FR Series: UL 1598, UL E187946, C22.2 No. 250, CUL E187946, FZ Series: Class I, Zone 2, IIC, AEx nA IIC T5 Ex nA IIC T5 UL 1598, UL 844, UL 60079-0, UL 60079-15, UL E10794, C22.2 No. 250, C22.2 No. 137, CAN E60079-0, CAN E60079-15, CUL E10794, FD Series: C