Thanks, those keys word helped with the search. Found it:
"The way we built the P20 internal power delivery system and the low output impedance of the P20. Internal to the P20 is a series of gold plated thick copper buss bars connecting the AC receptacles together. This means there’s nearly nothing standing between the regenerator’s output and the receptacles delivering the power."
Great design for minimising leakage currents between PSU’s