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Release: March 25, 1999


NGK High Voltage Laboratory (Komaki-city, Aichi Pref.) operated by NGK INSULATORS, LTD. (President: Masaharu Shibata, Head Office: Nagoya) has been certified as a ISO/IEC Guide 25(*) qualified testing laboratory. In Japan, 59 laboratories mainly conducting mechanical and chemical testing, have already been certified; however, NGK High Voltage Laboratory is Japan's first qualified laboratory for electrical testing. The accredited scope includes high voltage testing regarding alternating current, direct current, lightning impulse and switching impulse. The inspection was conducted by JAB ( the Japan Accreditation Board for Conformity Assessment), and accreditation and registration followed on February 16, 1999.

In accordance with the globalization of companies' activities, it is becoming increasingly important that testing data, reports and proofs of traded products should abide by international standards. The accreditation system for testing laboratories evaluates if a laboratory, issuing such written materials, conforms to the international standards defined in Guide 25, and accredits, registers and publicizes such laboratory. This system enables testing data issued by an accredited laboratory to be certified internationally. In addition, when the traded products require testing reports provided by a third party, an accredited laboratory can provide highly reliable testing data. To earn this accreditation, a laboratory must completely meet diversified demands, such as organization, management, quality management system, employees, testing facility, traceability, and record system. The accreditation of NGK High Voltage Laboratory at this time is due to its superior testing ability, supported by its quality management system abiding by international standards and its measuring system which is traceable to both national and international standards.

Outline of NGK High Voltage Laboratory

Since its establishment in February 1963, NGK High Voltage Laboratory has engaged in R&D for insulators and insulator assemblies. The laboratory is equipped with the world's most advanced level facility which can test actual-size insulator assemblies of up to 1000kV-level. Besides this, the laboratory can implement various tests by creating severe weather conditions; for instance, artificially simulating lightning strikes on insulators, or producing mist to pollute surfaces of insulators which are coated beforehand with salt, ash and dust.

* Address: Tagami, Hutaebori, Komaki-city, Aichi prefecture
* Plottage: 28,500 square mater
* Building area: 9,500 square meter
(1,650 kV alternating voltage generator)
* Main facilities: UHV Contamination Hall
(testing facility for polluted insulators for 1,000kV alternating current and 750kV direct current)

(*) "General Requirements for the Competence of Calibration and Testing Laboratories", agreeed upon and regulated by ISO (International Organization for Standardization) and IEC (International Electrotechnical Commission), and equivalent to JISZ9325 of national standards.

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