Shenzhen Zhongnuo Testing Technology Co., Ltd. specializes in consulting services for explosion-proof certification and coal 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 that can withstand the explosion of an explosive mixture entering the housing through the junction surfaces or structural gaps without damaging the housing, and prevent the ignition of an explosive gas environment formed by one or more gases or vapors outside.
Explosion-proof casings must possess both explosion-proof and anti-explosion capabilities. Generally, the casings of explosion-proof products are rather bulky, suitable for products and equipment designed for fixed installations and use.
Explosion-proof face width, gap, and roughness are the three key elements of explosion-proof housing design.
Design requirements for explosion-proof three elements vary depending on the different explosive gas environments in mining Class I, non-mining Class IIA, IIB, and IIC. For specific standards, refer to GB/T3836.1 and GB/T3836.2.
Zhenuo Inspection has long been dedicated to explosion-proof product design, testing, and certification services. We have a specialized 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 need for this as well, feel free to send a private message to Shenzhen ZhongNuo Testing Technology Co., Ltd. anytime!

Does the Coal Safety/Mineral Safety Mark require an annual inspection?
The Mark Management Authority conducts supervisory inspections on enterprises holding the Coal Safety/Mineral Safety Mark annually.
Generally, prior notice is given to the company for preparation before the annual supervision and review, with relatively strict requirements.

The domestic coal safety certification system is still quite strict. It combines type testing with factory production system review.
To ensure that the applicant company is capable of ensuring the production and capability of the products. Even after obtaining the coal safety certification,
The company must also undergo annual supervision and evaluation by the ANSI Center.

What is the difference between applying for the intrinsically safe certification and the coal mine safety certification?
intrinsic safety certification, also known as intrinsic safety explosion-proof certification.
In the explosion-proof industry, there are various types of explosion-proof protection, including隔爆型、本质安全型、增安型、正压型、浇封型, and so on.
intrinsic safety is just one type of explosion-proof design; equipment utilizing this type of explosion-proof design is used in explosive areas.
Due to the limitations on its working voltage, current, capacitance, inductance, etc., even if sparks are produced inside the circuit, they are not sufficient to ignite the surrounding explosive environment, making it inherently safe.
The Intrinsically Safe certification is widely applied to low-power, energy-efficient instruments, handheld terminal products, and more.
Coal Mine Safety Certification is a mandatory safety certification for equipment used underground in coal mines.
Due to the presence of explosive substances like methane in coal mine shafts, electrical equipment used underground must be equipped with protective measures to ensure explosion-proof performance.
You can select appropriate explosion-proof protection types such as intrinsic safety, flameproof, and encased, based on product structure, electrical parameters, installation method, and usage area.
It's worth noting that electrical equipment applying for the Coal Mine Safety Certification must not only have explosion-proof capabilities but also meet performance tests for the special environment underground in coal mines.
ZhongNuo Inspection has long been dedicated to explosion-proof certification and coal safety certification application consulting, well-versed in certification standards and the explosion-proof design, rectification, testing, certification, and factory audit processes and requirements for products. We can help companies quickly apply for explosion-proof and coal safety certifications.
Coal Safety Certification and Mine Safety Certification Consulting Services - Shenzhen Zhongnuo Testing Technology Co., Ltd.