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.
Explosion-proof Site Safety Inspection Standards
1. GB 50058-2014 "Code for Design of Electrical Installations in Explosive Hazardous Environments"
2. GB 3836.14-2014 "Part 14: Classification of explosive atmospheres — Explosive gas environments"
3. AQ 3009-2007 Electrical Explosion-Proof 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"

Materials Required for On-Site Explosion-Proof Inspection Application
1. Explosion-proof area size.
2. Explosion Hazard Area Division Map
3. Names of explosive hazardous substances within the relevant danger zones and their Material Safety Data Sheets (MSDS)
4. Explosion-proof electrical products list, including installation area and number information
5. Copies of explosion-proof electrical products' explosion-proof certification
6. Instructions for Special Application Conditions of Explosion-Proof Electrical Equipment
7. Descriptive Technical Document for Intrinsically Safe System
8. Installation quality-related materials

Report Application Institution for Explosion-Proof Electrical Construction Completion Inspection
It's widely known that after electrical work is completed in explosive hazard areas, a third-party organization must conduct a final inspection before the facility can be put into use. Additionally, beyond the company's regular checks, a facility with explosion-proof inspection qualifications must carry out periodic inspections every three years.
What are the main contents of the acceptance inspection after completion?
1. Check if the explosion-proof electrical equipment has a label, Ex symbol, and clear identification of the type, level, and group of the explosion-proof equipment. Is the label marked with the explosion-proof qualification number issued by the inspection unit?
2. Verify that the type, class, group, environmental conditions, and special markings of explosion-proof electrical equipment comply with regulations.
3. Inspect the casing of explosion-proof electrical equipment for cracks or damage; check if the paint is intact, if the junction box cover is securely fastened, and if the fixing bolts and anti-loosening devices are in place.
4. Inspect oil-filled electrical equipment for oil leakage and seepage, ensuring the oil level meets the specified requirements.
5. Ventilation and exhaust systems for explosion-proof electrical equipment with positive pressure should be unobstructed, connections should be proper, and the import and export installation positions should meet the requirements.
6. Are the excess entry ports of the explosion-proof electrical equipment properly sealed in accordance with regulations?
7. The installation of sealed or insulated devices in electrical circuits shall comply with regulations.
8. The wiring project for intrinsic safety explosion-proof electrical equipment shall comply with design requirements for the route and elevation of the lines; the lines should be marked with a sky blue sign.
9. The grounding or earthing of explosion-proof electrical equipment, as well as static electricity grounding, should comply with design requirements and be firm and reliable.
10. Upon completion and acceptance of the project, relevant documents, materials, the manufacturer's product instruction manual, test records, qualification certificates, and installation drawings, etc., should be submitted as technical files.
11. At the time of inspection, the following measurement records should also be submitted:
Measurement records of single-side air gap for explosion-proof motor stator and rotor.
(2) Adjustment records for pressure-relief devices in explosion-proof electrical equipment, such as wind pressure and air pressure relays; high-temperature records of the equipment's housing during trial operation; and test records of static dissipative grounding resistance values.
12. Operation records of explosion-proof electrical equipment
The shell temperature of explosion-proof electrical equipment, including intrinsically safe and non-sparking explosion-proof electrical equipment, should not exceed the specified value.
(2) After internal wiring in the junction box is securely fastened, the electrical clearances and creepage distances between live parts and the metal housing should comply with the regulations.
(3) The exhaust of explosion-proof electrical equipment with positive pressure should not emit sparks. The micro-pressure relay should operate reliably when reducing wind pressure and air pressure.
(4) The protective devices and interlock devices of explosion-proof electrical equipment should operate correctly and reliably.

How to conduct explosion-proof safety inspections for electrical equipment in use?
In accordance with the AQ3009-2007 "Electrical Explosion-Proof Safety Regulations for Hazardous Areas," explosion-proof electrical equipment in use must undergo a periodic explosion-proof inspection at least every 3 years to ensure their explosion-proof performance. The inspection items include the selection, installation, wiring, static electricity, grounding, etc., of explosion-proof equipment. The inspection methods include visual inspections, general inspections, and detailed inspections. This requires on-site checks, where the client must provide information on the area of the explosion-proof zone, the number of electrical equipment, and the MSDS of the site. After the on-site inspection is completed, a report with explosion-proof improvement suggestions or an explosion-proof inspection report will be issued based on the actual situation.
ZhongNuo Inspection has provided on-site explosion-proof electrical inspection services for various facilities such as gas stations, oil depots, food factories, feed mills, chemical plants, etc. We also offer explosion-proof整改 and construction services for non-compliant items identified during on-site inspections, with a wealth of successful cases and industry experience. If you need to conduct on-site explosion-proof electrical inspection reports, feel free to private message us for specific discussions.
On-Site Explosion Proof Electrical Equipment Regular Inspection Consulting Service - Shenzhen Zhongnuo Inspection Technology Co., Ltd.