I need to define three different earth symbols for my schematic

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I need to define three different earth symbols for my schematic. They are protective earth, normal earth (0V for all circuits) and one isolated earth for a part that is optically isolated from the rest.

Is there some rules about choosing earth symbols?
 


tpetar said:
What is "one isolated earth for a part that is optically isolated from the rest." ?
Click to expand...

It is an earth (0V) for the circuits on the other side of the optically isolated part of the schematic.
 

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