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.
How often should explosion-proof electrical equipment be inspected? How to obtain an explosion-proof electrical inspection report?
Should explosion-proof electrical equipment in use be checked regularly? How often should a check report be issued? What standards are explicitly stated, and how are they defined? These are questions that many clients with explosive hazards in industries like chemicals, grain and oil, and gas stations are eager to know. China Nu Inspection provides a simple explanation.
Due to the industry's specificity, facilities with explosive hazards must purchase and install equipment with a legitimate explosion-proof certification, and ensure proper installation and maintenance. In addition, regular safety checks and daily maintenance of these electrical devices for their explosion-proof performance must be conducted to confirm their continued suitability. The AQ3009-2007 "Electrical Explosion-Proof Safety Regulations for Hazardous Areas" also stipulates that regular inspections should be carried out by qualified safety inspection and testing institutions with explosion-proof qualifications, with intervals generally not exceeding three years.
ZhongNuo Inspection has provided on-site explosion-proof inspections and modification services for various gas stations, gas stations, oil depots, food factories, feed factories, and chemical plants, with a wealth of successful cases and industry experience.
If you happen to need a report for on-site explosion-proof electrical inspections, feel free to private message us for a detailed discussion.

Explosion-proof Field Safety Inspection Standards
1. Specification for Design of Electrical Installations in Explosive Hazardous Environments - GB 50058-2014
2. GB 3836.14-2014 "Part 14: Classification of Explosive Atmospheres - Explosive Gas Atmospheres"
3. AQ 3009-2007 "Safety Code for Electrical Explosion Protection in 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"

Shenzhen Zhongnuo Testing Technology Co., Ltd. summarizes the experience from previous explosion-proof electrical inspections and compiles the following common non-compliant items observed during on-site explosion-proof inspections 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 the surrounding medium, leading to rust penetration, structural degradation, and loss of original strength, causing the explosion-proof electrical equipment to lose its explosion-proof capability.
2. Explosion-proof protective casing chemically corroded and damaged. The metallic casing, when the electrical equipment leaks electricity or experiences potential drift, becomes electrified. The charged metal contacting the air medium is akin to a battery's reaction, causing corrosion of the metallic casing. This leads to the loss of the electrical equipment'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 overtemperature, caused by cold shrinkage and deformation of the protective shell material structure in cold regions due to climate adaptation issues, leading to shell breakage and subsequent damage to the protective shell.
5. Damage caused by improper installation. Damage, missing parts, and loss of protective functions resulting from the failure to install explosion-proof electrical equipment in accordance with the specified requirements.
6. Inadequate sealing, including improper handling of sealing materials during installation and maintenance, loose joints on the sealing surfaces, damaged sealing components, and unsuitable or missing fasteners for sealing fixation, all contribute to a 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 facilities are prone to loosening, and an irrational 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 the alteration of production facilities, the electrical equipment in the area has not been promptly updated to explosion-proof equipment.
9. Incorrect selection of explosion-proof electrical equipment, using non-intrinsic safety voltage for intrinsic safety electrical equipment and explosion-proof enclosures for generating light, heat, and other electrical circuits.
As an end-user of explosion-proof electrical equipment, even in explosive hazardous areas where explosion-proof electrical equipment is installed and used, regular explosion-proof inspections of these devices are necessary. This is both a requirement of various departments and a testament to the high importance placed on personnel and property safety.

Regular Inspections of Explosion-Proof Electrical Equipment
1. Model Inspection
In strict accordance with relevant laws, the explosion-proof markings on explosion-proof electrical equipment must be standardized, and the equipment must pass the corresponding explosion-proof standard inspections and be deemed qualified before implementation. It is essential 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 installed and is not sufficiently unobstructed, or if the electrical equipment casing has the potential to explode during electrical operation, these can pose significant risks. Therefore, meticulous attention must be given to the installation process, ensuring it adheres strictly to relevant standards.
3. Wire inspection
Electrical equipment is often composed of a large number of interconnected wires, which can be particularly complex. If they are not securely connected, or if there are incorrect connections, or if the insulation of the wires peels off, it may lead to short circuits or overloads, resulting in arcs or sparks. Therefore, it is crucial to strengthen inspections of the circuit, especially the密封 of the wires, to ensure that the connections meet the requirements.
4. Grounding Inspection
Electrical equipment generates static electricity during operation. If there's an excessive amount of static, sparks may occur upon discharge. Therefore, proper grounding protection is essential to promptly discharge the static and prevent explosions. Common grounding methods include working grounding, static grounding, and lightning protection grounding, etc. Engineers must select the appropriate grounding method based on the specific working environment and ensure that the grounding is safe and secure.
On-site Explosion-Proof Electrical Equipment Regular Inspection Consultancy Service - Shenzhen ZhongNuo Inspection Technology Co., Ltd.