国产偷v国产偷v亚洲张丽_五月亚洲丁香_a免费在线观看_欧美日本成人_丝袜中出制服人妻美腿_婷婷好紧好多水国产好硬_九九热精品在线播放_97超级在线人妻资讯_日韩精品视频观看_中文字幕无码笫一页

The difference between explosion-proof certification and explosion-proof qualification certificate

Explosion proof certification and explosion-proof qualification certificate are two concepts that are easily confused by many people. From the explanation on Baidu Baike, it can be understood that explosion-proof certification is the process of determining that equipment meets the requirements of explosion-proof standa……

After replacing the production license with the explosion-proof CCC certification, do we still need an explosion-proof qualification certificate?

Since the announcement issued by the State Administration for Market Regulation in July 2019 regarding the implementation requirements of the mandatory product certification management for explosion-proof electrical and other products, it has been almost two years now. Many enterprises producing explosion-proof electri……

What is coal safety certification?

Coal safety certification is the abbreviation for coal mine safety certification. In 2007, the State Economic and Trade Commission and the Coal Mine Safety Supervision Bureau issued the "Interim Measures for Safety Signs of Coal Mine Products" and other documents, implementing a safety production certificatio……

How to obtain the qualification certificate for explosion-proof electrical installation and maintenance?

Requirements and materials for obtaining qualification certificates for installation, maintenance, and repair of explosion-proof electrical equipment: 1. Business license and personal ID card; 2. No less than 3 people must undergo knowledge training on explosion-proof electrical equipment, pass the assessment, and obta……

What do the explosion-proof Ex label and coal safety MA label mean respectively?

What do the explosion-proof Ex label and coal safety MA label mean respectively? Many customers do not understand what the Ex and MA logos represent. As a professional explosion-proof testing and certification organization, Zhongnuo Testing provides a brief explanation for everyone. The Ex mark is an abbreviation for E……

How to renew the explosion-proof certificate when it expires?

What is the validity period of domestic explosion-proof certificates? End users of explosion-proof electrical products often face such problems. In fact, explosion-proof certificates have a validity period. Currently, the validity period of domestic explosion-proof certificates is generally 5 years. Each certificate ho……

Domestic explosion-proof certification agency

Type I (coal mine) certification authority: National Safety Mark Center for Mining Products: A. Administrative division: Under the jurisdiction of the National Safety Supervision Bureau. B. Job responsibilities: Undertake all work related to the management of safety signs for mining products, including certification, t……

Why should tempered glass be used for explosion-proof transparent parts?

Why should tempered glass be used for explosion-proof transparent parts? Transparent parts are a very important material for explosion-proof electrical equipment. When choosing transparent parts, customers always ask what material to use? Can glass be used? Is plastic okay? Below, Zhongnuo Testing will explain to you. ……

There are several types of explosion-proof certification

Explosion proof certification is the process of determining that equipment meets the requirements of explosion proof standards, conducting type tests and routine tests, and issuing relevant certificates of conformity. The certificate can be specific to Ex equipment or Ex components. Equipment and protective systems use……

Quality Supervision and Testing Center for Explosion proof Electrical Equipment in the Mechanical Industry

The explosion-proof certification agency Jiamusi Explosion proof Motor Research Institute Co., Ltd., the National Quality Supervision and Inspection Center for Crane Metallurgy and Explosion proof Motors, and the Quality Supervision and Inspection Center for Mechanical Industry Explosion proof Electrical Equipment are ……