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2. CQM Certification Group Co., Ltd

3. NanyangExplosion proof electricalResearch Institute Limited (CNEX)

4. Shanghai Instrument and Control System Inspection and Testing Institute Co., Ltd. (NEPSI)

6. Zhongchuang Xinhai (Tianjin) Certification Services Co., Ltd. (PCEC)

There are also over a dozen laboratories (continuously updated):

Suzhou Electric Appliance Science Research Institute Co., Ltd

National Quality Supervision and Inspection Center for Low Voltage Explosion proof Electrical Appliances (Liaoning)

Low voltage in the mechanical industryExplosion proof electrical productsQuality Supervision and Testing Center

Shanghai Instrument and Control System Inspection and Testing Institute Co., Ltd

National Quality Supervision and Inspection Center for Explosion proof Electrical Products

National Quality Supervision and Inspection Center for Explosion proof Products (Tianjin)

National Coal Mine Explosion proof Safety Product Quality Supervision and Inspection Center

National Nonferrous Metallurgical Mechanical and Electrical Product Quality Supervision and Inspection Center

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

National Coal Mine Dust Prevention and Ventilation Safety Product Quality Supervision and Inspection Center

ShanghaiCoal ScienceTesting Technology Co., Ltd

National Coal Mine Support Equipment Quality Supervision and Inspection Center

National Safety Production Changzhou Mining Communication Monitoring Equipment Testing and Inspection Center