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	Subject - Service Grounding and Bonding kp I am installing a service for 3 200 amp panels. The meter socket has the 3 200 amp breakers in the enclosure. Of course we used 4/0 sub feed. I decided to use 500 kcmil copper for the line side of the service. How should I size the water bond for each of the three units. Can I run 3 #4's to each units water meter and the standerd ground rods outside. Or do I need to size the water bond according to the size of the line side of the service? Pierre Belarge You will need to install a 1/0 copper conductor to the cold water. At the panels then install GEC taps as per 250.64(D) sized by the conductor going to each disconnect. Pierre lctrc789 Pierre is right you have to size your grounding conductor by the size of your service conductors. (500KCM) 1/0 copper wire to the water ground from each panel, then you can use # 6 for your ground rod. kp The service outside houses the 3 200 mains, so do I run 1/0 once through each of the 3 water mains. or 1 run for each water main.? lctrc789 If you have 3 seperate 200 amp disconnects or panels you must have each main grounded, but if you have only one main service then it can be grounded as the main. kp Thanks everyone, I finally got it. I should have been clearer, so here it is. I have one panel outside with the sockets and the main breakers, and 3 main lug panels in doors in 3 different units. Each unit has its own water line from the street. So I ran a 1/0 copper from outside to the closest water meter, and ran #4 from each of the other water meters to there respective subpanels. sparkyvolt need a ground wire size for a 200 amp panal 3/0 with a #6 wire? not sure thx jagerbombme I would imagine if you had three separate services inside one meter socket then you have three separate neutral buses requiring 3 separate ground rods for each different neutral bus. I can't imagine the NEC would permit those neutrals to be bonded together sharing a common ground. so i would imagine 3 separate ground rods with three separate #6's outside and then taking a #6 for each service inside to it's respective MLO and grounding to it. And then taking #4's from each MLO to it's respective water main? i am guessing this is correct, but i am not sure. taking a stab at it jagerbombme not sure on spacing of ground rods either. depending on how far you have to space them you might want to upsize all the grounding conductors to #4's. even the one's from the meter socket to the MLO's depending on how far they are from the metersocket. interested to hear the correct answer here. that is what i would do though, although i am here learning myself