Which are the authoritative domestic explosion-proof certification agencies?

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When it comes to explosion-proof certification agencies, people think of Nanyang CNEX, Tianjin PECE, Shanghai NEPSI, etc.; they are indeed authoritative explosion-proof certification bodies in China. Next, we will list one of the more authoritative and well-known explosion-proof certification agencies in China: CQST. **Short name for the Explosion-Proof Certification Electrical Product Quality Supervision and Inspection Center: Nanyang Explosion-Proof Institute. Location: Nanyang City, Henan Province. Qualifications: It is one of the earliest agencies to be granted Class A status, and it is also capable of conducting inspections on Category I products. PCEC: Short for the Electrical Products Explosion Protection Quality Supervision and Inspection Center in the petroleum and chemical industry. Location: Tianjin. Qualifications: It is under the administrative jurisdiction of CNOOC, and it is also one of the first institutions in China to be authorized to conduct explosion protection tests for Category II and Category III products. NEPSI: Abbreviation for the Explosion Protection Safety Inspection Station for Instruments and Meters of ** grade. Location: Shanghai Instrument and Meter Institute. Qualifications: Established in 1960, it became an independently registered legal entity in 2003, and is highly renowned throughout China. CHEM: Short for the Quality Supervision and Inspection Center for Explosion-Proof Electrical Equipment in the machinery industry; also known as the Jiamusi Explosion-Proof Inspection Institute. Location: Jiamusi City, Heilongjiang Province. Qualifications: Approved for establishment by a document issued by the Ministry of Science and Technology in 2011; to date, it has helped many enterprises in the northern region obtain explosion-proof certification. CQCEx: **Explosion-Proof Equipment Quality Supervision and Inspection Center (Guangdong); abbreviated as Guangdong Special Inspection Institute. Location: Guangzhou City, Guangdong Province. Qualifications: It was authorized by the General Administration of Quality Supervision, Inspection and Quarantine in 2016, addressing the lack of such institutions in southern China; it has seen rapid development in recent years. EETI: **Short for Electrical Appliance Product Quality Supervision and Inspection Center. Location: Suzhou Electric Apparatus Research Institute, Suzhou City, Jiangsu Province. Note: The provincial and municipal quality supervision bureaus conduct irregular quality inspections on explosion-proof equipment available on the market, as well as on the companies that produce such equipment. The products that pass these inspections are sent to relevant explosion-proof testing institutions for further testing; if they fail these tests, it will more or less affect the company’s operations.