Shenzhen Zhongnuo Inspection & Technology Co., Ltd. is based in South China and specializes in explosion-proof certification and coal safety certification application consulting services, offering one-stop explosion-proof technology consulting services.
What does the explosion-proof marking Ex db ib IIC T4 Gb mean?
The explosion-proof marking indicates the type of explosion-proof design of a piece of equipment.
Applicable to explosive areas and explosion-proof zones, etc.
What is an explosion-proof marking? What does an explosion-proof marking signify? How do you interpret the explosion-proof marking on explosion-proof equipment?
In response to these issues, ZN Testing provides a detailed explanation for your reference.
For example, explosion-proof marking Ex db ib IIC T4 Gb.
This is a composite explosion-proof marking.
Ex indicates explosion-proof; explosion-proof equipment must be marked with the Ex symbol.
DB IB refers to the explosion-proof protection type of the equipment, meaning it is both explosion-proof and intrinsically safe.
IIC refers to equipment suitable for explosive gas atmospheres of IIC category gases (representative gas is and).
T4 is the temperature category, indicating that the surface temperature of the equipment does not exceed 135°C.
Gb refers to the equipment protection level, applicable to Zones 1 and 2.
The example above illustrates a common explosion-proof marking used for equipment in an explosive gas environment.
If used underground in coal mines or in environments with combustible dust, the explosion-proof markings on the equipment are different.
If it's an ATEX explosion-proof certification mark, it gets more complex.
If corporate clients need more information on explosion-proof certifications and markings, feel free to private message us anytime!

Ex-proof certificates and Ex-proof 3C certifications are two different certification requirements for explosion-proof products. The main differences between them are reflected in the following aspects:
I. Applicable Product Range:
Ex-proof Certificate: Applicable to all ex-proof electrical products and non-electrical products, regardless of whether they are included in the Ex-proof 3C Certification Catalogue.
Explosion-proof 3C Certification: Specifically refers to products listed in the explosion-proof 3C Certification Catalog, such as motors, fans, walkie-talkies, etc. These products, if previously issued with an explosion-proof certificate, must be converted to the explosion-proof 3C Certification.
II. Certification Methods:
Explosion-proof Certificate: Issued after product testing to confirm compliance with relevant standards for explosion-proof performance.
Explosion-proof 3C Certification: Adopting the "Product Testing + Factory Audit" approach, it not only requires the product itself to meet explosion-proof standards but also demands that the applicant's manufacturing facility or OEM/ODM factory complies with certain quality management systems and production conditions, necessitating annual supervision audits.
III. Certification Bodies and Standards:
Explosion-proof certificate: Issued by a third-party testing institution with the appropriate qualifications, based on relevant explosion-proof product standards.
Explosion-proof 3C Certification: Managed by the China Certification and Accreditation Administration (CNCA), which designates qualified certification bodies to issue the certification. The designated testing laboratories conduct the relevant tests. The certification is based on the mandatory product certification standards (i.e., the 3C standards) and related explosion-proof product standards.
Four: Market Access Requirements:
Ex-proof Certificate: It is one of the basic requirements for ex-proof products to enter the market, but not all ex-proof products require 3C certification.
Explosion-proof 3C Certification: Obtaining an explosion-proof 3C certification is a mandatory requirement for products listed in the explosion-proof 3C certification catalog to enter the market.
In summary, there are significant differences in the scope of application, certification methods, certifying bodies and standards, as well as market access requirements between explosion-proof certificates and explosion-proof 3C certifications. Therefore, when deciding which certification to pursue, it's essential to consider the specific product details and market access requirements. Should you have any questions or need further information, please feel free to contact Shenzhen ZhongNuo Testing Technology Co., Ltd. at any time.

What should be noted when applying for a domestic explosion-proof certificate for products?
What should be noted when applying for a domestic explosion-proof certification? Zhongnuo Testing, with years of experience in the explosion-proof certification industry, mainly shares the following points:
(1) Is the product design in compliance with the relevant GB/T3836 standards? For example, explosion-proof designs should refer to GB/T 3836.1 and GB/T 3836.2, intrinsically safe designs should refer to GB/T 3836.1 and GB/T 3836.4, etc.
(2) Can certification documents be provided, such as schematics, assembly drawings, structural drawings, BOM sheets, manuals, corporate standards, etc.? Some products may also require battery Testing Reports, wireless transmission power Reports, potting process, and shell material Reports.
(3) Are there specific requirements for certification bodies and explosion-proof ratings? Sometimes, the demand for explosion-proof certification is initiated by the end customer. In such cases, it is important to understand the type of explosion-proof environment and area where the end customer's product is used, as well as any specific requirements for the product's IP rating, corrosion resistance, and certifying body.
(4) Is the company to collect evidence itself or through an agent? If the company is not familiar with explosion-proof design standards, drawing preparation, etc., and is new to obtaining explosion-proof certification, it is recommended to choose ZN Testing Application for time, effort, and worry savings.
(5) Next comes the budget for costs. If you choose to apply with Zhongnuo Inspection, a service fee for technical services will be incurred. Zhongnuo Inspection will save your company on human and material resources, shorten the application process, and contribute to our friends in the enterprise community by helping to bring new explosion-proof products to market.
If you have a need for explosion-proof certification in this area, feel free to DM us anytime!

How to differentiate between gas explosion-proof certification and dust explosion-proof certification?
The gas explosion-proof certification and dust explosion-proof certification we commonly refer to are categorized based on the applicable locations of the equipment.
Explosion-proof equipment for various hazardous gas environments is subject to gas explosion-proof certification, while equipment for places with combustible dust is subject to dust explosion-proof certification.
In explosion-proof certification, gases are categorized as IIA, IIB, and IIC, while dusts are classified as IIIA, IIIB, and IIIC. Their characteristics and environments differ, necessitating different explosion-proof protection measures for equipment. These two types are not interchangeable. Of course, certain products, when undergoing explosion-proof certification, are designed to meet both gas and dust explosion-proof standards, allowing them to be used in both gas and dust environments. The explosion-proof certificate also indicates whether it is for gas or dust explosion-proof certification through the explosion-proof symbol.
Learn more about explosion-proof information; feel free to contact us at any time!
Shenzhen Zhongnuo Testing Technology Co., Ltd. has long been dedicated to the explosion-proof field, boasting extensive evidence collection experience and a skilled technical team in the current explosion-proof certification domain. We have experienced intrinsic safety electronic engineers who can provide intrinsic safety design, cloning, circuit evaluation, and rectification services, helping companies avoid pitfalls and facilitating their explosion-proof certification process.
Explosion-proof Certification Application Consulting Service - Shenzhen Zhongnuo Testing Technology Co., Ltd.