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's the difference between CE certification and coal mine safety certification for products?
intrinsic safety certification, also known as intrinsic safety explosion-proof certification.
In the explosion-proof industry, there are various explosion-proof protection types such as flame arrester, intrinsically safe, increased safety, positive pressure, and sealed-in, etc.
intrinsic safety is just one type of explosion-proof design; equipment adopting this type of explosion-proof design is used in explosive areas.
Due to limitations on its working voltage, current, capacitance, inductance, etc.
Even if sparks occur within the circuit, they are not sufficient to ignite the surrounding explosive environment, making it inherently safe.
Intrinsically safe certification is widely used for 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.
Electrical equipment used underground in coal mines must be equipped with protective measures to achieve explosion-proof performance due to the presence of explosive substances like methane.
You can choose suitable explosion-proof protection types such as intrinsic safety, flameproof, and encapsulation based on product structure, electrical parameters, installation methods, and usage areas.
It's worth noting that electrical equipment applying for the Coal Safety Certification must not only possess explosion-proof capabilities but also meet performance tests for the special underground environment of coal mines.
ZhongNuo Inspection has long been dedicated to explosion-proof certification and coal safety certification, well-versed in certification standards.
Proficient in the explosion-proof design, modification, testing, certification, and factory audit processes and requirements for the product, capable of facilitating rapid acquisition of explosion-proof and coal safety certifications for enterprises.

Why choose tempered glass for explosion-proof transparent parts?
Transparent components are a crucial material for explosion-proof electrical equipment. When selecting transparent components, customers always ask what material should be used? Can glass be used? Can plastic be used?
Below, Shenzhen Zhongnuo Testing Technology Co., Ltd. explains to you.
GB/T3836.1 explicitly stipulates the thermal shock test for transparent parts, which aims to verify the thermal stability of glass under rapid cooling conditions. Currently, tempered glass is a material that not only meets this requirement but also offers high cost-performance.
To普及, tempered glass forms an even compressive stress layer on its surface due to quenching after heating, which offsets the tensile stress generated during rapid cooling. Therefore, even when subjected to rapid cooling, qualified tempered glass will have the compressive stress to counteract the effects of the stress.

How to Apply for Explosion-Proof Certification for Enterprises:
1. Self-Application: The company applies directly to the certification body, prepares the necessary documents independently, assists in debugging the sample machine, and modifies any parts of the documentation that are non-standard. This process takes a relatively longer cycle, involves higher comprehensive costs, and is time-consuming and labor-intensive.
2. Agent Application: It refers to the entire process of consulting and applying to Shenzhen ZhongNuo Testing Technology Co., Ltd., including material modifications, prototype debugging, and progress coordination, which are entrusted to the consulting agency. Progress is well-ensured. Fast certification, controllable overall costs, time and effort-saving.

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 an "e" type of increased safety
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 enclosures "p"
GB/T 3836.6-2017 Explosion-proof Environment, Part 6: Equipment protected by liquid immersion "o"
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 encasement type "m"
Explosion-proof Certification Application Consulting Services - Shenzhen ZhongNuo Testing Technology Co., Ltd.