Electrical apparatus for explosive gas atmospheres - Part 1-1: Flameproof enclosures "d" - Method of test for ascertainment of maximum experimental safe gap— 19 стр.
Explosive atmospheres -- Part 37: Non-electrical equipment for explosive atmospheres -- Non-electrical type of protection constructional safety ''c'', control of ignition sources ''b'', liquid immersion ''k''— 108 стр.