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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For these levels, there are three different design methods for achieving protection protection angle method, mesh method, and rolling sphere method. Design method using lightning-strike risk assessment.

The State of Standard JIS A

Our findings showed it to be superior to the other methods. In JIS A 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. High-speed and dependable access networks using optical fibers are becoming common now, and progress on an information and communications technology Z4201 society has accelerated.

When JIS A Therefore, we need to implement lightning protection that applies lightning-strike risk assessment, not according iis a uniform means of lightning protection, but on a case-by-case basis. Currently, he is mainly engaged in solutions engineering for data-center, A201, power source, and lightning protection solutions.

Lightning protection requires a synthetic measure against the various break-in paths of lightning surges, which are shown in Fig. He was a visiting his at the University of Technology in Malaysia in and helped to establish the Malaysian standard for lightning protection for Jiis systems.

He has been in his present post since This requires advanced research on risk management technology for lightning protection. Therefore, we have developed and used diagnostic tools for the external lightning protection systems of NTT Facilities.

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. 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.


Diagnostic tools for external lightning protection Various laws and specifications such as those of JIS A He is currently engaged in lightning protection solutions. This method can provide designs that are both economical and effective in terms of lightning protection.

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

Moreover, the break-in path of lightning surges is being complicated by the diversification of networks and equipment connection configurations Fig. As the dependence on information and a401 increases, companies and society will face a high risk of damage from system failures, and the damage itself could be extremely severe.

After the technical requirements of JIS A Based on the design decision data jus in Fig. He is a member of the Institute of Electrical Engineers of Japan. This can be achieved after evaluating the occurrence probability of flashes to the sides of structures using the rolling sphere method based on IEC He joined NTT Facilities in He is currently studying lightning protection technology.

This method is based on JIS A Although all of the sidewalls of structures taller than the rolling sphere radius jix protected at each of the four protection levels, their lightning-strike risk, i. It was also recognized that designs conforming to JIS A However, the standard has a serious drawback in that it does not take into consideration flashes to sidewalls. We would like to emphasize the importance of implementing comprehensive lightning protection that provides not only external but also internal lightning protection.

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

NTT Facilities will continue to develop technology for comprehensive lightning protection that will take into consideration the latest technology trends. 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.


We were able to reduce the renovation costs by about one third compared with a design based on JIS A Hopefully, relevant laws and regulations his various codes and standards will be enacted.

Our 3D Lightning Protection Diagnosis System applies calculation logic in accordance with JIS A both andand it can easily indicate the areas of a structure protected by an air-termination system. Toshima-ku,Japan Email: Break-in path of lightning surges. However, JIS A He moved to NTT Facilities in It can then present the analysis results in a 3D visualization. Although the theory of lightning is being elucidated, complete protection against lightning damage is still difficult to achieve with present technology.

However, the scope of this article focuses on the protection of structures against lightning. Consequently, the importance of lightning protection Fig. Therefore, we designed the air-termination system uis our method. Points of JIS A revision. Because of the importance and value of the facilities that we are dealing with aa4201 the impact on society of damage to them, we need to apply lightning protection based on risk management to reduce the potential for damage effectively and economically.

Therefore, the importance of high reliability for the Jiss Internet protocol network infrastructure, which supports the progress of our information society, is growing steadily.

Therefore, the IP network infrastructure is now more vulnerable to lightning damage, and the problems caused by lightning damage have increased [1]. Importance of lightning protection. Diversification, advanced features, and complexity are being pursued to enable the IP network infrastructure to provide us with greater benefits. You need Adobe Reader 7.