I like the idea of using low voltage high impedance AC supply during
debugging, may adopt that idea.

Would also still look at using opto isolation for extra safety.

PS how do I make outlook us bottom posting?

_______________________________________

Feel the power of the dark side!  
Atmel AVR

Roy Hopkins
Tauranga
New Zealand
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> Personally, I'd design the device to work of low-voltage AC or DC
during
> testing/debugging, then ramp up to full AC without the debugging kit.
But
> that's just me.
> 


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