I'm running a few outlets to my basement from the main panel on the first floor. Since it is a garage, sealed 3/4" pvc conduit runs through the concrete into the basement. This connects to a metal junction box and 3/4 emt, with metal junction and outlet boxes the rest of the way. There are two 20 amp circuits and one 15 amp circuit for the lights. I know that I can use the emt itself as the ground path as long as it is connected to the main panel. My question is: Would it be code compliant to run one ground wire from the main panel, through the pvc, to the first metal junction box, and then ground all of my outlets to their outlet boxes further down the line? Thanks for the input! -Matt
Yes, you can do that. The hard part is getting the ground wire in the conduit. You've already got 6 wires in the conduit so you'll probably have to pull them out and add the ground wire, #12 THHN stranded, and re pull the whole bunch. Use an eye terminal and a 10-32 grounding screw to attach to the first metal box and that will ground the rest of the EMT.