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Thanks for the response, RetroTechie.
Again, you are correct, the circuit will work fine with the AC HOT & Neutral swapped, (except for the latent safety issue).
The analysis re: lifetime safety is also bang on. However, give a guy a screwdriver, and you can certainly get inside an old TV -...
Thanks for the response.
None of the conductors in question is accessible, except during installation &/or servicing.
I agree that the BEST option is a fully isolated design.
The relay option is not my solution, but one that I'm required to evaluate.
If a relay were used, I'd prefer it be...
We have a design that uses a NON-ISOLATED power supply. By this I mean that we generate 5VDC from 120VAC, but the local "ground" reference for 5VDC is the AC neutral.
This works fine when wired properly (120VAC HOT wired to the "HOT" terminal, Neutral connected to the neutral terminal).
However...
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