Precautions in operation of low voltage distribution box (5)

5. Improper installation of distribution box not only affects the appearance of the city, but also is vulnerable to external damage. It is suggested to select appropriate installation location comprehensively.

6. Some protective neutral power supply systems still use three-phase four wire power supply mode. The zero line of low-voltage power grid is long and the impedance is large. When the three-phase load is unbalanced, zero sequence current will pass through the zero line. At the same time, due to environmental deterioration, wire aging, moisture and other factors, the leakage current of the wire through the zero line also forms a closed circuit, resulting in a certain potential of the zero line, which is important for safe operation It's very bad.

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