OK more detail is needed.
location, Chainat province, small village near Noenkham.
Over the last year a lot of work has been done on the mains side of the system. A year ago the the regulator in the picture was installed.
I then left Thailand and due to Covid restrictions only came back last month.
While I was away electricians have been out 2 or three times culminating in the new mains connection.
while I was away the regulator kept tripping because of low voltage, as low as 115 at times, hence new connection from PEA.
Someone came along, said the connections were reversed “fixed it” and the regulator stopped tripping.
Also my family were getting shocks from the showers, that is when the ground earths were fitted, shocks stopped.
I only discovered the “warm patch last night by chance when I moved something.
Would the regulator read correctly if the LN reverse was on the mains side? I think the reversal must be from the regulator to the distribution board?
Switched off at the distribution box and the meter (15/45) did one revolution in 24 seconds, with the regulator switched off as well it took 2 min 20 seconds.
Hope this helps diagnose my risk and the problem