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 a one-stop explosion-proof technology consulting service.
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 a flameproof enclosure "d"
GB/T 3836.3-2021 Explosive Atmospheres, Part 3: Equipment protected by increased safety "e"
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 enclosure “p”
GB/T 3836.6-2017 Part 6: Equipment protected by liquid immersion "o" for explosive environments
GB/T 3836.7-2017 Explosive Atmospheres, Part 7: Equipment protected by filling with sand 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

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 places with explosive gases and dust, excluding those for mining (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. Explosion-proof 3C Certification System
Applicable Products: Electrical Equipment listed in the防爆3C Catalogue
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 both coal mines and non-coal mines underground
Certification Mode: 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.

Explosion-proof Certification Categories -- Shenzhen ZhongNuo Testing Technology Co., Ltd.
Electrical equipment for explosive gas environments:
Explosion-proof type d
Safety Increased Type e
Type 4 (Intrinsically Safe)
(4) Positive Pressure Type P
(5) Immersion Type
(S6) Sand-filled type q
(7) Cast-in-place
(8) "N" type
Electrical equipment for flammable dust environments
Dust-Extinguishing Enclosure
(2) Positive Pressure Type
(3) Intrinsically Safe
(4) Cast-in-place
3. Intrinsically Safe Type S
4. Composite:防爆型式 that combines two or more of the above-mentioned types.

Explosion-proof Certification Categories -- Shenzhen ZhongNuo Testing Technology Co., Ltd.
Blast-proof certification is the process of determining if equipment meets the requirements of blast-proof standards, type testing, and routine tests, and issuing relevant qualification certificates.
Certificates are available for Ex equipment or Ex components.
Different regions have varying certification standards and systems for explosion-proof electrical products.
Currently, explosion-proof certifications internationally can be categorized into domestic explosion-proof certification, ATEX certification, IECEx certification, and North American explosion-proof certification.
Explosion Proof Certification Application Consultation Services - Shenzhen ZhongNuo Inspection & Testing Technology Co., Ltd.