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 models are categorized into three situations -- Shenzhen ZhongNuo Testing Technology Co., Ltd.
1.防爆Certification System
Applicable Products: Electrical and non-electrical equipment used in places with explosive gases and dust, excluding those for mining purposes (except for products 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. 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
Whether Annual Audit: Audited Annually
3. Coal Safety/Mine Safety Certification System
Applicable Products: Various electrical and non-electrical equipment for use in both coal mines and non-coal mine shafts
Certification Model: Combination of Type Testing and Factory Audit
Certification Certificate: Mine Product Safety Mark Certificate
Certificate Validity: 5 years
Annual Audit Required: Yes, an annual audit is required.

Blast-proof certification is the process of verifying that equipment meets the requirements of blast-proof standards, type testing, and routine tests, and issuing relevant certificates of compliance.
Certificates are available for Ex equipment or Ex components. The explosion-proof standard GB/T3836 specifies:
Electrical equipment trial-manufactured in accordance with the explosion-proof type standards listed in GB/T3836.
All must be tested for explosion-proof requirements by authorized institutions in the country, in accordance with the relevant standards, and obtain an explosion-proof certification.
This means that explosion-proof products must obtain the relevant explosion-proof certification.

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 supported by the standard system (hereinafter referred to as GB system) in aspects such as classification and grouping of explosive materials, division of hazardous areas, explosion-proof protection methods, and installation wiring. Currently, North American explosion-proof certification is divided into two major systems: Division and Zone. The Division system uses the explosion-proof marking of the United States, while the Zone system adopts explosion-proof standards consistent with the IEC system.

Explosion-proof Certification Categories -- Shenzhen ZhongNuo Testing Technology Co., Ltd.
Electrical equipment for explosive gas environments:
Explosion-proof type d
Type 4X e
(3) Intrinsically Safe i
(4) Positive Pressure Type P
(5) Immersed type
(S6) Sand-filled type q
(7) Cast-in-place
(N) Type
2. Electrical equipment for combustible dust environments
Dust-Extinguishing Enclosure
(2) Positive Pressure Type
(3) Intrinsically Safe
(4) Cast-in-place
3. Explosion-proof type S
4. Compound Type:防爆型式 that combines two or more of the aforementioned types.
Explosion-proof Certification Application Consulting Services - Shenzhen Zhongnuo Testing Technology Co., Ltd.