Shenzhen ZhongNuo Inspection & Technology Co., Ltd. offers on-site explosion-proof electrical inspection, explosion-proof project acceptance services, and can provide explosion-proof rectification and construction services for items not meeting inspection standards.
Materials required for on-site explosion-proof inspection application
1. Area of explosion-proof site
2. Explosion Hazard Zone Division Map
3. Names of explosive hazardous substances within the corresponding danger zones, along with their Material Safety Data Sheets (MSDS)
4. List of explosion-proof electrical products, including installation area and identification numbers, etc.
5. Copies of explosion-proof electrical products' explosion-proof certification
6. Instructions for Special Usage Conditions of Explosion-Proof Electrical Equipment
7. Descriptive Technical Document for Intrinsically Safe Systems
8. Installation quality-related materials

Shenzhen Zhongnuo Testing Technology Co., Ltd. summarizes the experience from previous explosion-proof electrical inspection, common non-conformities found during on-site explosion-proof electrical inspections:
Currently, hazardous chemical production enterprises in our country are prone to frequent accidents, thus, it is of utmost importance to pay great attention to safety production inspections. We should gradually explore the safety performance of products and equipment involving personal safety, and step by step, form an important role in safety production inspections. Now, safety inspections can provide many technical supports to hazardous chemical enterprises, especially the electrical explosion-proof safety inspections, which should be widely promoted, continuously guiding and serving the enterprises' safe production.
1. Inadequate design in hazardous areas
Many companies are constrained by their corporate history, and at the same time, the production materials of the enterprises are continuously changing, making the demarcation of hazardous areas uneven and rather chaotic. The layout of equipment and facilities does not 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 lack of standardization in temporary power usage, firework operations, equipment replacement, and electrical management systems.
3. Improper installation of explosion-proof electrical equipment
Although many companies now have explosion-proof features in their electrical facilities, installation issues are still prevalent. For instance, direct connection of main power lines, missing explosion-proof face screws, and using PVC pipes for wiring in incoming and outgoing pipelines. Additionally, the installation of switches and sockets, wiring terminals, power and lighting distribution boxes, grounding systems, and electrical wiring systems is 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 place enough emphasis on explosion-proof electrical wiring, fail to correctly understand the technical parameters of hazardous materials in dangerous areas, and often install wiring arbitrarily.
5. Non-standard grounding of explosion-proof electrical equipment
For explosion-proof electrical equipment grounding, there are mainly internal neutral grounding, housing protective grounding, and static dissipative grounding. The grounding of uninsulated metal housing is often poorly done, frequently resulting in 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 but lack adequate explosion-proof measures.
7. Inappropriate explosion-proof selection and requirements for electrical equipment
In electrical explosion-proof facilities, they do not differentiate between environments with combustible dust and those with explosive gases; they are mixed and used together. In different hazardous areas, there are varying electrical explosion-proof specifications, explosion-proof markings, and types, as well as different levels and temperature groups. However, many enterprises mix and use explosion-proof electrical equipment without distinguishing these differences.

Regulations and laws regarding regular inspections of explosion-proof electrical equipment:
Explosion-proof equipment used in hazardous areas must undergo a series of life cycles, including production, installation, operation, inspection, maintenance, and withdrawal from the market.
Regular inspections provide a strong guarantee for their usage conditions and explosion-proof safety performance. Relevant laws and regulations in our country also have corresponding provisions.
In the standard AQ3009-2007 "Electrical Safety and Explosion Protection in Hazardous Areas" there are explicit provisions:
Regular inspections should be entrusted to a safety production inspection agency with explosion-proof professional qualifications, with the interval generally not exceeding 3 years.
The company should take corrective actions promptly based on the inspection results and file the inspection report and the rectification status with the safety production supervision and management department.
In the preface of AQ3009-2007 "Electrical Safety and Explosion-proof Regulations for Hazardous Areas," it is explicitly stated that Chapter 4, Chapter 5, Chapter 6, and Chapter 7 are mandatory and must be strictly enforced. Therefore, such safety regulations are also part of the legal and regulatory framework and must be strictly enforced!

Explosion-proof Site Safety Inspection Standards
1. Code for Design of Electrical Installations in Explosive Hazardous Environments - GB 50058-2014
2. GB 3836.14-2014 "Part 14: Classification of Explosive Atmospheres - Explosive Gas Atmospheres"
3. AQ 3009-2007 "Electrical Explosion Protection Safety Code for Hazardous Areas"
4. GB 50257-2014 "Electrical Installation Engineering, Construction and Acceptance of Electrical Installations in Explosive and Fire Hazardous Environments"
5. GB15577-2018 "Safety Code for Dust Explosion Prevention"
On-Site Explosion-Proof Electrical Equipment Regular Inspection Consultancy Service - Shenzhen ZhongNuo Inspection Technology Co., Ltd.