At what load is the leakage current quantified for a power supply?
Leakage is specified with Line/Neutral short and measure current between that and ground.  Factory tests set for 200uA limit for consumer products, less for medical.  Some standards accept 250uA per unit and 500uA per system.  They also allow 1.4*V for DC tests and additional 10% for reducing test time from 60 s to hold for 1 s with slow DC ramp.

It does not get affected by load Z but E field stress on primary is affected by secondary floating connected to earth ground.  If there is breakdown, it will leak in Hipot with catastrophic failure unless current limited in tester.  ( my fix)