Shenzhen Zhongnuo Inspection & 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 non-compliant items.
Do explosion-proof areas require regular inspections? Which standard stipulates this?
In explosive hazard zones, the installation and use of explosion-proof equipment is a basic requirement. In addition, strict explosion-proof requirements must be met for wiring, grounding, ventilation, penetration through walls, explosion relief, and explosion resistance in such areas.
Do these locations require regular inspections?
Yes. According to the AQ 3009-2007 "Electrical Safety and Explosion Protection Specification for Hazardous Areas," in addition to routine inspections, these locations must undergo regular explosion-proof checks by a qualified third-party organization to ensure safety.

Do you need to conduct a explosion-proof electrical inspection and acceptance report after construction at an explosion-proof site? What standards are followed?
The explosion-proof performance of explosion-proof products is not just about the equipment itself; it also involves the selection of the equipment, installation methods, on-site wiring, and daily maintenance and care practices.
Improper selection and installation of explosion-proof equipment, non-compliance with standard wiring requirements on-site, and daily maintenance that damages the equipment's explosion-proof properties can all lead to the loss of explosion-proof capabilities, posing a risk of explosion.
Therefore, the installation and acceptance of the newly introduced explosion-proof equipment is particularly necessary and important.
The explosion-proof acceptance standards are primarily based on AQ 3009, GB/T3836.15, GB/T3836.16, GB 50257, GB 50058, and other standards, with an explosion-proof electrical inspection report issued.
After the installation and acceptance of explosion-proof equipment, it's not a one-time task. To ensure continuous safe operation and long-term use in hazardous areas, continuous supervision and regular inspections of the in-use explosion-proof equipment are also necessary.
The interval for regular inspections generally does not exceed 3 years.
ZhongNuo Inspection has provided on-site explosion-proof electrical inspection and explosion-proof retrofitting construction services for various gas stations, gas stations, oil depots, food factories, feed factories, 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 such on-site requirements, feel free to private message us for specific discussion.

Shenzhen Zhongnuo Testing Technology Co., Ltd. summarizes the experience from previous explosion-proof electrical inspections and lists the following common non-compliance items in on-site explosion-proof checks for your reference.
Common phenomena include:
1. Corrosion and damage to explosion-proof housing. The protective housing of explosion-proof electrical equipment is damaged due to corrosion from surrounding media, leading to rust penetration, structural deterioration, and loss of original strength, thereby rendering the explosion-proof electrical equipment ineffective in preventing explosions.
2. Explosive-proof protective casing chemically corroded and damaged. The metallic casing becomes electrified under conditions such as electrical leakage or potential drift, and when the electrified metal contacts the air medium, it behaves like a battery's reaction, causing the metallic casing to corrode. This leads to the electrical appliance losing its explosion-proof capability.
3. Damage from external forces and mechanical impacts. Includes damage to the protective shell caused by collisions with other equipment or mechanical materials in the workplace, as well as shell damage due to excessive force during installation.
4. Shell damage due to over-temperature, caused by cold shrinkage and deformation of the protective shell material structure in cold regions due to climate adaptation issues, leading to shell cracking and protective shell damage.
5. Damage caused by improper installation. Damage, loss, and failure of protective functions resulting from the non-compliance with installation requirements during the installation of explosion-proof electrical equipment.
6. Inadequate sealing, including the improper handling of sealing materials during installation and maintenance, loose fitting of sealing surfaces, damaged sealing components, and inappropriate or missing fastening and securing elements, result in insufficient or inadequate explosion-proof performance.
7. Quality issues with explosion-proof electrical equipment: Inadequate material for the explosion-proof housing and unreasonable structural design result in insufficient load-bearing capacity; internal wiring is prone to looseness, and an unreasonable internal circuit can easily cause sparking or overheating; unreasonable mechanical structural components, excessive equipment temperature, and internal water accumulation may lead to failures in explosion-proof electrical equipment.
8. Due to actual changes in hazardous areas caused by production facility alterations, the electrical equipment in the area has not been promptly upgraded to explosion-proof equipment.
9. Incorrect selection of explosion-proof electrical equipment; intrinsic safety electrical equipment used with non-intrinsic safety voltage, and explosion-proof enclosures used for generating light, heat, and other circuitry 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 hazard areas. This is both a requirement of various departments and a high level of attention to personnel and property safety.

After the explosion-proof engineering is completed, it requires a third-party institution with explosion-proof inspection qualifications (Shenzhen Zhongnu Inspection Technology Co., Ltd.) to conduct project acceptance. Only after passing the acceptance can the project be put into use.
Explosion-proof project acceptance criteria
1. The explosion-proof certificate number issued by the inspection unit must be marked on the label of explosion-proof electrical equipment.
2. Types, levels, and groups of explosion-proof electrical equipment should comply with the design.
3. The外壳 of explosion-proof electrical equipment should be free from cracks and damage; the paint should be intact. The cover of the junction box should be securely fastened, with the fixing bolts and anti-loosening devices in place.
4. The ventilation and exhaust systems of positive pressure electrical equipment should be unobstructed, correctly connected, and the installation positions of the inlet and outlet meet the requirements.
5. Excess electrical equipment entry ports should be sealed as per regulations.
6. Installation of sealed devices in electrical circuits should comply with regulations.
7. Wiring engineering for inherently safe electrical equipment should comply with the design; the lines should be marked with a sky blue sign.
8. Electrical equipment grounding or neutral bonding, and anti-static wiring should meet design specifications, with secure and reliable grounding.
On-site Explosion-Proof Electrical Equipment Regular Inspection Consulting Service - Shenzhen ZhongNuo Inspection Technology Co., Ltd.