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 one-stop explosion-proof technology consulting services.
Explosion-proof certified product categories:
The new implementation regulations are divided into 17 product units:
Explosion-proof motors: Center height ≤ 160mm or rated power ≤ 15kW, Explosion-proof motors: 160mm < center height ≤ 280mm or 15kW < rated power ≤ 100kW, Explosion-proof motors: 280mm < center height ≤ 500mm or 100kW < rated power ≤ 500kW, Explosion-proof motors: Center height > 500mm or rated power > 500kW.
2. Explosion-proof electric pumps
3. Explosion-proof distribution equipment
4. Explosion-proof switches, control, and protection products
5. Explosion-proof starters
6. Explosion-proof Transformers
7. Explosion-proof electric actuators, solenoid valves
8. Explosion-proof connector assembly
9. Explosion-proof surveillance products
10. Explosion-proof Communication and Signal Equipment
11. Explosion-proof Air Conditioners, Ventilation Equipment
12. Explosion-proof electric heating products
13. Explosion-proof accessories, Ex components
14. Explosion-proof instruments and meters
15. Explosion-proof sensor
16. Safety Fencing
17. Explosion-proof instrument cabinets

What test items are included in the explosion-proof certificate, and what are the requirements?
Explosion-proof is one of the most commonly used explosion-proof types in the market for explosion-proof products, adhering to the standards GB/T 3836.1 and GB/T 3836.2.
Explosion-proof is primarily achieved through the protection offered by the explosion-proof housing.
The explosion-proof housing must have sufficient thickness and strength; even in the event of an explosion inside the equipment, the flame will be extinguished due to the width, gap, and roughness of the housing's joint surfaces, preventing ignition of the external hazardous environment.
On the other hand, even in the event of an explosion in a hazardous area outside, the explosion-proof housing maintains its anti-explosion properties.
Overall, the shell is both blast-proof and explosion-resistant, hence the equipment tends to be rather heavy.
ZhongNuo Inspection has been deeply involved in the explosion-proof field for many years, familiar with the requirements of the GB/T 3836 series standards.
Extensive experience in the design and modification guidance for explosion-proof products, offering services such as explosion-proof housing design, drafting, certification, and drawing preparation.
If you have a certification need in this area, remember to message us!

What is a hazardous area explosion-proof certification? What are the requirements for applying for a hazardous area explosion-proof certification?
The intrinsically safe equipment primarily ensures compliance with explosion-proof requirements by controlling the electrical parameters of the device circuit and limiting the total circuit energy.
Key measures include reducing voltage and current, and controlling parameters of energy storage components such as inductors and capacitors.
Product design references the standards GB/T3836.1 and GB/T3836.4.
Customers applying for the explosion-proof certification of anti-theft devices need to provide electrical schematics, block diagrams, PCB layouts, and tag number diagrams.
Product assembly drawings, manuals, corporate standards, and other documentation.
Recently obtained for our customers by Zhejiang China Nova Inspection & Testing Co., Ltd.: temperature vibration sensors, remote transmitters, monitoring devices, Bluetooth beacons,
The explosion-proof certificates for walkie-talkies and similar products are all for intrinsic safety explosion-proof types.
If you also have products that require explosion-proof certification, feel free to send us a private message!

What are common misconceptions about explosion-proof certification?
The explosion-proof grade is not the higher, the better.
The explosion-proof grade is related to the product structure, installation, and usage location. Choose the appropriate one. Of course, as long as the product structure meets the requirements, the higher the explosion-proof grade, the wider the applicable range.
2. Explosion-proof rating is not the same as protection rating.
The protection grade, commonly referred to as the IP rating, is different from the explosion-proof grade.
3. The combination of temperatures is not the higher, the better; instead, the lower, the safer it is.
Temperature combinations T6 (85°C), T5 (100°C), T4 (135°C), T3 (200°C), T2 (300°C), T1 (450°C) indicate the high surface temperatures achieved by the equipment under unfavorable conditions. In explosive hazardous areas, of course, the lower the high surface temperature of the equipment, the safer it is.
4. Gas explosion-proof certificates cannot be used in dust areas, and conversely, dust explosion-proof certificates cannot be used in gas areas.
5. A防爆 certification is sufficient for use underground in coal mines.
Wrong. Electrical equipment used in coal mine shafts requires coal safety certification, and the frequent organization is the Safety Standardization Center.
Explosion-proof certification is only applicable to locations where explosive gases and dust are used underground in non-coal mines. If the product is listed in the explosion-proof CCC catalog, it is required to undergo an explosion-proof 3C certification.
Explosion-proof Certification Application Consulting Services - Shenzhen Zhongnuo Testing Technology Co., Ltd.