Set one within 50 meters according to the continuation length of the automatic laminating machine, and it should be satisfied that the transition resistance on the laminating machine in the furthest point from the ground electrode does not exceed the requirement of 10 ohms. The ground resistance must not exceed 20 ohms. The ground electrode is buried at the highest point of the ground, and is not shallower than 50 cm above and below the ground. When filling, the new fill should be rammed.

        The vertical column of the automatic laminating machine is required to be vertical. The vertical error of each corner column shall not exceed 0.5%, and the neutral column shall not exceed 1%. The distance between the columns of the external laminating machine constructed in eight layers shall not exceed 2 meters. The vertical spacing is not more than 1.8 meters, and it is necessary to use the members to join together, tighten the bolts, and the longitudinal degree of the load-bearing bar must be supported on the cross bar.