Ground wire should be multi-stranded bare soft copper wire, cross-sectional area of not less than 25mm2 from where the provisions of the

From the provisions of the lead wire.

According to the different levels of lightning protection of buildings, lightning protection of lead wires are not the same. A lightning protection building dedicated lead wire, the number of roots should not be less than two, the spacing should not be greater than 18 m;

Second level of lightning protection building the number of lead wires should not be less than two, the spacing should not be greater than 20 m;

Third level of lightning protection building, lightning protection device dedicated lead wire, the number of lead wires should not be less than two, the spacing should not be greater than 25 mm.

Lead wire Should be laid along the building wall, and should avoid bending, through the shortest way to ground. High architectural requirements can be dark laying, but the cross-sectional area should be increased by one level. Metal components of the building (such as fire ladders, etc.) can be used as a lead, but all metal components should be connected to the electrical path, and reliable connection.

The use of multiple lead wires, in order to facilitate the grounding resistance and check the lead wires, grounding wire connection, it is appropriate to set up in the lead wires from the ground at a height of about 1.8m disconnect card.

When using multiple lead wires, the first and second category of lightning protection buildings should be at least two lead wires, the distance between them shall not be greater than 12m and 18m; third category of lightning protection building perimeter of more than 25m or height of more than 40m, there should be two lead wires, the distance between them shall not be greater than 25m.

Baidu Encyclopedia - lead wires