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Hello, this can only be the input where the wire is adjusted,
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You can lower the line on the main switch.
Here's a diagram to show you: read it and you'll understand. >>>More
From your description, you can see if the live and neutral wires of the main power supply line are connected together. There are only two possibilities, one is that its power supply switch automatically trips to protect the entire power supply network. Second, the wires quickly caught fire and burned. >>>More
Theoretically, yes, but have you installed a 2P (zero fire) leakage protection switch? If it is installed, it will not be, and the leakage protection switch will detect as leakage (zero, fire current unbalance), and it will protect the trip.
The neutral wire needs to be connected from the power supply, for example, if there is a neutral wire from a nearby outlet, you can split a wire out.
Don't deal with it, if the switch controls the live wire, when the switch is turned on, both wires will be electrified. The two wires of the switch, one is the live wire, and the other is the control wire, which is not the neutral line.