Hi I am responsible for keeping a 100 yrs old school up and running, The panels was upgraded around 15 yrs ago, with CHINT 30mA combined GFCI/circuit breakers and when I got an unstable ground fault in a high power pump system up to 16 GFCI's was activated around in the building. I am not sure if other makes had done the same, but it was pretty frustrating. The old-fashioned power supply is a 3x 230V system pretty equal to the US 240 3 phase like this: https://i.sstatic.net/ZVZmz.png
