I'm replacing an existing 100 amp service and need to install a meter/disconnect outside, my problem is inside the meter/disconnect enclosure there is only 3 lugs available for grounding, not counting the big lug for the service neutral/ground. I live in massachusetts and we need to install a interconecting ground bar under the enclosure. one of the lugs will take up one spot for the wire that goes to that interconecting ground lug then continues to the 2 ground rods. The second spot is for the grounding electrode conductor that goes to the water pipe inside. I still have the ground wire and neutral wire of the 4 conductor ser going to the panel, but only have one lug left, can i instead of running the grounding electrode conductor to one of the lugs in the enclosure install it in the interconecting ground bar under the meter enclosure and then run it to the water meter? Has anyone else run into this situation?