Class 1 Div 2 terminal box requirements
Class 1 Div 2 terminal box requirements
(OP)
I have an application where a piece of equipment will be taken down and re-assembled repeatedly in Class 1 Div 2 locations. It will have 480/3/60 motor circuits and 120/1/60 control circuits. All of the motor controls will be located in enclosures rated for Class 1 Div 1, and all points of entry into and out of these enclosures will have seal fittings. Wires coming out of the elcosures will be routed in rigid conduit. At points where the equipment will be dis-assembled I will need junction boxes. Would junction boxes with only terminal strips for the motor and control circuits be required to be explosion-proof as well, or are Nema 4 and 4X boxes permitted? Please respond with a good reference.






RE: Class 1 Div 2 terminal box requirements
See wiring methods 501.10 (B)Division 2(4) Boxes and Fittings. "Boxes and fittings shall not be required to be explosionproof except as required by 501.105(B)(1), 501.115(B)(1), and 501.150(B)(1)." The sections cited apply to the contacts etc. Use rigid or intermediate conduit with bonding locknuts and bushings.