I don't think there is any equipment in normal use that has "DC leakage" as such. That would imply a semiconductor between L & E which is not going to pass the likes of class-Y safety for a capacitor under impulse over-voltage, etc.
As mentioned above, this is only going to show under double-fault conditions, such as an open CPC on a washing machine with a DC drive and a motor insulation fault to earth.
EV chargers are a bit of an exception, as they have a big DC power source and are often in wet areas with the true Earth present.
PV install possibly as well, though the inverters tend to monitor the panel's insulation resistance and shut down otherwise. Also PV setups should be properly earthed by the fixed wiring, where as cars depend on plug/socket/flexible cables.
As mentioned above, this is only going to show under double-fault conditions, such as an open CPC on a washing machine with a DC drive and a motor insulation fault to earth.
EV chargers are a bit of an exception, as they have a big DC power source and are often in wet areas with the true Earth present.
PV install possibly as well, though the inverters tend to monitor the panel's insulation resistance and shut down otherwise. Also PV setups should be properly earthed by the fixed wiring, where as cars depend on plug/socket/flexible cables.