2012BS EN 60079-11:2012 Explosive atmospheres. Equipment protection by intrinsic safety "i"
2008BS EN 60079-27:2008 Explosive atmospheres. Fieldbus intrinsically safe concept (FISCO)
2006BS EN 60079-27:2006 Electrical apparatus for explosive gas atmospheres - Fieldbus intrinsically safe concept (FISCO) and fieldbus non-incendive concept (FNICO)