When building the wall, the reserved hole shall be about 20mm larger than the length and width of the distribution box. The invention discloses a construction method of a reserved line hole of a distribution box slot, which comprises the following steps: s1, placing the prefabricated part at a preset position when building a wall; s2, building a brick body along the periphery of the prefabricated member to support. The installation height of the distribution electrical box should be controlled at 1. 5 meters, which is convenient for operation and maintenance. Wire color: The neutral wire is blue, and the color of the phase wire (A phase is yellow, B phase is green, and C phase is red). mm (minimum) in length on cable connection side as shown in the drawings. In 63 / 100 / 160 / 315 KVA distribution box, the cross se the Isolator with cross section as mentioned above throughout the length.
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