Balanced Load
I use an interlock setup on my panel. I prefer it to a transfer switch with a limited number of circuits available. With the interlock you can use of any circuit with in reason. One important aspect of setting up the panel is to balance the load on each "leg" L1 and L2. As you go down the panel each breaker is on a different Leg. You do not want two heavy Load appliances on the same leg, say the electric stove and a well pump. It takes more time moving breakers around to get a balanced load than installing the interlock, running the cable from the outside receptacle and wiring the panel.
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