SANS 60079-12-1978 爆炸气体环境用电气设备．第12部分：气体或蒸气混合物按照其最大试验安全间隙和最小点燃电流的分级
Electrical apparatus for explosive gas atmospheres Part 12: Classification of mixtures of gases or vapours with air according to their maximum experimental safe gaps and minimum igniting currents
Provides guidance on the selection of the appropriate group or subgroup of electrical apparatus, protected by flameproof enclosure or designed to be intrinsically safe, according to the gas or vapour in which it is intended to be used. Provides the basi