Not arguing the point on the interlock, just they wouldn't let me use the 2, 200 amp mains for a manual disconnect. What times we did need a generator, we'd just kick the main out on the main breaker box, and feed back through the welder plug in the shop. That's where the problem was, when people start their generator's, and forget to flip the main on the breaker box, doing like we did, feeding back out on the line.
I removed the one panel in the middle in the second pic, but left the other since it already had wire running to the house, waiting to be switched.
On the inside of the shop is the transfer switch. Picked up off of both sides of that switch in the trough over head. One going into the 200 amp. breaker box in the shop, and the other going out through the wall, into the 200 amp disconnect to the house.
There was some miscommunications between the electrical contractor, and the engineer as to a disconnect. So there shot about $600.00 for a box, & labor. Finished the rest myself changing it out & the manual transfer switch.
I did get flamed on here pretty good about using the sch. 40 "water pipe" instead of the electrical conduit. But, they didn't have the 22-1/2º angle fittings I needed to make the softer turns to make what I already had work, in conduit fittings. And not enough room to use the long sweep fittings. From what I gathered on a couple evenings of seeing the difference between the two, it seemed to come down to, color was the only difference, which started another argument... No problem, I can live with it. There are a few runs here that have been in ground, and above ground for over 30 years, and no deterioration so far.
If you note the safety light up on the pole. that was the engineer's idea. It is wired into the utility side, so as to let you know power has been restored, IF you happen to remember to flip the switch, when going to generator power.