Generator back feed breaker in a homeline sub panel
I'm interested in getting a sub panel set up to transfer from the main(s) supply to a generator back feed breaker. I'd want a 100amp or 125 amp sub panel and I want to service a number of selected circuits (one at 240V; the others at 120V) from the panel. I expect to wire this panel to my generator and have it ready to service the selected circuits when I lose power from the mains.
Wiring up a generator is more straightforward when the portion of the circuits to be generator powered are all in a subpanel.
You will have a breaker pair in the main panel to forward-feed the subpanel.
Run the cable from this breaker pair to one leg of the transfer switch. Run the generator feed to the other leg. Run the subpanel feed cable (also forward fed to top of subpanel) to the transfer switch common.
This transfer swittch should have three poles so the neutral between the main panel and the subpanel is switched along with the hots.
The good conscientious technician or serviceperson will carry extra oils and lubricants in case the new pump did not come with oil or the oil was accidentally spilled, so the service call can be completed without an extra visit.