GI and AC leakage

[claudio]

I don't think the GI is pushed into conduction because the voltage is too low for that. The 1.6V I measured was using the diode test facility with my 9V multimeter. The LEDs are barely lit, apparently they light fully when the isolator is conducting.

I don't know the particular brand of GI that you have but the RFI needs to go to ground. Some isolators incorporate a capacitor across the main terminals, this should help to conduct the AC but does not affect the DC operation.