Tripping mcb problem

andrew2022 said:
in the pic, can i ask y there are 2 reds in the same terminal, yet there is a terminal to the side, designed for that other wire
Good point. Thanks, I will fix that tomorrow.
 
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Maybe it used to be a TT, and therefore had a 100mA Type-S/30mA split CU, and then got converted to TN-C-S, but the CU wasn't changed?
 

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