Requirement
1. The roof metal surface, facade metal surface, concrete reinforcement, metal door and window frames, and other large-sized metal parts of the building should be equipotentially connected together and connected to lightning protection grounding devices 2. The metal shielding layer of the shielded cable should be grounded at both ends and should be connected at the junction of various lightning protection zones, and connected to the lightning protection grounding device. If one end is required to be grounded, two layers of shielding should be adopted, and the outer shielding layer should be grounded at both ends 3. Metal pipes, metal grilles, or steel reinforced concrete pipes used for laying unshielded cables between buildings should be electrically connected at both ends and connected to the equipotential bonding strips of their respective buildings 4. Shielding materials should be made of steel or copper. When selecting boards, their thickness should be between 0.3mm and 0.5mm
Detection method
1 Use a milliohmmeter to check the electrical connections of shielding grids, metal pipes (grooves), anti-static floor support metal grids, large-sized metal parts, room roof metal keels, roof metal surfaces, facade metal surfaces, metal doors and windows, metal grilles, and cable shielding layers. The transition resistance value should not exceed 0.2 Ω. During the first inspection, use a vernier caliper to measure whether the specifications and dimensions of the shielding material meet the requirements of Article 4 of the inspection requirements 2. Calculate the shielding effectiveness of buildings using steel bars or specially designed shielding nets, as specified in 6.3.2 of GB50057-2010 3. The method for detecting electromagnetic shielding effectiveness using instruments is shown in Appendix F During the first inspection, it should be checked whether the construction according to the drawings meets the standard requirements
Function of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problemsBaijian and testing process:
1. Telephone communication and confirmation of requirements
2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:
1. The testing industry is fully covered, meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate
4. Free initial testing, with no testing fees charged
5. Self service order delivery for free on-site sampling
6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China