Shenzhen ZhongNuo Testing Technology Co., Ltd. specializes in consulting services for explosion-proof certification and coal mine safety certification.
What standards are used for explosion-proof certification? What are the technical requirements?
An explosion-proof type is a type of electrical equipment's explosion-proof design, where the housing can withstand the explosion of an explosive mixture entering the housing through the housing joint surfaces or structural gaps without damage, and prevent the ignition of an explosive gas environment formed by one or more gases or vapors outside.
Explosion-proof casings must possess both anti-explosion and explosion-proof capabilities. Generally, the casings for explosion-proof products are rather bulky, suitable for products and equipment designed for fixed installations and use.
Combustible gas-tight joint width, gap, and roughness are the three key elements of explosion-proof housing design.
Design requirements for explosion-proof elements vary depending on the different explosive gas environments of mining Class I, non-mining Classes IIA, IIB, and IIC. Specific standards can be referred to in GB/T3836.1 and GB/T3836.2.
Zhonuo Inspection has long specialized in explosion-proof product design, testing, and certification services. We have a dedicated team in the explosion-proof field, well-versed in the requirements of explosion-proof standards. We offer services including explosion-proof housing design, drafting, modification guidance, and certification agency assistance.
If you have a similar need, feel free to private message Shenzhen ZhongNuo Inspection & Technology Co., Ltd. anytime!

Do I need a factory audit to apply for the Coal Safety/Miner Safety Mark?
Required. Unlike the application for a explosion-proof certification, strict control is applied to the mining marking management.
To apply for the Coal Safety and Mine Safety Certification, a factory audit of the applicant company is required.
Manufacturing facilities can be production-oriented companies, assembly-oriented companies, or OEM enterprises.

What types of companies are eligible to apply for the Coal Safety/Mineral Safety Mark? -- Shenzhen ZhongNuo Testing Technology Co., Ltd.
Application Requirements for Coal Safety Certification
Company Qualifications: Anbang Standard Center currently issues certifications only to companies engaged in production/manufacturing/processing or OEM models.
We have a fixed production facility; the company has the capability to produce and test products; we have a certain number of technical personnel; and we have a management system in place to ensure product quality and safety requirements.
(1) Manufacturing and assembly companies, with fixed production facilities and equipment, as well as testing equipment.
(2) The product applied for should fall within the scope of the company's business operations.
(3) We have a comprehensive and effective quality assurance system.
(4) Possesses relevant technical strength;
(5) Other Relevant Conditions

Sample preparation for Coal Mine Safety and Mine Safety Certification -- Shenzhen ZhongNuo Testing Technology Co., Ltd.
The prototype manufacturing is completed according to the design drawings. The project team establishes the inspection outline based on the company and industry standards, and the Quality Assurance Department completes the factory inspection according to the inspection outline. Note: In addition to preparing the prototype, electrical products also require the preparation of electrical components for safety tests, such as intrinsically safe power supplies, sensors, etc.; and for electrical performance tests, components such as contactors, circuit breakers, and disconnectors, etc.
Coal Safety Certification and Mine Safety Certification Consultancy Services - Shenzhen Zhongnuo Testing Technology Co., Ltd.