Projects with EGND, Where do I stipulate in PI Expert?

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I am designing a universal input open frame flyback.
Where do I tell PI Expert there is an EGND?
Mostly so it can help me design the EMI filter.


Since the AC input of the flyback circuit in PI Expert is two-port [line and neutral only], the EMI filter does not have a reference to earth ground. PI Expert does not support adding an earth ground to EMI filters for isolated flyback circuits.