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.
|Published (Last):||19 January 2016|
|PDF File Size:||13.69 Mb|
|ePub File Size:||8.77 Mb|
|Price:||Free* [*Free Regsitration Required]|
Various laws and specifications such as those of JIS A In JIS A Therefore, we designed the air-termination system using our method. This in turn requires appropriate lightning protection standards and risk assessment design methods. The IEC comprehensively defined lightning protection and risk management for structures and infrastructure jiw Table 1 —.
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 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.
Jks Electrotechnical Commissionwhich is a new international standard that includes risk management technology for lightning damage, was published in January 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.
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.
This can be achieved a2401 evaluating the occurrence probability of flashes to the sides of structures using the rolling sphere jsi based on IEC Although the theory of lightning ji being elucidated, complete protection against lightning damage a42001 still difficult to achieve with present technology.
Diversification, advanced features, and complexity are being pursued to enable the IP network infrastructure to provide us with greater benefits. For these levels, there are three different design methods for achieving protection protection angle method, mesh method, and rolling sphere method.
Ver Release | Chex | Construction Drawing Sharing Service
Design method using lightning-strike risk assessment. Toshima-ku,Japan Email: Currently, he is mainly engaged in solutions engineering for data-center, IT, power source, and lightning protection solutions. 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.
After the technical requirements of JIS A 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. Our findings showed it to be superior to the other methods. Our design procedure was as follows.
Thus, both versions of JIS A are currently still in legal use, though in practice they cannot be combined.
Design Technology for an External Lightning Protection System for a Telecommunications Building
NTT Facilities will continue to develop technology for comprehensive lightning protection that will take into consideration the latest technology trends. We would like to emphasize the importance of implementing comprehensive lightning protection that provides not only external but also internal 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.
Importance of lightning protection. 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 method is based on JIS A 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. You need Adobe Reader 7.
Therefore, the importance of high reliability for the IP Internet protocol network infrastructure, which supports the progress of our information society, js growing steadily. This method can kis designs that are both economical and effective in terms of lightning protection. 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.
He is a member of AIJ. 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.