Note the wiring points of the circuit breaker

For those engaged in electrical work, dealing with electrical equipment should be routine. But even so, sometimes it is inevitable to make mistakes, on the circuit breaker wiring matters, for professional electricians is simply a pediatrics, but here or a little emphasis on the relevant matters for attention, but also to some "layman" popularize the basic knowledge.
General circuit equipment, there are power and load signs, in the actual process of wiring, according to the signs on the line, do not connect the two reverse.
The control switch or protection cable must not pass through the current transformer. If the three-phase five-wire system or single-phase three-wire system is used, the protection cable must be connected to the protection main line at the inlet end of the leakage circuit breaker. For single-phase lighting circuits, three-phase four-wire distribution lines, and other lines or devices that use working neutral lines, the neutral line must pass through the current transformer.
In the system where the neutral point of the transformer is directly grounded, once the leakage circuit breaker is installed, the working neutral line can only be used as the working neutral line after passing through the current transformer. It cannot be repeatedly grounded or connected with the working neutral line of other lines. The electrical equipment can only be connected to the load side of the leakage circuit breaker. One end is not allowed to be connected to the load side, and the other end is connected to the power side.