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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Toshima-ku,Japan Email: 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.

Next, after taking into consideration the requests of the building owners, the surrounding 4a201, and the importance of the structures, we checked the validity of our design method. Then, based on jos results, the lightning-strike probability and the economic efficiency were weighed for designs with the following bases: Based on the design decision data shown in Fig. Moreover, each method is regulated according to the protection level.

Conclusion 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. 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.

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. Thus, both versions of JIS A are currently still in legal use, though in practice they cannot be combined. 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.

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. Our design procedure was as follows.

Ver Release | Chex | Construction Drawing Sharing Service

a44201 Lightning protection requires a synthetic measure against the various break-in paths of lightning surges, which are shown in 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.


However, 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.

First, the required level of lightning protection was established, and the occurrence probability of side flashes was calculated for all lightning currents having a probability of a lightning-strike exceeding the lightning current based on each of the lightning protection levels the details are based on IEC Importance of 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 Therefore, the importance of high reliability for the IP Internet protocol network infrastructure, which supports the progress of our information society, is growing steadily.

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. Therefore, we have developed and used diagnostic tools for the external lightning protection systems of NTT Facilities.

He received the B. 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 jiis an earth-termination system.

He has been in his present post since The IEC 4a201 defined lightning protection and risk management for structures and infrastructure services Table 1 [2]—[5]. If Adobe Reader is not installed on your computer, click the button below and go to the download site. Currently, he is mainly engaged in solutions engineering for data-center, IT, power source, and lightning protection solutions.

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. Design method using lightning-strike risk assessment. He moved to NTT Facilities in However, the scope of this article focuses on the protection jks structures against lightning.

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

Therefore, the IP network infrastructure is now more vulnerable to lightning damage, and the problems caused by lightning damage have increased [1]. 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.

He is a member of the Institute of Electrical Engineers of Japan. These regulations are more effective and economical than js ones.

He is a member of AIJ. Kis design method for an air-termination system that applies lightning-strike risk assessment and an example of a design case are also described. He moved to NTT Facilities in and worked on a PHS base station construction promotion project and on a data-center construction task-force.

It can then present the analysis results in a 3D visualization. He is currently studying lightning protection technology. NTT Facilities will continue to develop technology for comprehensive lightning protection that will take into consideration the latest technology trends.

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

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 ijs method of JIS A Various laws and specifications such as those of JIS A This in turn requires appropriate lightning protection standards and risk assessment design methods.

He is currently engaged in lightning protection solutions.

In JIS A This requires advanced research on risk management technology for 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.

The version, JIS A