This design contained some specific methods-definition of grades for lightning protection,air-termination system,down-conductor system and earth-termination system,for example.

And through analysis on the equipment of absorb the lighting,down lead and earth equipment,it represents the characters of anti the thunder of lightweight steel construction and metal roofing,to gives reference to related projects.

This paper expounds the formation and the harms of the lightening, introduces some common measures forthe lightening protection of the high- rise buildings from aspects of the lightening receiver, grounding device, down lead,even damage ring, and electrical equipment protection, etc.

The Method and points for attention for using continuity tester of ground down lead to test the ground down lead of electrical equipment have been introduced,several test data have been analyzed and the reference value to determine the continuity state has been given.

In order to solve the unreliability problem in connecting caused by the use of ordinary bolt in ground down lead of power transmission line reinforced concrete pole,the deficiencies of the ordinary bolt are analyzed through typical examples,then one kind of new connecting bolt is designed specially according to the theory of the relation between resistance and contact face.