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1. The main soil should not far from the main switch cabinet much.
2.The ground is used to settle good soil should be the soil biological There is no sand or limestone, and should not be an obstacle, such as a column, wall or concrete slabs in ดินขวางกั้น distribution of electric charge 3 ground.
.Soil moisture is better than dry soil. But there's no flooding.
4. If the ground state unfavorable may require more than the main soil 1 rods. Embroidery and distance equal to the length of the main ground connected to each other.
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