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How to show earth fault for a system?

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dkace

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Hi all and a happy new year,

I want to represent an earth fault for a system. The earth line is connected to power's earth, then to Junction box enclosure, then to power line to main system. How can I show that by using the allready existing MC of the system? Will it work if I use on of the inputs for earth, another for +5VDC and constantly check the voltage difference, without using the 0V from the SMPC that feeds the MC?
In that case I think I have to use an extra suppressor since erath is linked to ~220V AC mains.
All ideas are welcomed,

Thanks, and best wishes to all,

D.
 

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