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Sorry I was talking about DIY installation . People can install standby generator if they get city permit cost over 500 dollars and hire licensed electrician which is very expensive to install the transfer switch and then have the utility company approve the installation . The cost to install a transfer switch for a powerjack inverter will be more than the cost of inverter because of the permit and hire a licensed electrician . The main service panel is outside so it is impossible to hide the transfer switch . Code violation is very expensive in Arizona . Your forum on grounding is the correct way as all metal case should should be grounded to avoid being electrocuted .
And there is the stupidity of the city at work when they require the panels to be outside. The county down here tried that at one point till we had a Hurricane. Then they heard a lot of complaints from people about not being able to get to a panel until after the storm. They have also heard complaints about it because of theft/vandalism. Our big transfer switch is outside. Our small one for emergency circuits is inside next to the main panel and the emergency circuit sub-panel. We also have a wire gutter coming out of our main panel instead of individual conduits and then the conduits feed out of the bottom/top of that gutter. Which isn't the norm but was approved by the county after they checked the codes. And there is no Romex anywhere in the house.
All your house wiring is armoured?