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.
What are the requirements for a company to apply for explosion-proof certification -- Shenzhen ZhongNuo Testing Technology Co., Ltd.
For businesses, applying for a domestic explosion-proof certificate does not impose any special requirements on the company (except for the explosion-proof 3C certification).
Primarily, it's about checking if the product meets the explosion-proof standards and if the required documentation can be provided.
If the product falls under the explosion-proof 3C certification category, the applicant must have a production factory (OEM/ODM is also acceptable).
Because the explosion-proof 3C certification is a certification model that combines type testing with factory inspection.
In addition to product testing, an annual factory audit is required.

Division of explosion-proof zones in explosive gas environments
In explosion-proof certification, hazardous areas are divided into explosive gas environments and combustible dust environments based on the different physical states of substances present in the location. Based on the duration of presence of hazardous substances in the location, these areas with different physical states are further divided into three zones.
That is: for explosive gas environments, Zones 0, 1, and 2.
Areas with continuous or long-term explosive gas environments, typically exceeding 1000 hours per year.
Zone 1 - Areas where explosive gas environments may occur during normal operation, typically 10-1000 occurrences/year.
Zone 2 - Under normal operation, explosive gas atmospheres are not likely to occur or, if they do, are only temporary and of short duration, generally less than 10 hours per year.

Domestic explosion-proof certification
Domestic explosion-proof certification is a compliance inspection for explosion-proof products used in explosive environments, including both electrical and non-electrical products.
Issue explosion-proof certificates for products that meet the GB/T3836 standard.
Current domestic explosion-proof certification standards are essentially equivalent to the international IEC 60079 standard system.

Explosion-proof Certification Categories -- Shenzhen ZhongNuo Testing Technology Co., Ltd.
Electrical equipment for explosive gas environments:
Explosion-proof type d
(2) Explosion-proof type e
(3) Intrinsically Safe i
(4) Positive Pressure Type P
(5) Immersion Type
(S6) Sand-filled type q
(7) Cast-in-place
(8) "N" type
2. Electrical Equipment for Combustible Dust Environments
Dust-Proof Ignition-Resistant Housing
(2) Positive Pressure Type
(3) Intrinsically Safe
(4) Cast-in-place
3. Intrinsically Safe Type S
4. Composite Type: A combination of two or more of the above explosion-proof types
Explosion-proof Certification Application Consultation Service - Shenzhen ZhongNuo Testing Technology Co., Ltd.