Lightning arrester is lightning arrester grounding system. Air terminal is designed to receive direct lightning (lightning) metal object. Air terminals metal rod, called a lightning rod. Lightning arrester wires, known as overhead ground wires or lightning. Air terminals metal band, metal mesh, called lightning belt. All air terminals must go through the grounding device connected to ground deflectors. Air terminal by a combination of various forms, or any one of the following from: Independent lightning rod; lightning rod installed directly on the building, or lightning with a net; permanent metal roofing and metal roof; reinforced concrete members. In addition to the use of reinforced concrete elements, the air terminals should be plated (dip) zinc, welding should be painted anti-corrosion paint. In corrosive place, but also due to increase its cross-section, or take other anti-corrosion measures. Determined in accordance with the scope of protection of air terminals grounder law. Bowls law is suppose to a certain radius of the sphere along the need to prevent the rolling cloud-site, only when the ball touches the receptor, and the ground, without touching the need to protect the site, the part of the air terminals get protection . Mechanical and electrical equipment installation, Changzhou non-standard machinery manufacturing, steel machine www.lyjngjgc.com nine cattle