1. Check the introduction method of the low-voltage power line in the building where the electronic information system is located (provided by buried/overhead/transformer inside the building), measure the buried length of the low-voltage line introduced by the cable, and measure the equipotential connection status of the cable metal sheath or metal protective tube with the lightning protection device according to the method in Article 7.4 of this part. 2. Check the grounding method of the low-voltage power supply entering the electronic information system room. 3. Check the installation method (serial/parallel) and installation form (phase/ground wire, phase/neutral/ground wire) of the power SPD. 4. Check the settings of the power SPD in the following parts, record their positions and main technical parameters. 1) The low-voltage line is introduced into the incoming cabinet of the building where the electronic information system is located; 2) The transformer and low-voltage distribution cabinet are located in the building where the computer room is located, and there are low-voltage lines leading from this building to another building; 3) The transformer and low-voltage distribution cabinet are located in the building where the computer room is located, and there are no low-voltage lines leading out of this building; 4) Computer room UPS input distribution cabinet; 5) UPS output (or machine room equipment) distribution cabinet 6) Auxiliary equipment distribution cabinet in the computer room; 7) At the power supply of electronic equipment; 8) No shielding measures, provided from indoor to outdoor equipment AC and DC power sources; 9) Weak current shaft or weak current room; 10) Other outdoor distribution cabinets (panels). 5. Check the line length of the front and rear power supply SPD. 6. Measure the length of the SPD connecting wire (including the length of the overcurrent protection device, SPD, and grounding wire), and check the installation process of SPD. Measure the transition resistance value between the grounding terminal of the surge protector and the distribution PE busbar according to the method in Article 7.4 of this section. 7. Check the current status of SPD and the working status of degradation indicators. 8. Check the working status of the overcurrent protection device in the SPD circuit. Author: Shaanxi Weixin Lightning Protection Technology Co., Ltd https://www.bilibili.com/read/cv14303714/ Source: Bilibili
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