That is not my understanding and it is not my experience. However, the code is very complex and hard to read..... maybe there is a clause that allows or requires the extra bonds but I can't find it and it violates everything I thought I understood about bonding.
I love watching Holt's videos. He does a great job of explaining the WHY behind the code. When I first started teaching myself about grounding, there were a lot of things that made no sense to me. Holt's videos not only helped me understand a lot of the requirements, but he also helped me understand that some of the requirements in the code are not well supported by science. This was a surprise to me because I assumed the NEC had something as 'simple' as grounding figured out a long time ago.
C feeds a feeder circuit. Must be the house.
Yes, white tape, appears to be neutral for the feeder circuit.
Connected to M, I'll guess for building this is attached to.
Neutral goes to H
Very confusing, the smaller conduit has quite a few wires in it, my assumption is it goes to the 2 panels at the house.
Here we go again with a complete lack of understanding of what the NEC is trying to do to protect us. It is a serious concern because a lightning strike near by will cause a massive differential in voltage between the 2 ground rods. It is up to you and your sparky to decide if this needs to be dealt with.
You're correct, as this is a multi branch circuit, then it needs a grounding conductor. In my case, the Ufer is grounding conductor and it not bonded to N. It merely connects to the G busbar and interconnects with the grounding conductor.
It is fun to guess what is what in that box, but I will wait to see what the OP says.
As an aside. UFER grounding is considered one of the lowest resistance and most stable ways to do it. It was originally developed by the military (I think it was for Bomb Depots in dry climates). The encasement in concrete means the rebar is very stable and does not deteriorate over time. When I first heard about these I thought the concrete would be too good of an insulator, but apparently not. The concrete will conduct and the sheer size of the contact area to the rebar makes for an excellent connection to earth ground.
Correct. Herbert Ufer worked for UL and helped the military lower ground resistance in poor soil.
When connecting 2 grounding electrodes (rods) should the connection be buried? Solid or stranded? Bare or insulated? What would be the max distance between 2 grounding electrides (rods)?
I don't think the code requires solid or stranded but I would think solid would be better from a corrosion point of view.
I don't think there is a max distance.... but there is kinda a min distance. The code requires 25 ohms of resistance or less. However, the code does not specify the distance between rods. It turns out that if you put two rods right next to each other, the resistance will not be much lower than just a single rod. The rule of thumb is that the rods should be as far apart from each other as they are long. Therefore, if you are using 8' rods, the rods should be at least 8' apart.
Edited to clarify I was only talking about the NG Bonds.
Mike holt is very well respected and very active in writing the NEC so I trust what he says. However, it is an old article so I looked at 250-32(b)(1) in the 2020 version of the code. The wording is different but with the same meaning (but the wording is harder to understand)
A 'grounded conductor' is a current-carrying conductor that is tied to the grounding system. So, at the service entrance, the System Bonding jumper bonds ground to Neutral, and neutral becomes a 'grounded conductor'. Therefore Neutral must not be tied to ground at the separate structure.
No grounding conductor in the feeder?... that is a whole different kettle of korn ?.
Don't bother.... it does not matter that much.
