The boxes are being mounted to I beams with 1/4" bolts. All of the wiring is being run in MC. I am connecting all the wiring grounds but I was just wondering about the pigtail from the box to the receptacle grounds because the receptacles is mounted to the metal cover which in turn is mounted to the metal box with the mounting screws. Another problem I was having is the ground holes in the boxes are in the back. To put the ground screws in those holes I would have to pull all the boxes back off and drill the I beams behind them so that the grounding screw doesn't hit the I beam before it bottoms out. I drilled new holes in the boxes and tapped them with 6/32 tap and installed the grounding pigtail there. Is there a clip made for grounding purposes for metal boxes that I can use the next time instead of drilling new holes? Thanks for the replies, I love this site!
