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 35-1: Caplights for use in mines susceptible to firedamp - General requirements - Construction and testing in relation to the risk of explosion (IEC 60079-35-1:2011) (english version)