Air terminal prices depend primarily on the quality of the material from which the air terminal is made. At this point, it is important that the selected product is anti-corrosive, does not rust, and is durable over a long period. Air terminals are one of the most important components of external lightning protection systems. A Faraday cage is essentially a mesh system created using air terminals. When selecting an air terminal, a correct risk analysis must first be performed in accordance with IEC 62305 standards. Based on the resulting risk analysis, the diameter of the rolling sphere is determined. In Part 3 of the standard, it is clearly stated which air terminal should be selected according to the area determined by the risk analysis.
In the visual below, the sphere diameter resulting from the risk analysis will be determined. As we always emphasize, another important issue is routing the down conductor by leaving the separation distance (s distance) or using an insulated conductor. You can learn how to calculate the s distance from this article.
Since passive air terminals comply with IEC standards, we at Yılkomer recommend passive air terminals for your facilities. We have explained the disadvantages of active terminals many times. Especially in explosive and flammable facilities, we believe that Faraday cage–passive terminal applications are the correct solution. For air terminal prices, you can contact us immediately and benefit from our correct project and engineering practices. In the video below, you can see an example of how a hospital is protected against lightning using a Franklin rod.