變電站防爆空調(diào)表2爆炸性氣體混合物的組別與Z大試驗安全間隙或Z小點燃電流比之間的關系氣體組別Z大試驗安全間隙MESG(mm)Z小點燃電流比MICRIIAMESG≥0.9MICR＞0.8IIB0.9＞MESG＞0.50.8≥MICR≥0.45IIC0.5≥MESG0.