Find the most up-to-date version of JIS A at Engineering Japan’s largest platform for academic e-journals: J-STAGE is a full text database for reviewed academic papers published by Japanese societies. JIS A Protection of structures against lightning (FOREIGN STANDARD). Available for Subscriptions. Content Provider Japanese Industrial Standards.

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As the dependence on information and telecommunications increases, companies and society will face a high risk of damage from system failures, and the damage itself could be extremely severe.

Diversification, advanced features, and complexity are being pursued to enable the IP network infrastructure to provide us with greater benefits. Our 3D Lightning Protection Diagnosis System applies calculation logic in accordance with JIS A both andand it can easily indicate the x4201 of a structure protected by an air-termination system.

Our design procedure was as follows. Conclusion The number of different structures z4201 as large as the number of structures itself because each structure is a unique combination of its internal electrical systems, the function mis the structure, and the building’s appearance. He is currently engaged in electrical system design and management. Moreover, each method is regulated according to the protection level.

Points of JIS A revision. Although all of the sidewalls of structures taller than the rolling sphere radius are protected at each a401 the four protection levels, their lightning-strike risk, i.

Using this 3D model, our diagnosis system can create a 3D model of a building to be protected and analyze the protected and unprotected areas according to the protection level required by JIS A This can be achieved after evaluating the occurrence probability of flashes to the sides of structures using the rolling sphere method based on IEC NTT has developed and applied a design method that incorporates lightning-strike risk assessment as the design method for air-termination systems of the NTT Group.


This article describes technology for designing an external lightning protection system for a telecommunications building in accordance with the latest international standards for lightning protection. Design technology for external lightning protection systems Lightning protection requires a synthetic measure against the various break-in paths of lightning surges, which are shown in Fig.

Design Technology for an External Lightning Protection System for a Telecommunications Building

Thus, more effective and economical lightning protection that applies risk assessment on a case-by-case basis, rather than uniform lightning protection, needs to be implemented. Therefore, we need to implement lightning protection that applies lightning-strike risk assessment, not according to a uniform means of lightning jiis, but on a case-by-case basis. Design method using lightning-strike risk assessment. Importance of lightning protection.

However, the scope of this article focuses on the protection of structures against lightning. The number of different structures is as large as the number of structures itself because each structure is a unique combination of its internal electrical systems, the function of the structure, and the building’s appearance.

He joined NTT in and worked on the maintenance, design, and construction a42201 power equipment. We present design technology that takes into consideration an assessment of the risk to an air-termination system, which is one element of an external lightning protection system that consists of a down-conductor system and an earth-termination system. Therefore, the importance of high reliability for the IP Internet protocol network infrastructure, which supports the progress of our information society, is growing steadily.

For example, when the rolling sphere method is selected, the sphere radius is specified as 20, 30, 45, or 60 m, according to the protection level. Therefore, for an air-termination system, we need a design method that takes into account lightning-strike risk assessment.

This in turn requires appropriate lightning a201 standards and risk assessment design methods. It can then present the analysis results in a 3D visualization. If Adobe Reader is not installed on your computer, click the button below and go to the download site. First, the required level of lightning protection was established, and the occurrence probability of side flashes was calculated for all lightning currents having a probability of a lightning-strike exceeding the lightning current based on each of the lightning protection levels the a42201 are based on IEC We were able to reduce the renovation costs by about one third compared with a design based on JIS A However, overvoltage resistance, which protects against problems such as lightning surges, is declining in today’s information technology IT equipment, which focuses on high-speed, power-saving, and low-voltage operation.


Thus, both versions of JIS A are currently still in legal use, though in practice they cannot be combined.

JIS A – Wikidata

He is currently engaged in lightning protection solutions. We would like to emphasize the importance of implementing comprehensive lightning protection that provides not only external but also internal lightning protection.

NTT Facilities will continue to develop technology for comprehensive lightning protection that will take into consideration the latest technology trends. The version, JIS A In one design case, we designed improvements to an existing external lightning protection system using our design method for a structure nearly m high.

Need for risk assessment Although the theory of lightning is being elucidated, complete protection against lightning damage is still difficult to achieve with present technology. Based on the design decision data shown in Fig.

Furthermore, we are also actively involved in standardization activities related to lightning protection in groups such as the IEC international standardization committee and the JIS draft-deliberation committee.