Shenzhen Zhongnuo Testing Technology Co., Ltd. offers on-site explosion-proof electrical inspection, explosion-proof project acceptance services, and consulting services. We also provide explosion-proof rectification and construction services for items that do not meet inspection standards.
Shenzhen ZhongNuo Testing Technology Co., Ltd. summarizes past experience in explosion-proof electrical inspections, common non-conforming items found during on-site explosion-proof electrical inspections:
Currently, hazardous chemical production enterprises in our country frequently experience accidents, thus demanding a high priority on safety production inspections. We should gradually explore the safety performance of products and equipment involving personal safety, and step by step, establish their significant role in safety production inspections. Now, safety inspections can provide substantial technical support to hazardous chemical enterprises, particularly the electrical explosion-proof safety inspections, which should be widely promoted, continuously guiding and serving the enterprises in ensuring safe production.
1. Inadequate design within hazardous areas
Many companies are constrained by their corporate history, and at the same time, the production materials are continuously changing, resulting in an irregular division of hazardous areas, appearing rather chaotic, and the layout of equipment and facilities does not meet 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 prevention electrical and building electrical inspections. There are also irregularities in temporary electrical use and firework operations, as well as in equipment replacement and electrical management systems.
3. Improper installation of explosion-proof electrical equipment
Although many companies now have explosion-proof functions in electrical facilities, there are still many issues in installation, such as direct wiring connections, missing explosion-proof face screws, and using PVC pipes for wiring in incoming and outgoing pipelines. Additionally, the installation of switches and outlets, wiring terminals, power and lighting distribution boxes, grounding systems, and electrical wiring systems is not very reasonable, 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 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 antistatic grounding. The grounding of unpowered 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 power 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, they do not differentiate between environments with combustible dust and those with explosive gases; they are mixed and used together. Different hazardous areas have distinct electrical explosion-proof specifications, explosion-proof markings, and types. Additionally, there are variations in levels and temperature categories. However, many companies mix and match explosion-proof electrical equipment without distinguishing these differences.

ZhongNuo Inspection offers explosion-proof site safety inspection services.
1. Hazardous Area Explosion-Proof Electrical Equipment Safety Inspection
2. Explosive Dust Explosion Proof Testing
3. On-site Evaluation of Electrical Equipment in Dust Explosion Hazards Areas
4. Explosion-proof quality inspection for hazardous explosive areas and explosion-proof safety acceptance inspection.
5. Explosion-proof electrical and non-electrical equipment, as well as explosion-proof engineering consulting, renovation, construction, and acceptance.
6.防爆技术咨询 services.

Report on Explosion-Proof Electrical Construction Completion Inspection Application Institution:
It's widely known that after electrical work in explosive hazard areas is completed, third-party organizations must conduct post-completion inspections. Only upon passing these inspections can the facilities be put into use. Additionally, besides the company's regular checks, a facility with explosion-proof inspection qualifications must carry out periodic inspections every three years.
What are the main items inspected during the acceptance of the completed project here?
1. Check if the explosion-proof electrical equipment has a label, an Ex mark, and clear identification of the type, class, and group of the explosion-proof equipment. Does the label indicate the explosion-proof certificate number issued by the inspection unit?
2. Inspect the type, class, group, environmental conditions, and special markings of explosion-proof electrical equipment to ensure compliance with regulations.
3. Inspect the outer shell of explosion-proof electrical equipment for cracks or damage; ensure the paint is intact, that the junction box cover is securely fastened, and that the fixing bolts and anti-loosening devices are in place.
4. Check for oil leakage and seepage in oil-filled electrical equipment, and ensure the oil level meets the required specifications.
5. Ventilation and exhaust systems for explosion-proof electrical equipment with positive pressure should be unobstructed, connections should be correct, and the installation positions of inlets and outlets 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 should comply with regulations.
8. Wiring engineering for intrinsically safe explosion-proof electrical equipment must comply with design requirements regarding the route and elevation of the lines; the lines should be marked with a sky blue sign.
9. Grounding or neutral bonding of explosion-proof electrical equipment, as well as antistatic grounding, should meet design specifications, with secure and reliable grounding.
10. At the time of completion and acceptance, the corresponding documents, materials, manufacturer's product user manuals, test records, qualification certificates, and installation drawings, along with other technical files, should be submitted.
11. At the time of inspection, the following measurement records should also be submitted:
Measurement records of single-side air gap for explosion-proof motors with increased safety design, stator and rotor.
(2) Adjustments records for pressure-relief devices protecting explosion-proof electrical equipment, such as wind and air pressure relays; high-temperature records of the equipment's housing during trial operation; and test records of static electricity grounding resistance values.
12. Record of explosion-proof electrical equipment operation
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 the internal wiring in the junction box is securely fastened, the electrical clearances and creepage distances between live parts and between them and the metal enclosure shall comply with the regulations.
(3) The exhaust of explosion-proof electrical equipment with positive pressure should not blow out sparks. The micro-pressure relay should operate reliably when reducing wind pressure and air pressure.
(4) The protective and interlock devices of explosion-proof electrical equipment should operate correctly and reliably.

How often should explosion-proof electrical equipment be inspected? How to apply for an explosion-proof electrical equipment inspection report?
Should explosion-proof electrical equipment in use be checked regularly? How often should a check report be made? What standards are explicitly mentioned, and how are they specified? These are questions that many owners and clients in explosive-hazardous industries such as chemicals, grain and oil, and gas stations are eager to know. ChinaNuo Testing will simply answer these questions for you.
Due to the industry's特殊性, facilities with explosive hazards must purchase and install equipment with valid explosion-proof certification, and ensure proper installation and maintenance. In addition, regular safety performance checks and routine maintenance of these electrical devices must be conducted to confirm their continued explosion-proof capabilities. AQ3009-2007 "Electrical Explosion-Proof Safety Regulations for Hazardous Areas" also stipulates that periodic inspections should be carried out by safety inspection and testing institutions with explosion-proof qualifications, with intervals generally not exceeding 3 years.
ZhongNuo Inspection has provided on-site explosion-proof inspections and renovation services for various gas stations, gas 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 report on explosion-proof electrical inspections for on-site work, feel free to message us for specific discussions.
On-Site Explosion-Proof Electrical Equipment Regular Inspection Consultancy Service - Shenzhen Zhongnuo Inspection Technology Co., Ltd.