For Group A and B: Class I, Division 1 And 2, Groups A , B, C, D, Class II, Division 1 And 2, Groups E, F, G, Class III; For Group C and D: Class I, Division 1 And 2, Groups C, D, Class II, Division 1 And 2, Groups E, F, G, Class III; UL 1598, UL 844, UL E