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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Furthermore, we are also developing an External Lightning Protection Jsi 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 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.

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

It q4201 possible to achieve protection by selecting either one of these methods or a combination of two or all three. He joined NTT in and worked on the maintenance, design, and construction of power equipment. Moreover, each method is regulated according to the protection level.

The IEC comprehensively defined lightning protection and risk management for structures and infrastructure services Nis 1 [2]—[5]. Based on the design decision data shown in Fig.

Diagnostic tools for external lightning protection Various laws and specifications such as those of JIS A This requires advanced research on risk management technology for lightning protection.

Thus, both versions of JIS A are currently still in legal use, though in practice they cannot be combined. It was also recognized that designs conforming to JIS A Jjs, JIS A 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.


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

He moved to NTT Facilities in These technical requirements have become JIS A Design case using lightning-strike risk assessment. Then, based on the results, the lightning-strike probability and the economic efficiency were weighed for designs with the following bases: He is a member of AIJ. However, the standard has a serious drawback in that it does not take into consideration flashes to sidewalls. For these levels, there are three different design methods for achieving protection protection angle method, mesh a420, and rolling sphere method.

Our design procedure was as follows. International Electrotechnical Commissionwhich is a new international standard that includes risk management technology for lightning damage, was published in January NTT Facilities will continue to develop technology for comprehensive lightning protection that will take into consideration the latest technology trends.

Ver Release | Chex | Construction Drawing Sharing Service

He is currently engaged in lightning protection solutions. This can be achieved after evaluating the occurrence probability of flashes to the sides q4201 structures using the rolling sphere method based on IEC Conclusion The number of different structures is as large as the number of structures itself because each structure is a unique jjis of its internal electrical systems, the function of the structure, and the building’s appearance.

This method can provide designs that are both economical and effective in terms of lightning protection. 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.

Toshima-ku,Japan Email: This method is based on JIS A Although all of the sidewalls of structures taller than the rolling sphere radius are protected at each jks the four protection levels, their lightning-strike risk, i.


JIS A – Wikidata

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. 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.

In one design case, we designed improvements to an existing external lightning protection system using our design method for a structure nearly m high. 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. The design method for an air-termination system that applies lightning-strike risk assessment and an example ijs a design case are also described.

Because of the a4210 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.

In JIS A However, overvoltage resistance, which protects against problems such as lightning surges, is declining in today’s information technology IT equipment, which focuses on high-speed, power-saving, and low-voltage operation.

Consequently, the importance of lightning protection Fig.

Moreover, the break-in path of lightning surges is being complicated by the diversification of networks and equipment connection configurations Fig. Therefore, we designed the air-termination system using our method. He received the B.