I need to define three different earth symbols for my schematic

[swen_s]

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]

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?

https://www.incompliancemag.com/ind...ding-symbols&catid=66:on-your-mark&Itemid=204

What is "one isolated earth for a part that is optically isolated from the rest." ?

Normal Earth is not 0V.

 

[swen_s]

What is "one isolated earth for a part that is optically isolated from the rest." ?

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

 

[tpetar]

Can you post schematic.