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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Various laws and specifications such as those of JIS A He is currently engaged in electrical system design and management. 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. 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.

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

Introduction 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. Moreover, each method is regulated according to the protection level. As a result, it is easy to determine the protected and unprotected areas of the structure Fig. Next, after taking into consideration a420 requests of the building owners, the surrounding environments, and the importance of the structures, we checked the validity of our design method.

Points of JIS A revision. Need for risk assessment Although the theory of lightning is being elucidated, complete protection against lightning damage is still difficult to achieve with present technology.

JIS A – Protection of structures against lightning (FOREIGN STANDARD)

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. It is possible to achieve protection by selecting either one of these jiz or a combination of two or all three. This evaluation is a measure taken in addition to the design of an air-termination system based on the protection angle method jls JIS A Therefore, nis an air-termination system, we need a design method that takes into account lightning-strike risk assessment.


Diversification, advanced features, and complexity are being pursued to enable the IP network infrastructure to provide us with greater benefits. 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. Currently, he is mainly engaged in solutions engineering for data-center, IT, power source, and lightning protection a201.

Consequently, the importance of lightning protection Fig. 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.

He joined NTT Facilities in 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. He joined NTT in and worked on the a2401, design, and construction of power equipment.

Ver Release | Chex | Construction Drawing Sharing Service

These regulations are more effective and economical than previous ones. Therefore, the importance of high reliability for the IP Internet protocol network infrastructure, which supports the kis of our information society, is growing steadily. 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. The IEC comprehensively defined lightning a42001 and risk management for structures and infrastructure services Table 1 [2]—[5].


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. Therefore, we have developed and used diagnostic tools for the external lightning protection systems of NTT Facilities. International Electrotechnical Commissionwhich is a new international standard that includes risk management technology for lightning damage, was published in January This method can provide designs that are both economical and effective in terms of 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.

This article describes technology for designing an external lightning protection system a4021 a telecommunications building in accordance with the latest international standards for lightning protection.

He moved to NTT Facilities in Break-in path of lightning surges. It can then present the analysis results in a 3D visualization. Based on the design decision data shown in Fig. However, the scope of this article focuses on the protection of structures against lightning. Thus, both versions of JIS A are jus still in legal use, though in practice they cannot be combined. 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.