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 version, JIS A This in turn requires appropriate lightning protection standards and risk assessment design methods. 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. Design technology for external lightning protection systems Lightning protection requires a synthetic measure against the various break-in paths of lightning surges, ijs are 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. This can be achieved after evaluating the occurrence probability of flashes to the sides of structures using the rolling sphere method based on IEC Thus, both versions of JIS A are currently still in legal use, though in practice they cannot be combined.

He was a jus professor at the University of Technology in Malaysia in and helped to establish the Malaysian standard for lightning protection for IT systems.

Diversification, advanced features, and complexity are being pursued to enable the IP network infrastructure to provide us with greater benefits. 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. However, the scope of this article focuses on the protection of structures against lightning.

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

Although the theory of lightning is being elucidated, complete protection against lightning damage is still difficult to achieve with present technology. It can then present the analysis results in a 3D visualization. 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.


Design case using lightning-strike risk assessment. This article describes technology for designing an external lightning protection system for a telecommunications ijs in accordance with the latest international standards for lightning protection.

JIS A – Wikidata

It was also recognized that designs conforming to JIS A This method can provide designs that are both economical and effective in terms of lightning protection. Currently, he is mainly engaged in solutions engineering for data-center, IT, power source, and lightning protection solutions.

Importance of lightning protection. Design method using lightning-strike risk assessment. 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 Therefore, for an air-termination system, we need a design method that takes into account lightning-strike risk assessment.

Then, based on the results, the lightning-strike probability x4201 the economic efficiency were weighed for designs with the following bases: Conclusion The number of different structures is as large as the jia of structures itself because each structure is jls unique combination of its internal electrical systems, the function of the structure, and the a2401 appearance. He moved to NTT Facilities in and worked on a PHS base station construction promotion project and on a data-center construction task-force.

However, JIS A The IEC comprehensively defined lightning protection and risk management for structures and infrastructure services Table 1 [2]—[5]. Hopefully, relevant laws and regulations and various codes and standards will be enacted.


He has been in his present post since Break-in path of lightning surges. 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.

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. 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.

Thus, jjis 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 method is based on JIS A It is possible to achieve protection by selecting either one of these methods or a combination of two or all three.

He is currently engaged in electrical system design and management. Our design procedure was as follows. Nis, the standard has a serious drawback in that it does not take into consideration flashes to sidewalls.

The State of Standard JIS A

Moreover, each method is regulated according to the protection level. The number of different structures is as large as the number of structures itself because a421 structure is a unique combination of its internal electrical systems, the function of the structure, and the building’s appearance.

He moved to NTT Facilities in Various laws and specifications such as those of JIS A 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. Toshima-ku,Japan Email: