Shenzhen ZhongNuo Testing 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 can be said to be a symbol of an explosion-proof device. Through the explosion-proof marking, one can understand the type of explosion-proof design adopted by the equipment.
Applicable to explosive areas and explosion-proof zones, etc. So, what is an explosion-proof sign? What does an explosion-proof sign mean? How to interpret the explosion-proof signs of explosion-proof equipment?
In response to these issues, ZN Testing provides a detailed explanation for you.
For example, explosion-proof marking Ex db ib IIC T4 Gb.
This is a composite explosion-proof marking.
Ex indicates explosion-proof, all 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 gases include and).
T4 is the temperature category, indicating that the equipment's high surface temperature 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 about explosion-proof certifications and markings, feel free to message us anytime!

How to inquire about the explosion-proof certificate
Buyers and selectors of explosion-proof electrical equipment always opt for manufacturers or distributors with valid explosion-proof certification.
So, as a consumer, how can users verify if the explosion-proof certificate is genuine and valid?
Currently, there are a dozen or so authorized certification bodies in China that issue explosion-proof certificates.
There is no unified platform for querying explosion-proof certificates issued by various safety authorities.
Explosion-proof certificates issued by various institutions can only be verified on their respective websites.
Of course, every issuing agency can verify the authenticity of certificates by phone.
If the query certificate is genuine, the main parameters and validity period will be displayed below.
Of course, it would be impossible to find it then.
It's worth noting that since each issuing authority manually uploads their certification documents,
There may be a lag, meaning that the newly acquired certificate may not yet be searchable on their website.
This requires direct consultation with the shipping agency.

What documents are required to apply for an explosion-proof certification?
1. Product Drawings and Documentation: When an enterprise applies for a hazardous location electrical equipment explosion-proof certification, they should provide assembly drawings, circuit diagrams, printed circuit board diagrams, silk-screened diagrams, component material lists, and label diagrams, etc. For non intrinsic safety electrical equipment explosion-proof certification applications, the technical documentation submitted for inspection should include drawings that reflect the sample's explosion-proof performance (including assembly and component drawings). If the assembly drawing clearly indicates the product's explosion-proof parameters and structure, only the assembly drawing needs to be submitted for inspection.
2. Technical Documents: Include corporate standards/technical requirements. The corporate standards/technical requirements for the products should be written in the specified format, and their content should not only include performance requirements of the product but also cover relevant aspects of explosion-proof: such as basic parameters, explosion-proof markings, operating environmental conditions, explosion-proof performance requirements, relevant tests for explosion-proof performance, and markings related to explosion-proof.
3. Additional Information: For products with adhesive bonding or casting, provide the model names, performance descriptions, and relevant process documents for the adhesives and casting agents. For plastic shell products, include the material of the plastic and corresponding performance documents. Products with batteries require the relevant specifications of the batteries.

North American Intrinsically Safe Certification
The North American explosion-proof certification system (hereinafter referred to as NEC system [NEC: National Electrical Code]) differs significantly from our country's explosion-proof certification system under the support of the national standards (hereinafter referred to as GB system) in aspects such as classification and grouping of explosive substances, division of hazardous areas, explosion-proof protection methods, installation, and wiring. Currently, North American explosion-proof certification is divided into two major systems: Division and Zone. The Division system adopts the explosion-proof markings of the United States, while the Zone system follows explosion-proof standards consistent with the IEC system.
Explosion-proof Certification Application Consulting Service - Shenzhen Zhongnuo Testing Technology Co., Ltd.