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I also found this. NEC 250.30(A)(1) Exception No. 2 | Mike Holt's Forum 2017 NEC 250.30(A)(1) Exception No. 2 includes the words "If a building or structure is supplied by a feeder from an outdoor separately derived system, a system bonding jumper at both the source and the first disconnecting...

This picture clears up the "why you do not bond ground + neutral in a sub panel that is "connected" to the main panel in a 4 wire connection. L1, L2, N, G. If your neutral gets disconnected on the sub panel the existing metal infrastructure could be carrying the current. This would not be...

And thinking in this way, I guess there is more more option, I could run a new single ground wire all the way back to the main panel? Even, If I did this, I think it would still be a good idea to have a local set of ground rods at the remote building?

I see. Which is why even if there was a 4th "ground" wire it would still run back to the source "neutral", right? BTW, I like how you wrote this response, it seems to make more sense to me.

Oh and about the poll, the labels are intended to be small. I know that "a ground rod" really means two because that is what is in the original post.

I'm just not sure about bonding because I've read content where one says to bond and others that says to not bond. All the articles and such that do say to bond is only for cases like mine where the building is so far away AND is *only* using 3 conductors between buildings. I have never seen...

BTW, I had thought about the Sense device but it was really expensive.

I currently use a ZW095 with a Vera Lite controller. However this unit is not easy to use for a standard user. I'm a software developer and I use it to create my own software. It only monitors the main input. My software graphs / data captures Now I have purchased a Emporia with 8 sub...

ok, I added my question with a poll to this thread. (1) Disconnected Barn Sub Panel missing Ground? | HouseRepairTalk

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...

I have taken pictures and will post a new thread. I will link it here when I have a chance to create it. I like the activity on this site. I just happen to run across it doing a bing image search.

Yeah I was just hoping. You never know. Maybe they'll get an email notice, log back in, and reply? It was worth a shot.

How did this workout? Did you bond? I almost have this same setup however my "out bldg" doesn't even have a ground... I want to add a ground and do it correctly.