Explosion-proof certificate and explosion-proof compliance certificate application document list

Shenzhen ZhongNuo Testing Technology Co., Ltd. is based in South China and specializes in explosion-proof and coal safety certification application consulting services, offering a one-stop consulting service for explosion-proof technology.
Certification standards for explosion-proof equipment used in environments with explosive gas:
GB/T 3836.1-2021 Explosive Atmospheres, Part 1: Equipment, General Requirements
GB/T 3836.2-2021 Explosive Atmospheres, Part 2: Equipment protected by explosion-proof enclosures "d"
GB/T 3836.3-2021 Explosive Atmospheres, Part 3: Equipment protected by intrinsic safety "i"
GB/T 3836.4-2021 Explosive Atmospheres, Part 4: Equipment protected by intrinsic safety "i"
GB/T 3836.5-2021 Explosive Atmospheres, Part 5: Equipment protected by positive pressure enclosures "p"
GB/T 3836.6-2017 Explosion-proof environment — Part 6: Equipment protected by liquid immersion “o” type
GB/T 3836.7-2017 Explosive Atmospheres, Part 7: Equipment protected by sand-filled type “q”
GB/T 3836.8-2021 Explosive Atmospheres, Part 8: Equipment protected by "n" type protection
GB/T 3836.9-2021 Explosive Atmospheres, Part 9: Equipment protected by "m" type encapsulation

Limitation requirements for surface resistance of non-metallic外壳of explosion-proof equipment
In hazardous areas with explosive dust or gases, such as coal dust and flour, static electricity can cause fires or explosions, posing a significant risk. Therefore, it is advisable to minimize the use of insulating materials in explosive hazard areas. When selecting electrical insulating materials, consider maintaining low insulation resistance to prevent discharge when non-metallic components come into contact with charged parts. For non-metallic insulating materials, the antistatic capability of the equipment can be assessed by measuring the surface resistance of the equipment's housing.
Surface resistance, measured in ohms (Ω), refers to the resistance between two electrical contacts on the measuring surface.
In compliance with the IEC 60079 series standards:
1. In Class II explosive gas environments, when the surface area of a non-metallic enclosure of an electrical equipment exceeds a certain limit (as shown in Table 1), a surface resistance test must be conducted on the non-metallic material to ensure that: by selecting the material, the surface resistance meets at least one of the following requirements when measured according to IEC 60079-0 26.13:
At ≤1 GΩ, (505)% relative humidity;
At ≤ 100 GΩ, (305)% relative humidity.
2. In environments with Category III explosive dust, if the surface area of the non-metallic housing of electrical equipment does not exceed 500 mm², the risk of static electricity can be disregarded. If it exceeds this limit, surface resistance testing is required for verification. The criteria for assessment are the same as those for the surface resistance testing limits in Category II gas environments. For fixed-installed equipment that cannot meet the surface resistance limits, an "X" can be added after the " explosion-proof " mark, a corresponding warning sign should be placed on the equipment, and users should be informed in the user manual.

Intrinsically safe certification and explosion-proof certification have clear distinctions within the explosion-proof field, while intrinsically safe certification is also a specific form of explosion-proof certification.
Intrinsically Safe Certification: This certification indicates that the equipment is equipped with an intrinsic safety type of explosion-proof protection. Intrinsic safety explosion-proofing primarily achieves this through limiting the equipment's energy, such as by restricting working voltage, current, capacitance, inductance, etc., to ensure that even if sparks are generated internally, they are not sufficient to ignite the surrounding explosive environment. Therefore, this certification is particularly suitable for low-power products and handheld devices.
‌Explosion Proof Certification: This is a broader category that encompasses various explosion-proof protection types, such as flameproof, intrinsic safety, pressurized, and encapsulated. These types are designed to ensure that equipment operates safely in explosive environments, preventing explosions or triggering larger ones.
In short, ATEX certification is a type of explosion-proof certification, focusing on intrinsic safety explosion-proof designs, while explosion-proof certification covers a wider range of explosion-proof designs.
If you need more information about ATEX certification or explosion-proof certification, or if you need to apply for such certifications, Shenzhen Zhongnuo Testing Technology Co., Ltd. can provide the services and support you require.

Expiration Date and Renewal of Explosion-Proof Certificate
The domestic explosion-proof certification is valid for 5 years from the date of issuance.
If the certificate is due to expire, you can choose to renew it or replace it. When a company's explosion-proof qualification certificate is about to expire,
The company shall provide an application letter for certificate renewal within three months before and after the validity period, and should bring relevant documents for the renewal application.
Overseas explosion-proof certification, such as ATEX and IECEx certificates, is valid for a specific period.
Because their method of evidence collection is by means of type testing.
A combination of product certification and factory production quality system audit.
Ensure the validity of the certificate.
Explosion-proof Certification Application Consulting Service - Shenzhen ZhongNuo Testing Technology Co., Ltd.