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.
Domestic explosion-proof certification modes are divided into three cases -- Shenzhen ZhongNuo Testing Technology Co., Ltd.
1. explosion-proof certification system
Applicable Products: Electrical and non-electrical equipment used in areas with explosive gases and dust, excluding equipment listed in the explosion-proof 3C catalog.
Certification Model: Product Testing
Certification Certificate: Explosion-Proof Compliance Certificate
Certificate Validity: 5 years
Annual Audit Required: No
2. Explosion-proof 3C Certification System
Applicable Products: Electrical Equipment listed in the Explosion-Proof 3C Catalog
Certification Model: Combination of Type Testing and Factory Audit
Certification Certificate: CCC Certificate
Certificate Validity: 5 years
Annual Audit Required: Yes, an annual audit is required.
3. Coal Safety/Mine Safety Certification System
Applicable Products: Various electrical and non-electrical equipment for use in coal and non-coal mines underground
Certification Model: Combination of Type Testing and Factory Audit
Certification Certificate: Mine Product Safety Mark Certificate
Certificate Validity: 5 years
Annual Audit: Yes, an annual audit is required.

Does the explosion-proof certification include the explosion-proof 3C certification?
To put it this way, in China, explosion-proof certifications are divided into Explosion-proof 3C Certification and Explosion-proof Certificate of Conformity.
Starting October 1, 2009, certain explosion-proof electrical equipment was included in the CCC certification list, which is a mandatory product certification. Products on the list must obtain the explosion-proof 3C certification, while explosion-proof products not on the list must obtain an explosion-proof qualification certificate certification.
This falls under different certification models. For the explosion-proof 3C certification, it involves "Product Testing + Factory Audit." It's not just about product testing; an on-site inspection of the manufacturing factory is also required. Only after the product testing and factory audit are both passed can a CCC certificate be issued.
Certification for explosion-proof compliance requires product testing; upon passing the test, you can frequently issue explosion-proof compliance certificates.
Customers should first confirm the product type before deciding on the certification model during inquiries.
For more details, please contact Shenzhen ZhongNuo Testing Technology Co., Ltd. directly!

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 flameproof 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 Part 6: Equipment protected by liquid immersion type “o” for explosive environments
GB/T 3836.7-2017 Explosive Atmospheres Part 7: Equipment protected by sand filling 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 enclosures

How to differentiate between Class II and Class III explosion-proof certifications?
Explosion-proof electrical equipment is categorized into Class I, Class II, and Class III explosion-proof certifications, based on different application locations.
We are referring to the Class I explosion-proof certification, which is a certification for underground coal mine equipment, typically used in conjunction with the coal safety certificate for the equipment.
Ⅱndustrial Hazardous Location Certificate refers to the certification for explosion-proof equipment used in non-mining explosive gas environments, such as equipment used in petrochemical, gas, and oil storage facilities.
Type III explosion-proof certificate refers to the certification for explosion-proof equipment used in non-mining explosive dust environments, such as equipment used in painting, sanding, feed, food, and other facilities.
The distinction between Class I, Class II, and Class III explosion-proof certifications mainly lies in the different usage locations of the equipment.
The current domestic explosion-proof certification standards are primarily based on the GB/T3836 series. The original GB12476 (dust) and GB25286 (non-electrical) series standards have also been merged into GB/T3836.
Explosion Proof Certification Application Consulting Service - Shenzhen Zhongnuo Testing Technology Co., Ltd.