Where is a lightning rod usually located in a building? Why?
The buildings shall be classified into three categories according to the lightning protection requirements according to their importance, nature of use and possibility and consequence of occurrence of lightning accidents.
Building houses to shelter the wind and rain is an important advance in the peaceful life of man, but it does not obscure the lightning. For thousands of years, even temples, pagodas and churches have been struck by lightning. In history, although there is no lack of skilled craftsmen, seek the lightning of the surgery, but until the modern science and technology to clarify the nature of lightning, people are unable to avoid the harm of lightning. Today, effective lightning protection measures for buildings and various important facilities - lightning rods - were invented by American scientist Franklin. He used scientific experiments to prove that lightning is electrostatic discharge after high voltage, lightning arrester lightning protection technology will have a scientific foundation. Over the past 200 years, people's long-term practice has further proved that the lightning rod is reliable.
Tip. Because ray is up there. If the thunder was struck from the ground, it would not have been safe.
When the building is higher than 30m, should take the following measures to prevent sideswipe:1. from 30m onwards, at intervals of not more than 6m, along the building around the horizontal lightning belt, and with the lead line is connected; 2.30m and above the walls of railings, doors and windows and other larger metal objects and lightning protection devices.2. height of no more than 40m chimney, you can only set one lead line, more than 40m should be set two leads. A metal ladder that can be bolted or welded for use as a two wire guide. The metal chimney shall be used as the flash receiver and lead wire.
The highest position of the building is the top. The lightning rod is made according to the principle of the discharge of the tip. The charge is easy to accumulate at the tip of the object and form a discharge phenomenon
