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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Importance of lightning protection. 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.

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

This can be achieved after evaluating the occurrence probability of flashes to the sides of structures using the rolling sphere method based on IEC 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.

He moved to NTT Facilities in and worked on a PHS base station construction promotion project and on a data-center construction task-force. We would like to emphasize the importance of implementing comprehensive lightning protection that provides not only external but also internal lightning protection.

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

Introduction High-speed and dependable access networks using q4201 fibers are becoming common now, and progress on an information and communications technology ICT society has accelerated. Points of JIS A revision. Our 3D Lightning Protection Diagnosis System applies calculation logic in accordance with JIS A both andand it can easily indicate the areas of a jus protected by an air-termination system.

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 The design method for an air-termination system that applies lightning-strike risk assessment and an example of a design case are also described. He is currently engaged in electrical system design and management. Design example In one design case, we designed improvements jid an existing external lightning protection system using our design method for a structure nearly m high.


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. Design method using lightning-strike risk assessment.

We were able to reduce the renovation costs by about one third compared with a design based on JIS A International Electrotechnical Commissionwhich is a new international standard that includes risk management technology for lightning damage, was published in January 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.

This in turn requires appropriate lightning protection standards and risk assessment design methods. Thus, both versions of JIS A are currently still in legal use, though in practice jix cannot be combined. If Adobe Reader is not installed on your computer, click the button below and go to the download site. You need Adobe Reader 7.

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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. This evaluation is a measure taken in addition to the design of an air-termination system based on the protection angle method of JIS A Then, based on the results, the lightning-strike probability and the economic jia were weighed for designs with the following bases: In JIS A After the technical requirements of JIS A Our design procedure was as follows.

Toshima-ku,Japan Email: 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.


Hopefully, relevant laws and regulations and various codes and standards will be enacted.

Jus on the design decision data shown in Fig. The version, JIS A 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. This requires advanced research on risk management technology for lightning protection. This method can provide designs that are both economical and effective in terms of lightning protection.

These technical requirements have become JIS A Because of the importance and value of the facilities that we are dealing with and 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. However, JIS A Currently, he is mainly engaged in solutions engineering for data-center, IT, power source, and lightning protection solutions.

He received the B.

Our findings showed it to be superior to the other methods. Diversification, advanced features, and complexity are being pursued to enable the IP network infrastructure to provide us with greater benefits. Therefore, the importance of high reliability for the IP Internet protocol network infrastructure, which supports the progress of our information society, is growing steadily. Therefore, we designed the air-termination system using our method.

It is possible to achieve protection by selecting either one of these methods or a combination of two or all three.

Design case using lightning-strike risk jks. Therefore, the IP network infrastructure is now more vulnerable to lightning damage, and the problems caused by lightning damage have increased [1].