He wants to turn off main to run house via generator when power is out,but know when it comes back on.
This would be a code violation and would be dangerous to utility workers.
Advise the customer strongly to do the right thing as Scott has said.
You should not even consider helping this customer back feed a panel with a generator.
Besides the moral responsibility you have, you will be liable injuries to the utility workers that get blasted by a back feed.
