I am trying to run new ground wires from outlets in the house into my breaker panel that handles an old 2-wire system. There is only one panel after the meter that has the main cutoff, the various breakers and a neutral bar ( at the right in the photo ) with what look like bare copper grounding rods of varied thicknesses. Looking in the panel it only has one neutral bar where the white colored wires and bare copper rods connect. Is it proper to connect my new, green ground wires to that bar? Do I assume that there is a grounding rod for the box? If I do use that bar as my ground, is the position of my new green wire on the bar relevant?
btw, one of the smaller bare copper rods in the panel goes from the neutral bar down and into my crawl space, where it ends as if it has been cut sometime in the past. Could I, as a matter of convenience, use that as my ground if I place another box down there with a "grounding" bar. It could come in handy that way if I find a way to get ground wires to the outlets in other rooms on the lower floor.