Firstly, check the number of down conductors, and then use a clamp type resistor for detection. Check whether the spacing meets the requirements, whether the layout is uniform, whether down conductors are set at edges and corners, and whether two main bars are selected for the down conductors of column reinforcement. Note: When using only the steel columns or column steel bars of surrounding buildings as down conductors for Class III buildings, down conductors can be set according to the span, and the average spacing between down conductors should not exceed 25m. When laying the down lead in an exposed manner, the material specifications, construction process, including connection form and quality, and anti-corrosion condition should be measured; The concealed down conductors shall be tracked and tested according to the concealed engineering records. In addition, it is also necessary to check if there are other electrical circuits connected to the down lead. Conduct a test on the resistance test terminal of the down lead, and measure the grounding resistance value at one measuring point per down lead. The exposed down lead (not a single) of the disconnection card should be disconnected for testing

Anti side impact mine detection

Check the height and distance of the first equalizing ring in high-rise buildings, the material specifications and laying methods of the equalizing ring, the connection status of large metal objects such as external walls, railings, doors and windows, and lightning protection devices, anti-corrosion measures, connection forms and quality (check the tracking and detection of hidden engineering records). Use a tester to measure large metals and measure their grounding resistance value against lightning protection. Each independent grading ring can measure 2 measurement points; Metal doors, windows, railings, and other external wall metal objects, as well as their reserved grounding, are measured at one point every two; Glass curtain wall every 10m × One measuring point per 10m