Q. What type of fitting can I use to terminate ground wires in a metal box?

A. The termination of equipment grounding and bonding conductors must be by exothermic welding, listed pressure connectors of the set screw or compression type, listed clamps, or other listed fittings [250.8]. In addition, as shown in the Figure, equipment grounding (bonding) conductors that enter a metal box must be bonded to the box by a grounding screw that serves no other purpose or a listed device (like a ground clip) [250.148(C)].