Thank you !!
It is quite uncomfortable and risky having 360 V aboard, 
PUCK ISOLATION TRANSFORMERS.pdf (434.2 KB)
“…PE-s are effectively coupled together by the water and grounding systems(0v top reading)…”
Coupled together?
Before installing, I measured continuity from PEi to enclosure and it shows isolated.
What is the reason for the terminal PEi to exist? if it is connected to nothing…
I did disconnected PEi temporarily and verified all measured voltages remain the same, and found no changes.
As a curiosity, I attach a document related to PUCK TRANSFORMERS, where they recommend not to connect the PEi.
Any opinions regarding that ?