Attributes . SGS USTC Class 1 Division 1 Groups, A, B, C, D Temp code T3C (Approved to UL-913), SGS/USTC Class II, Division 1, Groups E,F,G, ATEX (DEMKO) Ex d ia llC 170C (T3), IECEx Ex d ia llC 170C, CSA Class l Division l Groups A, B, C, D Temp Code T3C, NEPSI (Chinese) Approval Ex d ia llC 170C (T3) . Names