Here is my dilemma. I have to ground a weather vane which is a 20 feet of 2" rigid in the center and above the main roof. It is anchored to the wall where the roof access three stories up. The building is part poured concrete and prefab concrete located in a very hospitable area weather rise. Imagine a harden concrete bunker that is a maze of floors, rooms, and concrete. This building is like that but worse.
The #2 GEC needs to go down two floors and a good 100' through a dozen concrete walls which will not be easy to drill, even for concrete. I could take it down to the basement then across to bypass a few walls, however being a GEC, the shorter the better. Running it on the exterior is out and due to the prefab concrete, I can't count on using the building steel. The old drawings are ambiguous and without reliable information, I can't use building steel.
One option I would like to explore but not exactly to code is panel feeders are all rigid pipe which are encased in the pour concrete. Before go and seek an engineers and AHJ's approval, my theory is bonding to the rigid feeder a near by panel. This would be the shortest route back to the MDP (providing proper bonding).Would this present a potential problem besides code would this not be no way possible to keep from even trying getting approval?
It's out of the box approach and the code is the box. I'm just trying to avoid a laborious process when there is in its self a very long run for a GEC. ensuring that it a safe and reliable installation. I'm not out anything on this project but time. It's the customer, ie the tax payer that will be footing the bill and I'm about safety and economics of any project
Is this idea dead before it started?