GOST R 51330.11-1999 Explosionprotected electrical apparatus. Part 12. Classification of mixtures of gases or vapours with air according to their maximum experimental safe gaps and minimum igniting currents*, 1999-04-19 Update
GOST R 51330.19-1999 Electrical apparatus for explosive gas atmospheres. Part 20. Data for flammable gases and vapours relating to the use of electrical apparatus*, 1999-04-19 Update
GOST R 51330.2-1999 Electrical apparatus for explosive gas atmospheres. Part 1. Construction and verification test of flameproof enclosures of electrical apparatus. First supplement. Appendix D. Method of test for ascertaintment of maximum experimental safe gap*, 1999-04-19 Update
GOST R 51330.5-1999 Explosionprotected electrical apparatus. Part 4. Method of test for ignition temperature*, 1999-04-19 Update