scjohn,
Our company is on the "other side of the fence" in a big way.
We've got 2 large auto dealerships going that bid early last summer. They started in September, and should be done by the end of this coming summer.
One has no steel conduit at all in yet, and neither has any copper in.
We'll not be "reengineering" the job in any way. It will go in as originally agreed.

I agree with iwire's last post 100% (gee, twice in the same day!)
Good luck