Shenzhen Zhongnuo Inspection & Technology Co., Ltd. offers on-site explosion-proof electrical inspection, explosion-proof project acceptance services, and consulting. We also provide explosion-proof rectification and construction services for non-compliant items.
Dust Explosion Hazardous Area Safety Inspection Regulations
GB15577-2018 Dust Explosion Protection Safety Code
GB 17440-2008 Dust Explosion Prevention Safety Standard for Food Processing Enterprises
GB17918-2009 Dust Explosion Prevention Safety Regulations for Bulk Grain Handling Systems at Ports
AQ4229-2013 Grain Storage Silo Dust Explosion Prevention Safety Standard
AQ4230-2013 Dust Explosion Prevention Safety Code for Grain Flat Storage Buildings
AQ4232-2013 Specification for Dust Explosion Prevention in Plastic Production Systems
GB18245-2000 Dust Explosion Prevention Safety Regulations for Processing Systems
GB19081-2008 Dust Explosion Prevention Safety Regulations for Feed Processing Systems
GB16543-2008 Safety Code for Dust Explosion Prevention in Blast Furnace Injection Coal System
GB17269-2003 Aluminum Processing System Dust Explosion Prevention Safety Standard
GB/T 16505-1995 Guide for Dust Explosion Relief
GB/T 17919-2009 Guidelines for Explosion-proof Dust Collector in Hazardous Dust Explosion Areas
GB 12158-2006 General Guidelines for Preventing Static Electricity Accidents
AQ3009-2007 Electrical Explosion Protection Safety Code for Hazardous Areas
GB 50058-2014 Code for Design of Power Installations for Explosive and Fire Hazardous Environments
GB50257-2014 Code for Electrical Installation Engineering in Explosive and Flammable Gas and Dust Hazardous Environments, Electrical Construction and Acceptance Procedures

Shenzhen Zhongnuo Testing Technology Co., Ltd. summarizes the experience from previous explosion-proof electrical inspection and identifies common non-conformities during on-site explosion-proof electrical inspections:
Currently, hazardous chemical production enterprises in our country frequently experience accidents, thus demanding great emphasis on safety production inspections. We should gradually explore the safety performance of products and equipment involving personal safety, and step by step establish a significant role in safety production inspections. Now, through safety inspections, many technical supports can be provided to hazardous chemical enterprises, particularly the electrical explosion-proof safety inspections, which should be widely promoted, continuously guiding and serving the enterprises in their safety production efforts.
Improper design within the hazardous area
Many companies are constrained by their corporate history, and at the same time, the production materials of the enterprises are continuously changing, which makes the demarcation of hazardous areas less tidy and appears rather chaotic. The layout of equipment and facilities fails to meet the explosion-proof requirements.
2. Understanding of explosion-proof knowledge is relatively weak
In many hazardous chemical enterprises, there is a lack of distinction between electrical explosion-proof safety inspections and fire protection electrical and building electrical inspections. There is a significant lack of standardization in temporary electrical use, firework operations, equipment replacements, and electrical management systems.
3. Improper installation of explosion-proof electrical equipment
Many companies have explosion-proof functions in their electrical facilities, but issues in installation are still numerous. For example, direct connection of main cables, missing explosion-proof face screws, and using PVC pipes for wiring through incoming and outgoing pipelines. Additionally, the installation of switches and sockets, terminal blocks, power and lighting distribution boxes, grounding systems, and wiring systems are not very rational, with many safety concerns.
4. Explosion-proof electrical wiring routing does not meet requirements
In explosive environments, most companies currently do not pay enough attention to explosion-proof electrical wiring, fail to correctly understand the technical parameters of hazardous materials in dangerous areas, and often wire randomly.
5. Non-standard grounding of explosion-proof electrical equipment
For the grounding of explosion-proof electrical equipment, there are mainly internal neutral grounding, casing protective grounding, and antistatic grounding. The grounding of unpowered metal casings is often poorly done, with frequent occurrences of grounding wires being connected to material pipelines.
6. Lack of overall planning for explosion-proof zones in the selection of power distribution rooms and control rooms.
Many distribution and control rooms are located within explosion-proof zones without proper explosion-proof measures in place.
7. Inadequate explosion-proof selection and requirements for explosion-proof electrical equipment
In electrical explosion-proof facilities, there is no distinction between environments with combustible dust and those with explosive gases; they are used interchangeably. Different hazardous areas have varying electrical explosion-proof specifications, explosion-proof markings, and types, as well as different levels and temperature classes. However, many companies mix and match explosion-proof electrical equipment without distinguishing these differences.

Do you need to conduct an explosion-proof electrical inspection and acceptance report after construction at an explosion-proof site? What standards are followed?
The explosion-proof performance of explosion-proof products is not just about the equipment itself, but also involves the equipment selection, installation methods, on-site wiring, and daily maintenance and care practices.
Improper selection and installation of explosion-proof equipment, non-compliance with standard wiring requirements on-site, and daily maintenance that damages the equipment's explosion-proof performance can all lead to the loss of explosion-proof characteristics in the equipment, posing a risk of explosion.
Therefore, the installation and acceptance of the newly introduced explosion-proof equipment is particularly necessary and important.
The explosion-proof acceptance standards are mainly based on AQ 3009, GB/T3836.15, GB/T3836.16, GB 50257, GB 50058, and other standards, with an explosion-proof electrical inspection report issued.
After the installation and acceptance of explosion-proof equipment, it's not a one-time task. To ensure the equipment operates effectively and can be used safely in hazardous areas over the long term, continuous supervision and regular inspections of the in-use explosion-proof equipment are mandatory.
The interval for regular inspections generally does not exceed 3 years.
ZhongNuo Inspection has provided on-site explosion-proof electrical inspection and explosion-proof transformation construction services for various gas stations, petrol stations, oil depots, food factories, feed mills, chemical plants, etc., with a wealth of successful cases and industry experience.
If you happen to need a防爆电气检查报告 for such on-site requirements, feel free to message us for detailed discussion.

What qualifications are required for regular inspection of explosion-proof electrical equipment?
The periodic inspections of explosion-proof electrical equipment, as mentioned in the previous section, in accordance with the AQ 3009-2007 "Electrical Safety and Explosion Protection Regulations for Hazardous Areas," must be conducted by a certified inspection center with expertise in explosion-proof. This certification is authorized by the CNAS through the human resources department, and can be verified on the CNAS website.
On-Site Explosion-Proof Electrical Equipment Regular Inspection Consultancy Service - Shenzhen Zhongnuo Testing Technology Co., Ltd.