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Explosion proof certification refers to the work of determining whether equipment meets the requirements of explosion-proof standards, conducting type tests and routine tests for adaptation, and issuing relevant certificates of conformity. The explosion-proof certificate can be applied to Ex equipment or Ex components.

 01 What is explosion-proof electrical equipment?

Electrical equipment intended for use in explosive hazardous areas such as petrochemicals, coal, pharmaceuticals, steel, and offshore platforms. According to national regulations, all products related to "personal health and property safety" should be subject to the constraints and control of mandatory national standards. Therefore, explosion-proof electrical equipment produced, sold, and used within the territory of China must comply with relevant inspection procedures and obtain explosion-proof certificates issued by nationally authorized explosion-proof inspection agencies. 

02 Classification of Explosive Environment Zones

Based on the frequency and duration of the occurrence of explosive hazardous substances, explosive gas hazardous areas are divided into three zones, as follows:

Zone 0: A place where explosive gas mixtures exist continuously or for a long time under normal circumstances (over 1000h/y).

Zone 1: Places where explosive gas mixtures may exist under normal circumstances.

Zone 2: A location where explosive gas mixtures are unlikely to occur under normal circumstances and only exist for a short period of time under abnormal conditions (less than 10h/y).

Correspondingly, the combustible dust area is divided into zones 20, 21, and 22.

03 What are the contents of the explosion-proof certificate?

The explosion-proof certificate mainly includes certificate number, manufacturer name, product name, model, explosion-proof mark, explosion-proof standard, inspection agency mark, issuance date, product usage precautions, and other contents.

04 What are the types of explosion-proof certification?

---Explosion proof type "d"

---Increased safety type "e"

---Intrinsic safety type "ia", "ib", "ic"

---Positive pressure type "px", "py"

---Sealing type "ma", "mb", "mc"

---Oil filled type "o"

---Filling sand mold "q"

---Non sparking type "nA", "nR", "nC", "nL"

05 How to understand explosion-proof signs?

Taking Ex d e Ⅱ C T6 Gb as an example

 06 How long is the validity period of the explosion-proof certificate?

The validity period of China's explosion-proof certificate is 5 years from the date of issuance. If production and sales continue after the expiration, the certificate needs to be renewed. International explosion-proof certification generally does not have an expiration date, but it adopts the certification mode of product certification factory system supervision and audit, and the ATEX system audit cycle is 12 months.

After the replacement of the national explosion-proof certificate, products that still meet the standard and have obtained the certificate can continue to be produced and sold before the certificate expires. But after the certificate expires, it needs to be re examined and recognized according to the new standards.

07 What are ATEx and IECEx certifications?

ATEx certification is a mandatory safety certification by the European Union for electrical and non electrical equipment used in explosive hazardous areas. At present, ATEx certificates are recognized by EU countries, while Japan and North American countries do not recognize ATEx certificates.

IECEx certification is a certification under the international IEC system, which is voluntary for equipment used in explosive hazardous areas. Member countries of the IEC system mutually recognize IECEx certificates.
Similarly, when applying for ATEx and IECEx certificates, it is necessary to confirm the specific explosion-proof type and explosion-proof level.

08 Does applying for explosion-proof certification require factory audit?

At present, the domestic explosion-proof certificate does not require factory inspection, only samples need to be provided, and the certificate is only responsible for the samples.

International explosion-proof certification is stricter than domestic ones. For example, applying for an IECEx certificate requires factory inspection regardless of the explosion-proof type or level; ATEx requires factory inspection for both Zone 0 and Zone 1, except for Zone 2 which does not require factory inspection.

09 Do I need to do explosion-proof design before applying for explosion-proof certification?

The answer is affirmative.

The application for explosion-proof certification of a product itself is to verify that the product complies with the national explosion-proof standard GB3836 and must have explosion-proof performance. It is necessary for enterprises to design products according to explosion-proof standards in the early stage of applying for explosion-proof certification. This not only improves the efficiency of obtaining explosion-proof certification, but also saves the cost of obtaining evidence.

10 How long does it take to apply for explosion-proof certification?

Due to the various types and levels of explosion-proof certification, different types and levels of explosion-proof require different testing items and require different testing times.

Generally speaking, intrinsically safe electrical equipment can be certified within 2 weeks, explosion-proof equipment can be certified within 45 days, and other explosion-proof equipment can be certified within 1-2 months. (The above mentioned cycle is based on the premise that the customer provides complete information and sample testing has no rectification)

11 How much does it cost to apply for explosion-proof certification?

The cost of applying for an explosion-proof certificate is directly related to the explosion-proof type. In addition, if you want to apply for EU ATEx or international IECEx certification, it also includes the cost of factory audit.

12 What documents are required to apply for explosion-proof certification?

The required documents include:

--Explosion proof Certification Application Form

--Customer Business License

--Product circuit diagram, assembly diagram, schematic diagram, PCB diagram, BOM table, etc

--Product manual and enterprise standards

--Sample

Explanation: The information is subject to specific product evaluations, and English materials are required for applying for EU ATEx and IECEx certifications.
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