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Shenzhen Zhongnuo Inspection & Technology Co., Ltd. offers on-site explosion-proof electrical inspection, explosion-proof project acceptance services, and can also provide explosion-proof rectification and construction services for items not meeting inspection standards.
Shenzhen Zhongnuo Inspection Technology Co., Ltd. summarizes the experience from previous explosion-proof electrical inspections and lists the following common non-compliant items observed during on-site explosion-proof inspections for reference.
Common phenomena include:
1. Corrosion and damage to explosion-proof casings. The protective casings of explosion-proof electrical equipment are damaged due to corrosion from surrounding media, leading to rust穿孔, structural deterioration, and loss of original strength, thereby rendering the explosion-proof electrical equipment ineffective in preventing explosions.
2. Explosive-proof protective casing suffers from electrochemical corrosion damage. In situations such as electrical leakage in appliances and potential drift, the metal casing becomes electrified. The contact between the electrified metal and the air medium, akin to a battery's reaction, leads to corrosion of the metal casing. This results in the appliance losing its explosive-proof capability.
3. Damage due to external forces and mechanical impacts. This includes damage to the protective casing caused by collisions with other equipment or mechanical substances on the work site, as well as casing damage resulting from excessive force during installation.
4. Shell damage caused by excessive temperature, resulting from the cold contraction and deformation of the protective shell material due to climate adaptation issues in cold regions, leading to shell fractures and subsequent damage to the protective casing.
5. Damage caused by improper installation. Damage, loss, and failure of protective functions resulting from the failure to install explosion-proof electrical equipment in accordance with the required procedures.
6. Inadequate sealing, including improper handling of sealing materials during installation and maintenance, loose fit of sealing surfaces, damaged sealing components, and unsuitable or missing fasteners for sealing fixation, all contribute to the lack of or insufficient explosion-proof performance.
7. Quality issues with explosion-proof electrical equipment, including substandard material for the explosion-proof housing and an unreasonable structural design that fails to meet required load-bearing capacity; internal wiring is prone to looseness, and an impractical internal circuit can easily cause sparking or overheating; unreasonable mechanical structure components, excessive equipment temperature, and internal water accumulation may lead to malfunctions in explosion-proof electrical equipment.
8. Due to actual changes in hazardous areas caused by production facility modifications, the electrical equipment in the area has not been promptly updated to explosion-proof equipment.
9. Incorrect selection of explosion-proof electrical equipment; intrinsic safety electrical equipment used with non-intrinsic safety voltage, and increased safety enclosures used for lighting, heating, and other circuit equipment.
As an end-user of explosion-proof electrical equipment, it is necessary to conduct regular explosion-proof inspections even if explosion-proof electrical equipment is installed and used in explosive hazardous areas. This is not only a requirement of various departments but also a high level of concern for the safety of personnel and property.

Application Institution for Explosion-Proof Electrical Construction Completion and Acceptance Report
It's widely known that after electrical construction in explosive hazardous areas, a third-party organization must conduct a final inspection. Only upon passing the inspection can the facility 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 items inspected during the acceptance of a 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. Verify that the type, grade, group, environmental conditions, and special markings of explosion-proof electrical equipment comply with regulations.
3. Inspect the shell of explosion-proof electrical equipment for cracks or damage; check if the paint is intact, whether 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, and ensure the oil level meets the specified requirements.
5. Ventilation and exhaust systems of 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 explosion-proof electrical equipment properly sealed in accordance with regulations?
7. Installation of sealed or insulated devices in electrical circuits must comply with regulations.
8. The wiring engineering of 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 neutral bonding of explosion-proof electrical equipment, as well as static electricity grounding, should comply with design requirements and be secure and reliable.
10. At the time of completion and acceptance, the relevant 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 record of the single-side air gap of the stator and rotor for explosion-proof motors with increased safety.
(2) Adjustment records for pressure-relief devices protecting explosion-proof electrical equipment against wind and air pressure, as well as high-temperature records of the equipment's housing during trial operation and test records of the grounding resistance for static electricity protection.
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 of the junction box is securely fastened, the electrical clearances and creepage distances between the live parts and the metal enclosure shall comply with the regulations.
(3) Exhaust outlets of explosion-proof electrical equipment with positive pressure should not blow out sparks. When reducing wind pressure and air pressure, the micro-pressure relay should operate reliably.
(4) The protective and interlock devices of explosion-proof electrical equipment should operate correctly and reliably.

ZhongNuo Inspection offers a range of explosion-proof site safety inspection services:
1. Explosion-proof electrical equipment safety inspection in hazardous areas
2. Explosive Dust Explosion Proof Testing
3. On-site Assessment of Electrical Equipment in Dust Explosion Hazardous Areas
4. Explosion-proof quality inspection and safety acceptance check for explosion-proof work in hazardous explosive areas.
5. Explosion-proof electrical and non-electrical equipment, as well as explosion-proof engineering consulting, renovation, construction, and acceptance.
6. Explosion-proof technology consulting services.

How to conduct explosion-proof safety inspections on in-use electrical equipment?
In accordance with the AQ3009-2007 "Electrical Explosion Protection Safety Code for Hazardous Areas," electrical explosion-proof 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 inspection is to be conducted on-site, requiring the client to provide information such as 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, explosion-proof rectification suggestions or inspection reports 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, and chemical plants. We also offer explosion-proof整改 and construction services for items that fail on-site inspections, with a wealth of successful cases and industry experience. If you need an on-site explosion-proof electrical inspection report, feel free to send us a private message for specific communication.
On-site Explosion Proof Electrical Equipment Regular Inspection Consulting Service - Shenzhen ZhongNuo Testing Technology Co., Ltd.