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.
Market Access System for Explosion-Proof Products
1. Explosion-proof Certificate System: Applies to all explosion-proof products, utilizing the "type testing" method.
2. CCC Certification: Applicable only to certain explosion-proof products (excluding metrological products and explosion-proof lighting), with a method of "Type Testing + Factory Inspection"
3. Coal Safety Mark (MA): Suitable for mining products, adopted the "Type Inspection + Factory Inspection" method

Certificate of explosion-proof validity and renewal issues
The validity of the domestic explosion-proof certification is 5 years from the date of issuance.
If the Certificate expires, you can choose to renew it or replace it.
When a company's explosion-proof certificate is about to expire, the company should provide an application letter for a certificate replacement within three months before or after the expiration date.
Please bring the following documents for a reapplication for a certificate replacement.
International explosion-proof certifications, such as ATEX and IECEx, are 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 to ensure the validity of the Certificate.

Domestic explosion-proof certification models 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 those for non-mining purposes (products not listed in the Explosion-proof 3C Catalogue).
Certification Model: Product Testing
Certification Certificate: Explosion-proof Compliance Certificate
Certificate Validity: 5 years
Annual Audit Required: No
2. Intrinsically Safe 3C Certification System
Applicable Products: Electrical Equipment listed in the Explosion-Proof 3C Catalog
Certification Mode: 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 Mine Safety/Mineral Mine Safety Certification System.
Applicable Products: Various electrical and non-electrical equipment for use in both coal and non-coal mines.
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 conducted.

Division of explosion-proof areas in flammable dust environments -- Shenzhen Zhongnuo Testing Technology Co., Ltd.
Explosive atmospheres are classified based on the physical state of substances present at the location, into environments with explosive gases and flammable dust. According to the duration of presence of hazardous substances at the location, the hazardous areas under the two different physical states are divided into three zones.
For environments with combustible dust, it is designated as 20, 21, and 22 zones.
Areas in Zone 20 with continuous or long-term presence of flammable dust, typically exceeding 1000 hours per year.
Zone 21 - Areas where combustible dust environments may occur during normal operation, typically 10-1000h/y
Zone 22 - Under normal operation, flammable dust environments are unlikely to occur, nor are they occasionally present for a short duration; typically, occurrences are below 10h/year.
Explosion-proof Certification Application Consultation Service - Shenzhen ZhongNuo Inspection & Testing Technology Co., Ltd.