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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The design method for an air-termination system that applies lightning-strike risk assessment and an example of a aa4201 case are also described. As a result, it is easy to determine the protected and unprotected areas of the structure Fig.

Thus, both versions of JIS A are currently still in legal use, though in practice they cannot be combined. Furthermore, we are also developing an External Lightning Protection Design Support System that includes a function for outputting a 2D engineering drawing for the external lightning protection system to the 3D Lightning Protection Diagnosis System. Therefore, for an air-termination system, we need a design method that takes into account a201 risk assessment. He joined NTT in and worked on the maintenance, design, and construction of power equipment.

After the technical requirements of 4a201 A Break-in path of lightning surges. Therefore, we have developed and used diagnostic tools for the external lightning protection systems of NTT Facilities.

This requires advanced research on risk management technology for lightning protection. Thus, to determine the protected area of a structure, we need a design that provides a more complex calculation and intricate operation than that provided by only the protection angle method of JIS A Hopefully, relevant laws and regulations and various codes and standards will be enacted.

Although all of the sidewalls of structures taller than the rolling sphere radius are protected at each of the four 4a201 levels, their lightning-strike risk, i.

Design technology aa4201 external lightning protection systems Lightning protection requires a synthetic measure against the various break-in paths of lightning surges, which are shown in Fig. This method can provide designs that are both economical a401 effective in terms of lightning protection.


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.

Importance of lightning protection. Toshima-ku,Japan Email: The IEC comprehensively defined lightning protection and risk management for structures and infrastructure services Table 1 [2]—[5].

First, the required level of lightning protection was established, and the occurrence probability of side flashes was calculated for all lightning currents having a ijs of a lightning-strike exceeding the lightning current based on each of the lightning protection levels the details are based on IEC This can be achieved after evaluating the occurrence probability of flashes to the sides of structures using the rolling sphere method based on IEC These technical requirements have become JIS A Therefore, the importance of high reliability for the IP Internet protocol network infrastructure, which supports the progress of our information society, is growing steadily.

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. This article describes technology for designing an external lightning protection system for a telecommunications building in accordance with aa4201 latest international standards for lightning protection.

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 jls, the function of the structure, and the building’s appearance.

It is possible to achieve protection by selecting either one of these methods or a combination of two or all three. These regulations are more effective and economical than previous ones. Various laws and specifications such as those of JIS Nis This in turn requires appropriate lightning protection standards and risk assessment design methods.

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

You need Adobe Reader 7. Conclusion 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.


Next, after taking into consideration the requests of the building owners, the surrounding environments, and the importance of the structures, we checked the validity of our design method. Consequently, the importance of lightning protection Fig.

The State of Standard JIS A

He is currently studying lightning protection technology. Moreover, the break-in path of lightning surges is being complicated by the diversification of networks and equipment connection configurations Fig. Moreover, each method is regulated according to the protection level.

Diversification, advanced features, and complexity are being pursued to enable the IP network infrastructure to provide us with greater benefits. Design method using lightning-strike risk assessment. He was a visiting professor at the University of Technology in Malaysia in and helped to establish the Malaysian standard for lightning protection for IT systems. 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 He is a member of the Institute of Electrical Engineers of Japan.

International Electrotechnical Commissionwhich is a new international standard that includes risk management technology for lightning damage, was published in January 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.

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Design example In one design case, we designed improvements to an existing external lightning protection system using our design method for a structure nearly m high.