Lightning is a highly destructive natural phenomenon, with pulse voltage amplitudes reaching millions of volts and instantaneous currents reaching hundreds of thousands of amperes, posing a serious threat to the safety of national and people's lives and property. Junhe Electronics Surge Protector reminds you that it is extremely important to do a good job in lightning protection. Today, the editor will take you to understand the inspection methods for the down lead of lightning protection devices
① Check the hidden engineering records of the down lead during the inspection ② Check whether the exposed down lead is taken as the shortest path, straight, and without sharp bends. Are the clips fixed in sections and able to withstand a vertical tensile force of 49N (5kg). Does the spacing between the support components of the down lead meet the requirements of 0.5m-1.5m for the horizontal straight section, 1.5m-3m for the vertical straight section, and 0.3m-0.5m for the curved section. Check if the welding points between the down lead and the lightning arrester and grounding device are rusted, if there are any omissions in the paint, and if there are protective facilities near the ground. The inspection method of using steel bars inside buildings as concealed down conductors is currently being studied During the inspection, a tape measure should be used to measure the distance between each adjacent two down conductors, and the total number of down conductors arranged should be recorded. Each down conductor is a detection point, and the inspection should be numbered in sequence ④ When checking the exposed down lead, use a vernier caliper to measure the size specifications of each down lead. If it is concealed, the inspected unit needs to provide architectural drawings ⑤ Check if there are any other electrical circuits attached to the exposed down lead. The distance between the exposed down lead and other nearby electrical lines should generally not be less than 1m ⑥ Check if the setting of the disconnect card meets the standard requirements
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