Answer
This specific product is to be wired to a manual transfer switch and not to be used to back feed into your panel where you can injure a utility worker working on the line. Even though you may turn off the main breaker you are continually connected to the neutral in the panel.
Suppose some appliance you are running has a hot to ground fault. (Not hot to neutral.) Now the hot side is grounded putting your neutral at 120v. Don't depend on the neutral-ground bond in your panel; it depends on too many iffy connections and may not even be required in some jurisdictions. Now you have a hot neutral wire running to your transformer on the pole. Any other fault that connects one
of the hot leads of that transformer to ground puts 120v across the secondary (neutral), which puts anywhere from 4000 to 13,000 volts back along the high voltage lines feeding the transformer. So, the breaker in the generator or the breaker in your panel won't trip immediately.
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