I have a question about properly grounding my service panel. The existing 125V service panel didn't have any grounding bar inside the panel. Most of the house is just 2-wire in metal conduit without a ground wire, but the metal conduit is bonded to the water and gas pipes. The previous owner replaced a couple of the service lines from the panel to junction boxes with NM 2-wire, and connected the ground wire to the service panels neutral bar. I'm doing a kitchen and bathroom remodel and updating all electrical to those rooms. I will eventually get to the rest of the house, but need to get a proper grounding system for the current work. As I mentioned the existing metal electrical conduit has been bonded to the water and gas pipes. As far as I can tell, due to the age of the house, there is no grounding system besides the metal conduit being bonded to the water pipes. The water pipe is metal and extends more than 10' into the earth. I'd like to install a grounding rod, but this is January in MN and the ground is frozen solid. If I add a ground bar in the panel, and bond that to the water pipe on the service side of the water meter, will that be sufficient gounding assuming the resistance test is sufficient? Or is a grounding rod (or two) a necessity?

Ok. So about a year ago I had an electrician install me a 220v 60A circuit on my panel and wire it to a subpanel in my office. The subpanel has two 30a breakers if I remember correctly. What I am wanting to do is disconnect that subpanel and remove that cable and run a longer cable to the barn with is about 150' or less. What kind of cable would I need to run? And I should be good to go with the existing 60a circuit and subpanel. Right?