21-66 WIRING METHODS FOR CLASS I, ZONE 0, 1, AND 2 LOCATIONS - 505.15(A) THRU (C)
21-23 WIRING METHODS USED FOR LIMITED FLEXIBILITY (CLASS I, DIVISION 2) - 501.10(B)(2)(1) THRU (7)
Hazardous location wiring methods - L3 D7 LT2
21-45 WIRING AND EQUIPMENT INSTALLED ABOVE CLASS I LOCATIONS - 511.7(A) AND (B)
21-37 CABLE SEALS - 501.15(D)(1), (D)(2) & (D)(3)
