National Standard GB/T 24479-2025 Technical Code for Lightning Protection of Lifts Officially Released
This standard is jointly formulated under the jurisdiction of the National Technical Committee for Elevator Standardization and the National Technical Committee for Lightning Protection Standardization of China. It is applicable to the lightning protection of traction and positive drive lifts, hydraulic lifts, escalators and moving walks installed in buildings, covering the lightning protection design of elevators in all scenarios such as super high-rise buildings, outdoor and mountainous areas. The core contents of the standard include: first, establishing the general design principles of elevator lightning protection, dividing the lightning protection zones of the elevator system according to the building lightning protection grade, elevator installation scenario and electrical system characteristics, clarifying the protection grade and protection measures of different lightning protection zones, and establishing the general design principles of "zoned protection, comprehensive lightning protection, layer-by-layer protection, safety and reliability"; second, refining the lightning protection zoning and protection requirements of the elevator system, formulating special technical requirements for direct lightning strike protection, lightning induction protection and lightning wave intrusion protection for the elevator machine room, shaft, car, control cabinet and landing station electrical equipment respectively; mandating that the elevator machine room must be within the direct lightning strike protection range of the building, and the elevator metal components, guide rails and car must be reliably connected to the building lightning protection and grounding system; third, improving the lightning protection specifications of the elevator electrical system, formulating special requirements for the selection, installation and parameter matching of surge protective devices (SPD) for the elevator power system, control system, communication system and intelligent monitoring system, clarifying the configuration standards of surge protective devices for different voltage levels and different functional circuits, to prevent lightning overvoltage from damaging elevator electrical equipment; fourth, clarifying the special lightning protection requirements for elevators in super high-rise buildings, formulating special technical specifications for vertical lightning protection zoning, equipotential bonding, segmented grounding of guide rails, and multi-level lightning protection of electrical systems for elevators in super high-rise buildings with a building height of more than 100m, solving the protection problems of lightning induction and potential counterattack in elevator shafts of super high-rise buildings; fifth, standardizing the lightning protection requirements for outdoor elevators and special elevators, formulating special requirements for direct lightning strike protection, grounding system, integrated waterproof and lightning protection design for outdoor installed observation lifts, inclined lifts and escalators; for special elevators such as explosion-proof elevators, hospital lifts and marine lifts, formulating special lightning protection specifications adapted to special scenarios; sixth, improving the lightning protection grounding and equipotential bonding requirements, clarifying the grounding resistance limit, grounding method and equipotential bonding network design requirements of the elevator system lightning protection grounding, mandating that the elevator guide rails, car, machine room metal components and electrical equipment shells must realize full-process equipotential bonding and be reliably connected to the building lightning protection grounding system; seventh, standardizing the installation, inspection and operation and maintenance requirements, formulating the installation and construction specifications, on-site inspection items and test methods of elevator lightning protection devices, clarifying the cycle and project requirements for daily inspection, regular detection and maintenance of elevator lightning protection devices, requiring that a comprehensive lightning protection performance test must be carried out before the thunderstorm season every year. The implementation of this standard has comprehensively standardized the lightning protection design and application of elevator systems in China, greatly reduced the risk of elevator failures, equipment damage and safety accidents caused by lightning disasters, and also promoted the integration of China's elevator lightning protection technology with international standards, providing standardized technical support for the export and application of China's elevator products in lightning-prone areas around the world.