1. Recommended Practice for the Classification of Flammable Liquids, Gases or Vapors and of Hazardous Classified Locations for Electrical Installations in Chemical Process Areas;NFPA 497,2012
2. Recommended Practice for the Classification of Combustible Dusts and of Hazardous Classified Locations for Electrical Installations in Chemical Process Areas;NFPA 499,2013
3. Explosive Atmospheres – Part 10-1: Classification of Areas – Explosive Gas Atmospheres;IEC 60079-10-1,2015
4. Explosive Atmospheres – Part 10-2: Classification of Areas – Combustible Dust Atmospheres;IEC 60079-10-2,2015
5. Explosive Atmospheres – Part 32-1: Electrostatic Hazards – Guidance;IEC/TS 60079-32-1,2013