Shenzhen ZhongNuo Testing 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 non-compliant items.
How often is the periodic inspection for explosion-proof electrical equipment?
With the widespread use of explosion-proof electrical equipment, many explosive hazardous areas have adopted such equipment. Many end-users believe that installing explosion-proof electrical equipment in hazardous areas is sufficient. However, in many cases, the so-called explosion-proof equipment lacks valid certification, or the certification has expired or is fraudulent. There are discrepancies between the markings and the certification, improper selection of explosion-proof types, mixed use of gas and dust explosion-proof equipment, drilling holes in explosion-proof enclosures, long-term corrosion, exposure to high temperatures, and intense vibrations. Regarding the use of explosion-proof electrical equipment, the AQ 3009-2007 "Electrical Safety and Explosion-Proof Regulations for Hazardous Areas" standard stipulates: explosion-proof electrical equipment in use should be inspected by a certification center with specialized expertise at least every 3 years for performance, installation, and maintenance. Immediate corrective actions must be taken for any non-compliance, and the inspection report and corrective measures must be filed with the safety supervision and management department. Conducting on-site explosion-proof inspections for electrical equipment in use is not only a requirement of the safety department but also a demonstration of a company's commitment to its own life and property safety.
ZheNuo Inspection has provided on-site explosion-proof inspections and modification construction services for various facilities such as gas stations, petrol stations, oil depots, food factories, feed factories, and chemical plants, boasting a substantial number 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.

Main contents of regular inspections for explosion-proof electrical equipment
1. Model Inspection
In strict accordance with relevant laws, the explosion-proof marking of explosion-proof electrical equipment must be standardized, and it can only be implemented after passing the relevant explosion-proof standard inspection and obtaining the qualification. It is necessary to design the appropriate explosion-proof type, level, and temperature class for electrical equipment based on the specific working environment.
2. Installation Inspection
During electrical equipment installation, any oversight can potentially lead to losses. For instance, if the ventilation and exhaust system is not properly set up, it may not be sufficiently unobstructed, and the outer shells of electrical equipment can pose an explosion risk during operation. Therefore, meticulousness is crucial during installation, and it must be carried out according to relevant standards.
3. Line Inspection
Electrical equipment is often composed of numerous wires interconnected, often quite complex. If the connections are not secure, or if there are incorrect connections, or due to insulation layer peeling off from the wires, it may cause short circuits or overloads, leading to phenomena such as arcs or sparks. Therefore, it is crucial to enhance the inspection of circuit integrity, especially the sealing of the wires, to ensure the connections meet the required standards.
4. Grounding Inspection
Electrical equipment generates static electricity during operation. When there's an excessive amount of static, sparks may occur upon discharge. Therefore, proper grounding protection is essential to promptly dissipate static electricity and prevent explosions. Common grounding methods include working grounding, static grounding, and lightning protection grounding. Engineers must select the appropriate grounding method based on the specific working environment and ensure that the grounding is safe and secure.

Materials Required for On-Site Explosion-Proof Inspection Application
1. Explosion-proof area size of the site.
2. Explosive Hazard Area Mapping Diagram
3. Names of explosive hazardous substances within the corresponding danger zones and their Material Safety Data Sheets (MSDS)
4. Explosion-proof electrical product list, including installation area and serial number information
5. Copies of explosion-proof electrical products' explosion-proof certification
6. Instructional document on special usage conditions for explosion-proof electrical equipment
7. Descriptive Technical Document on Intrinsically Safe System
8. Relevant documents regarding installation quality

Shenzhen ZhongNuo Inspection Technology Co., Ltd. summarizes the experience from past explosion-proof electrical inspections and lists the following common non-conforming items in on-site explosion-proof checks for your 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 the surrounding medium, leading to rust穿孔, structural deterioration, and loss of original strength, thereby rendering the explosion-proof electrical equipment ineffective in preventing explosions.
2. Explosion-proof protective casing subjected to electrochemical corrosion and damage. In situations such as electrical leakage or potential drift, the metal casing becomes electrified. When the electrified metal contacts the air medium, it behaves like a battery, causing corrosion of the metal casing. This leads to the loss of the electrical appliance's explosion-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 due to excessive temperature, caused by cold shrinkage deformation of the protective shell material structure in cold regions due to climate adaptation issues, leading to shell fracture and subsequent damage to the protective shell.
5. Damage due to improper installation. Damage, loss, and failure of protective functions caused by not following installation requirements during the process of installing explosion-proof electrical equipment.
6. Inadequate sealing, including the use of sealing materials not meeting requirements during installation and maintenance, loose mating of sealing surfaces, damaged sealing components, and inappropriate or missing fasteners for securing the sealing, resulting in inadequate or weak explosion-proof performance.
7. Quality issues with explosion-proof electrical equipment: Inadequate material for the explosion-proof housing and unreasonable structural design lead to insufficient load-bearing capacity; internal wiring is prone to looseness, and an unreasonable internal circuit may 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 changes in production facilities, the electrical equipment in the area has not been timely upgraded to explosion-proof equipment.
9. Incorrect selection of explosion-proof electrical equipment; inherently safe electrical equipment used with non-inherently safe voltages; increased safety enclosures used for light, heat, and other circuit equipment.
As an end-user of explosion-proof electrical equipment, it is necessary to conduct regular explosion-proof inspections on these devices, even in explosive hazard areas where explosion-proof electrical equipment is installed and used. This is both a requirement of various departments and a high level of attention to personnel and property safety.
On-site explosion-proof electrical equipment regular inspection consulting service - Shenzhen Zhongnuo Inspection Technology Co., Ltd.