Can FM-certified explosion-proof instruments be used in an explosion protection class of ExdⅡCT6?
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1. A new batch of transmitters has only FM certification; the instrument data sheet indicates an explosion protection rating of ExdⅡCT6. Can they be used in an environment with an explosion protection rating of ExdⅡCT6? 2. A new batch of transmitters has only FM certification; upon arrival of these transmitters, the explosion-proof certification for subsequent models of transmitters will be provided, rather than the certification specific to that particular model. Is this feasible? 3. Has FM certification established a cooperative relationship with the **Explosion-Proof Electrical Products Quality Supervision and Inspection Center for mutual recognition of inspection results? Can they be recognized mutually? 4. The transmitter is FM-certified; subsequent series of transmitters will come with explosion-proof certification documents, but these are not the certification documents specific to a particular model. Can this meet the requirements of GB50093: that explosion-proof equipment must have a nameplate and explosion-proof markings, and that the number of the explosion-proof certification issued by an authorized institution should be indicated on the nameplate? Please help give some advice; I’m waiting online... Thank you all!
Is there any documentation for mutual recognition? In this case, GB50093 requires that explosion-proof equipment must have nameplates and explosion-proof markings, and the number of the explosion-proof certification issued by an authorized agency shall be indicated on the nameplate. How to understand it?
On our end, according to the unified regulations of the design institute, apart from products compliant with GB3836, ATEX, PTB/CENELEC BASEEFA/CENELEC FM, etc. are recognized as equivalent
The design documents I provide only comply with Chinese standards; when purchasing, authoritative explosion-proof certifications from China’s three major institutions are required – anything else will not be accepted, with special cases being an exception.
This should require two-factor authentication; first, it is necessary to obtain authoritative explosion-proof certifications from three major institutions, with the instruments being certified in Shanghai.
If an instrument doesn’t have a nameplate, I would doubt the authenticity of the manufacturer. At least the watches I’ve seen all have engraved labels. Wait for professional answers downstairs!
1. Regarding model issues, the principles of type approval should be followed. In other words, the FM certification must include explicit descriptions of any other variant models or configurations that might be involved, along with written statements confirming that these models and configurations meet the requirements. This generally refers to Class/Division/Group and the Ta range. Since different technical standards are followed (NEC/American standards), rather than European standards such as CENELEC or ATEX (EEx d IICT6), the manufacturer should at least provide an official statement; it’s not acceptable for the designer to have to look things up on their own ； 2. As far as I know, among the more authoritative certification bodies in China (the three explosion-proof certification agencies recognized by IEC), only the **Explosion-Proof Electrical Product Quality Supervision and Inspection Center (CQST)** you mentioned has mutual recognition with FM; the other two, namely the **Nequipment Explosion Protection Safety Supervision and Inspection Station (NEPSI)** and the China Petroleum and Chemical Industry Electrical Product Explosion-Proof Quality Supervision and Inspection Center (PCEC), do not possess this capability. 3. In China, of course, it is necessary to comply with Chinese regulations; the manufacturer should provide an internationally recognized explosion-proof certification, which should be indicated on the nameplate. Don’t worry, obtaining such recognition is quite simple.
Does FM certification refer to the explosion-proof certification by an FM agency? If so, FM certification is an explosion-proof certification from the United States, and it differs from the classification of explosion-proof marks used in China. In other words, the explosion-proof mark on an FM-certified product cannot be ExdⅡCT6, and U.S. explosion-proof certifications cannot be used directly in China; explosion-proof equipment used there must have domestic explosion-proof certifications.
Strictly speaking, domestic standards are the only ones recognized in China. Since China is also a member of the IECEx system, devices with IECEx certificates are also accepted directly. Some domestic explosion-proof certification bodies also recognize devices with ATEX certification, as well as those with explosion-proof certifications from North America. These are merely different requirements imposed by various agencies; they do not represent unified requirements across China.