Testing is divided into initial testing and regular testing. The first inspection is divided into the inspection during the construction process of lightning protection devices for newly built, renovated, and expanded buildings, and the first inspection of lightning protection devices for buildings after they are put into use. Regular testing is conducted according to the prescribed cycle. During the construction process of lightning protection devices for newly built, renovated, and expanded buildings, the structure, layout, shape, material specifications, dimensions, connection methods, and electrical performance should be tested in stages. The first inspection of building lightning protection devices after being put into use should be carried out according to the requirements of the design documents. 4.2 Testing items: a) Classification of lightning protection for buildings; b) Lightning arrester; c) Downlead; d) Grounding device; e) Division of lightning protection zones; f) Lightning electromagnetic pulse shielding; g) Equipotential bonding; h) Surge Protection Device (SPD)
5 Testing Requirements and Methods
5.1 Lightning Protection Classification of Buildings
Buildings should be classified into three categories based on their importance, nature of use, likelihood and consequences of lightning accidents.. The classification method is determined in accordance with Chapter 3, 4.5.1, 4.5.2 of GB 50057-2010 and Appendix A of this standard. 5.2 Lightning arrester 5.2.1; Requirement 5.2.1.1 The arrangement of the lightning arrester should comply with the provisions of Table 1. When arranging the lightning arrester, the lightning rod, lightning strip, and lightning net can be used separately or in any combinationTable 1 Layout Requirements for Lightning Arresters of Various Lightning Protection Buildings
Lightning Protection Category of Buildings Rolling Ball Radius/m Lightning Arrester Grid Size/m First Class Lightning Protection Buildings 30 ≤ 5 × 5 or ≤ 6 × 4. Class II lightning protection buildings 45 ≤ 10 × 10 or ≤ 12 × 8. Class III lightning protection buildings 60 ≤ 20 × 20 or ≤ 24 × 16
5.2.1.2 The material specifications, structure, minimum section, and installation method of the lightning arrester should comply with the provisions of 4.2.4, 4.3.1, 4.4.1, and 5.2 in GB 50057-2010. 5.2.2 Testing 5.2.2.1 During the first testing, the concealed engineering records should be checked. The inspection of roof facilities should be within the range of direct lightning protection and comply with the provisions of 4.5.7 in GB 50057-2010. Check the electrical connection between the lightning arrester and other exposed metal objects on the top of the building, the electrical connection with the down lead, and the equipotential connection of the roof facilities. 5.2.2.2 Check whether the position of the lightning arrester is correct, whether the welded joints are full without any omissions, whether the anti loosening parts such as caps for bolt fixation are complete, whether the anti-corrosion paint applied to the welding part is complete, and whether the section of the lightning arrester is corroded by more than one-third. Check whether the lightning strip is flat and straight, whether the spacing between fixed brackets is uniform and reliable, and whether the spacing and height of the lightning strip fixed brackets meet the requirements of 5.2.6 in GB 50057-2010. Check whether each support component can withstand a vertical tensile force of 49N. 5.2.2.3 During the first inspection, the grid size of the lightning protection network should be checked to see if it meets the requirements of Table 1. The distance between the lightning arrester (network, line) of the first type lightning protection building and the protected building, wind cap, vent pipe, etc. should comply with the provisions of 4.2.1 in GB 50057-2010. During the first inspection, a theodolite or altimeter and a tape measure should be used to measure the height and length of the lightning arrester, as well as the length, width, and height of the building. The protection range should be calculated using the rolling ball method based on the lightning protection category of the building. 5.2.2.5 During the first inspection, check whether the material, specifications, and dimensions of the lightning arrester comply with the provisions of Chapter 5 of GB 50057-2010. 5.2.2.6 Check if there are any other electrical circuits attached to the lightning arrester. 5.2.2.7 During the first inspection, it is necessary to check whether the building's anti side lightning protection measures comply with the provisions of Article 4.2.4, Article 7, 4.3.9, and 4.4.8 of GB 50057-2010. 5.2.2.8 When using steel bars in parapets, waterproof layers, or insulation layers as concealed lightning arresters in low-rise or multi-story buildings, the surrounding environment of the building should be inspected to prevent potential accidents such as falling concrete fragments. Except for low-rise and multi-story buildings, other buildings should not use steel bars inside the parapet as concealed lightning arresters The lightning strip at the corner should be bent according to the architectural design, with an angle greater than 90 °, and the bending radius should not be less than 10 times the diameter of the round steel and 6 times the width of the flat steel. At the point where the lightning strip passes through the expansion settlement joint of the building, it should be curved to the side with a radius of 100mm. 5.2.2.10 When trees are outside the protection range of the lightning arrester of the first type lightning protection building, the clear distance between the first type lightning protection building and the trees should be checked, and the clear distance should be greater than 5 meters. 5.2.2.11 The lightning arrester of the chimney should comply with the provisions of 4.4.9 in GB 50057-2010
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