IEC 60034-5:2000 Rotating electrical machines - Part 5: Degrees of protection provided by the integral design of rotating electrical machines (IP code); Classification
IEC 60079-0:2004 Electrical apparatus for explosive gas atmospheres - Part 0: General requirements
IEC 60079-11:2006 Explosive atmospheres - Part 11: Equipment protection by intrinsic safety "i"
IEC 60079-7:2001 Electrical apparatus for explosive gas atmospheres - Part 7: Increased safety "e"