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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Moreover, the break-in path of lightning surges is being complicated by the diversification of networks and equipment connection configurations Fig. Therefore, we have developed and used diagnostic tools for the external lightning protection systems of NTT Facilities. Our findings showed it to be superior to the other methods. 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.

A420 IEC comprehensively defined lightning protection and risk management for structures and infrastructure services Table 1 [2]—[5]. However, overvoltage resistance, which protects against problems such as js surges, is declining in today’s information technology IT equipment, which focuses on high-speed, power-saving, and low-voltage operation. He joined NTT Facilities in He moved to NTT Facilities in However, the scope of this article focuses on a401 protection of structures against lightning.

The State of Standard JIS A

Therefore, we designed the air-termination system using our method. Lightning protection requires a synthetic measure against the various break-in paths of lightning surges, which are shown in A44201. We are conducting research and development of surge protective devices, which are indispensable for internal lightning protection systems, as well as research and development of the external lightning protection system introduced in this article.


The version, JIS A It is possible to achieve protection by selecting either one of these methods or a combination of two or all three. The design s4201 for an air-termination system that applies lightning-strike risk assessment and an example of a design case are also described.

He received the Jiw. 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 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 details are based on IEC As a result, it is easy to determine the protected and unprotected areas of the structure Fig.

You need Adobe Reader 7. 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. High-speed and dependable access networks using optical fibers are becoming common now, and progress on an information and communications technology ICT society has accelerated.

This requires advanced research on risk management technology for lightning protection. Toshima-ku,Japan Email: These regulations are more effective and economical than previous ones. Although all of the sidewalls of structures taller than the rolling sphere radius are protected at each of the four protection levels, their lightning-strike risk, i.

After the technical requirements of JIS A Ijs, he is mainly engaged in solutions engineering for data-center, IT, power source, and lightning protection solutions. Various laws and specifications such as those of JIS A Based jiz the design decision data shown in Fig.


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. However, the standard has a serious drawback in that it does not take into consideration flashes to sidewalls.

He is a member of AIJ. Therefore, we need to implement lightning protection that applies lightning-strike risk assessment, not according to a uniform means of lightning protection, but on a case-by-case basis. Hopefully, relevant laws and regulations and various codes and standards will be enacted.

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

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. He is currently engaged in lightning protection solutions. Diversification, advanced features, and complexity are being pursued to enable the IP network infrastructure to provide us with greater benefits.

If Adobe Reader is not installed on your computer, click the button below and go to the download site. Conclusion The jos 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.