Shenzhen Zhongnuo Testing Technology Co., Ltd. is based in South China, specializing in explosion-proof certification and coal safety certification application consulting services, offering one-stop explosion-proof technology consulting services.
How to Apply for Explosion-Proof Certification:
1. Self-Application: The company applies to the certification body independently, prepares the relevant documents on its own, assists in the debugging of the prototype independently, and modifies the parts that are not in accordance with the specifications independently. The process is relatively longer, with higher overall costs, and it takes both time and effort.
2. Agent Application: Refers to the entire consultation and application process with Shenzhen ZhongNuo Testing Technology Co., Ltd., including material modifications, prototype debugging, and progress coordination, all handled by the consulting agency, ensuring a good progress guarantee. Fast certificate acquisition, controllable comprehensive costs, saves time and effort.

Sample Requirements for Explosion-Proof Certification Application:
The sample machines submitted by the company should match the approved drawings and be fully assembled; the number of inspection units should meet the requirements.
If special disassembly tools are required, they should be sent along as well.
For potting-type electrical equipment, send a set of products with intact potting and a set without potting.
Observing windows should include an additional 5 pieces of clear components, with a minimum of 3.
Translucent parts for lighting fixtures should be separately sent in at least 5 pieces, with an additional 8.
Rubber aging tests should provide 3 to 5 pieces of 35156 rubber blocks.
Two plastic sheets with a diameter of 150-60mm are required for the insulation resistance test of the plastic shell. If the size permits, the test can be directly conducted on the plastic shell.
Generally, 1-2 finished products are required.

What is positive pressure explosion-proof? What technical requirements are there for obtaining a positive pressure explosion-proof certification for a product?
Positive pressure explosion-proof refers to the introduction of clean air or inert gas into the equipment interior.
Ensure internal equipment pressure exceeds the external explosive environment pressure, to isolate explosive mixtures from entering the equipment, thereby achieving explosion-proof performance.
The explosion-proof certification applicable standards are GB/T 3836.1 and GB/T 3836.5.
Primarily, it assesses the equipment's ventilation time, pressure monitoring system, pressure range, blow-off, and alarm functions to meet explosion-proof performance requirements.
Positive pressure type includes three explosion-proof grades: pxb, pyb, and pzc.
Select the appropriate explosion-proof certification level based on product structure and explosion-proof zones.
ZhongNuo Inspection has been in the explosion-proof industry for many years, well-versed in the requirements of the GB/T 3836 series standards.
Extensive certification experience in the positive-pressure type explosion-proof field.
We offer a one-stop service for explosion-proof technical guidance and consulting, including initial positive pressure explosion-proof design and rectification, drawing evaluation, installation guidance, and certification acquisition.
Our successful cases include positive pressure ultrasonic vibration plates, positive pressure omni-directional antennas, and positive pressure film thickness gauges, etc.
If you have a need for this, feel free to message us anytime!

Products for explosion-proof certification:
The new implementation details 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
Explosion Proof Certification Application Consulting Service - Shenzhen Zhongnuo Testing Technology Co., Ltd.