1:Electrical apparatus protected by enclosures and surface temperature limitation—Specification for apparatus