Explosion-proof certification
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This post was last edited by Name of Forgetfulness on 2020-12-13 at 15:39. Question: The explosion-proof certification for the explosion-proof junction box installed on-site in our company is as follows: Product name: Explosion-proof (corrosion-resistant) junction box; Type specification: BJX AC380V/220V 225A; Explosion-proof marking: Ex-d II C T6 Gb/Ex tD A21 IP65 T80℃; Product standards: Q/JX006-2018; Drawing number: BJX-000; Note: 1. This product is suitable for use under the conditions specified by the explosion-proof marking ExdIIBT6Gb. 2. It can represent the device under operating conditions with a rated current of up to 225A. 3. The cable entry device equipped with a packing seal shall meet the explosion-proof requirements after installation. Date of issue: 2018-05-07. Valid date: 2023-05-06. Question: 1. The product meets the explosion-proof requirements, but the explosion-proof mark indicates dual certification. However, the remarks section indicates the operating conditions for the applicable explosion-proof mark ExdIIBT6Gb. Could you please advise on how to understand this? 2. The explosion protection mark field on the product nameplate only shows Ex d IIIC T6 Gb. Is this appropriate? Do I need to replace it with a label that requires dual certification, or is it sufficient to provide a dual certification report when an expert conducts an on-site inspection? Thank you!
A and B are also contradictory, right?
This post was last edited by qugd on 2020-12-14 at 13:15. A proper explosion-proof certificate should contain the following important information: 1. The explosion-proof design and classification level (there are two values listed on this certificate; it is necessary to determine which one to use). 2. The code of the explosion-proof certificate, which is the unique identifier that can be used to verify the certificate with the issuing authority. 3. The institution that issued the certificate; in China, this is usually the Nanyang Explosion Protection Institute or the Shanghai ** Explosion Protection Institute. 4. The name of the company to which the certificate was issued and the name of the equipment. The two different explosion-proof markings on your certificate seem contradictory – isn’t that a problem? Pressing it down should not be a problem, but if it’s used in that high environment, how can this contradiction be explained to the users?
Thank you for your reply. Please add the following information: 1. This explosion-proof certificate was issued by the Low-Voltage Explosion-Proof Testing Center of the Machinery Industry; 2. The name of the enterprise to which the certificate is awarded and the name of the equipment are listed on the certificate, but I did not copy them. 3. The number of the explosion-proof certificate is SYEx18.0319X. In response to my initial question, both the explosion-proof design and the explosion-proof rating are indicated; the two markings are Ex d IIIC T6 Gb/Ex tD A21 IP65 T80℃, and I acknowledge its dual certification. It seems that the note stating “This product is suitable for use under the conditions specified by the explosion-proof marking ExdIIBT6Gb” is also acceptable. Because ⅡC＞ⅡB. The remaining issue is that the nameplate on the field equipment only indicates Ex d IIIC T6 Gb. I’m not sure if it meets the standard requirements.
Marking only Ex d ⅡC T6 Gb is fine, right?
First question: looking at this explosion-proof certification you sent, the first point mentioned in the notes seems redundant. Under the same conditions, IEC Class II C applies to both IEC Class II B and IEC Class II A, so no special note is necessary. You can also send us the explosion-proof certification for verification. The second question: although this explosion-proof certification uses dual standards, if the product is used in other types of environments, only the relevant explosion-proof mark for those environments needs to be indicated. Similarly, if it is used in a dusty environment, a dust explosion-proof mark should be used; whereas if it is used in both gas and dusty environments, both explosion-proof marks need to be displayed on the nameplate.
This post was last edited by Zhongnuo Service Window 08 on 2023-10-10 at 13:38. There is no conflict; the explosion-proof rating is d IIC T6, which means it can be used in d IIB T6 environments. The note is a bit redundant, but given the various strange requirements from applicants, it’s understandable. We have also encountered situations where the tests met the Gb requirements, but the client insisted on specifying Gc. Logically, it makes sense, but it’s hard to understand
Sometimes, the notes are requested by the client; as long as they meet the requirements, the explosion-proof department will agree to include them.