UL Standard 886;CSA Standard: C22.2 No.18;National Electric Code/CEC - 1-1/4" through 4" Class I, Division 1 & 2, Groups B, C, D Class II, Division 1, Groups E, F, G Class II, Division 2, Groups F, G Class III
UL Standard 886;CSA Standard: C22.2 No.30;National Electrical Code - Class l, Division 1 & 2, Groups A,B,C, D AND Class II, Division 1 Groups E, F, G AND class III, Division 2, Groups F & G