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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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. Diversification, advanced features, and complexity are being pursued to enable the IP network infrastructure to provide us with greater benefits.

Our findings showed it to be superior to the other methods.

The State of Standard JIS A

Toshima-ku,Japan Email: Next, after taking into consideration the requests of the building owners, the surrounding environments, and the importance of the structures, we checked the validity of our design method. 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 jiw to the protection level required by JIS A However, the standard has a serious drawback in that it does not take into consideration flashes to sidewalls.

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

He is currently studying lightning protection technology.

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Moreover, the break-in path of lightning surges is being complicated by the diversification of networks and equipment connection configurations Fig. Therefore, jia IP network infrastructure is now more vulnerable to lightning damage, and the problems caused by lightning damage have increased [1]. The version, JIS A He joined NTT Facilities in Then, based on the results, the lightning-strike probability and the economic efficiency were weighed for designs with the following bases: The IEC comprehensively defined lightning protection and risk management for structures and infrastructure services Table 1 [2]—[5].


He moved to NTT Facilities in Based on the design decision data a4021 in Jia. Design method using lightning-strike risk assessment. If Adobe Reader is not installed on your computer, click the button below and go to the download site.

Moreover, each method is regulated according to the protection level. 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.

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. Importance of lightning protection.

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 jiss only the protection angle method of JIS A 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. This method is based on JIS A Need for risk assessment Although the theory of lightning is w4201 elucidated, complete protection against lightning damage is still difficult to achieve with present technology.

Diagnostic tools for external lightning protection Various laws and a420 such as those of JIS A In one design case, we designed improvements to an existing external lightning protection system using our design method for a structure nearly m high.

Lightning protection requires a synthetic measure against the various break-in paths of lightning surges, which are shown in Fig. He is currently engaged in electrical system design and management. Points of JIS A revision. Although the theory of lightning is being elucidated, complete protection against lightning damage is still difficult to achieve with present technology.

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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 High-speed and dependable access networks using optical fibers a421 becoming common now, and progress on an information and communications technology ICT society has accelerated.

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 jus lightning protection based on risk management to reduce the potential for damage effectively and economically. Design case using lightning-strike risk assessment.

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

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

These technical requirements have become JIS A Our design procedure was as follows. It can then present the analysis results in a 3D visualization. When JIS A This can be achieved after evaluating the occurrence probability of flashes to the sides of structures using the rolling sphere method based on IEC