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 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 introducing clean air or inert gas into the equipment interior.
Ensure internal equipment pressure exceeds external explosive environment pressure to isolate explosive mixtures from entering the equipment, thereby achieving explosion-proof performance.
The applicable standards for explosion-proof certification under positive pressure are GB/T 3836.1 and GB/T 3836.5.
Primarily, it evaluates 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.
ZheNuo Inspection has been in the explosion-proof industry for many years, well-versed in the requirements of the GB/T 3836 series standards.
We have extensive experience in obtaining certifications for explosion-proof pressure systems.
Offer a one-stop technical guidance and consulting service for explosion-proof design and rectification in the early stage, drawing evaluation, installation guidance, certification, etc.
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!

IECEx Certification
IECEx is an explosion-proof electrical products certification system promoted by the International Electrotechnical Commission (IEC), aimed at eliminating differences in equipment and services used in explosive environments, promoting international trade, while maintaining the level of equipment safety requirements. The current explosion-proof standard is IEC 60079. IECEx certification has become a means for products used in all hazardous areas to obtain international safety certification, and is currently recognized in many parts of the world (including Australia, New Zealand, Brazil, Canada, China, Japan, South Korea, Malaysia, Singapore, South Africa, the United States, etc.). Certificates issued by IECEx are automatically uploaded to the IECEx website, where manufacturers and end-users can find the relevant documents.

North American Explosion Proof Certification
The North American explosion-proof certification system (hereinafter referred to as NEC system, with NEC standing for National Electrical Code) differs significantly from China's explosion-proof certification system (hereinafter referred to as GB system) under the support of the national standards. The North American explosion-proof certification is divided into two major systems: Division and Zone. The Division system uses the explosion-proof marking of the United States, while the Zone system adheres to the explosion-proof standards consistent with the IEC system.

How to apply for an explosion-proof certification for a modular equipment?
Now, there are more and more modular equipment used in explosion-proof areas, achieving more complex functions. In response to the technical requirements for explosion-proof certification of such equipment, ZHONGNUO Inspection has summarized years of industry experience, mainly including the following points:
(1) Explosion-proof performance is only considered for the electrical components, including their installation, connections, grounding, etc., without taking into account the steel structural part.
(2) Electrical components must be purchased and installed with a explosion-proof certificate or an explosion-proof 3C certificate. If suitable explosion-proof electrical components cannot be obtained, consider using隔爆/positive pressure methods for installation.
(3) The explosion-proof marking of the selected explosion-proof electrical components must not be lower than the explosion-proof marking grade of the entire machine.
(4) Explosion-proof electrical components must be installed, electrical connections, grounding, etc., in compliance with standard requirements.
In the field of obtaining certifications for combined equipment, China New Testing boasts a technical team and industry experience, capable of providing guidance on explosion-proof designs such as positive pressure and explosion-proof.
Guide clients in selecting, installing electrical equipment, and preparing technical drawings, and can also assign engineers for on-site inspections to reduce clients' certification costs and time. Successful certification cases include robots, AGV vehicles, industrial ovens, high and low-temperature chambers, filling machines, dispensing machines, mobile fueling units.
Chemical storage cabinets, dust removal equipment, etc. Feel free to message us for further discussion if you have any needs in this area.
Explosion-proof Certification Application Consulting Service - Shenzhen Zhongnuo Testing Technology Co., Ltd.