NF C23-579-26:2005 Electrical apparatus for explosive gas atmospheres - Part 26 : construction, test and marking of Group II Category 1 G electrical apparatus.
2007NF C23-579-26:2007 Explosive atmospheres - Part 26 : equipment with equipment protection level (EPL) Ga.
2005NF C23-579-26:2005 Electrical apparatus for explosive gas atmospheres - Part 26 : construction, test and marking of Group II Category 1 G electrical apparatus.
2000NF C23-584:2000 Special requirements for construction, test and marking of electrical apparatus of equipment group II, Category 1G.