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Keep in mind that a violation of the NEC may be enough of a reason for an insurance company to deny a claim for damage do to an unwanted electrical event, power surge, lightning strike and so on.
It is all about risk management. Even with the use of an isolation transformer there are still failure modes, however rare, that can pose a danger and potential issues with insurance.
The NEC spells out the correct method, it is up to you to decide how you do your implantation.
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