05-16-2015, 08:05 AM
A proper "transfer switch" is two sets of breakers with a physical interconnect such that only one set can be "on", each set is connected to one source (grid, generator), the common bus then feeds the (original) main breaker. I think I've seen them at Home Depot.
When permitted and installed by a licensed electrician, it satisfies the insurance company lawyers, because it is physically impossible to backfeed the grid, and operation of the transfer switch is intuitively obvious.
When permitted and installed by a licensed electrician, it satisfies the insurance company lawyers, because it is physically impossible to backfeed the grid, and operation of the transfer switch is intuitively obvious.