What are black and white lines?

The black line is the zero line, and the white line is used to control and measure the loop. The neutral line is a line drawn from the neutral point (N) of the secondary side of the generator or transformer, which forms a loop with the phase line (L) to supply power to electrical equipment and is mainly used for the working loop. Under normal circumstances, the neutral line and the protective ground wire (PE) are repeatedly grounded (PEN) at the neutral point (N) of the secondary side of the transformer, which plays a double protection role.

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