Our barn is 500' line of sight and 700' by road away from our house. The barn has power but I noticed the ground is not connected. Now I think this panel, by today's standards, should have been connected with a 4 wire system that should have included L1, L2, N, and a ground. However this is an older system that only use a 3 wire system of L1, L2, and N.
Now I think all I have to do is just connect a wire from my ground bus bar to 2 ground rods that are 6' away from each other. Now I'm also thinking that I should "bond" the Neutral and Ground here because it's a detached subpanel that is so far away.
What do you think? Any suggestions or ideas?
My question is very similar to (1) Bonded Ground and Neutal in Outbuilding Panel | HouseRepairTalk