Shenzhen Zhongnuo Testing Technology Co., Ltd. offers on-site explosion-proof electrical inspection, explosion-proof project acceptance services, and can provide explosion-proof rectification and construction services for items not meeting inspection standards.
ZhongNuo Inspection offers explosion-proof site safety inspection services.
1. Explosion-proof safety inspections for electrical equipment in hazardous areas
2. Explosive Dust Explosion Proof Testing
3. On-Site Assessment of Electrical Equipment in Dust Explosion Areas
4. Explosion-proof quality inspection of anti-explosion work in 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. Explosion-proof technology consulting services.

Application Institution for Explosion-Proof Electrical Construction Completion Inspection Report
It's widely known that after electrical work in explosive hazard areas is completed, a third-party organization must conduct a final inspection before the facility can be put into use. Additionally, apart from regular checks by the company itself, a facility with explosion-proof inspection qualifications must carry out inspections every three years.
What are the main items inspected during the completion acceptance here?
1. Check if the explosion-proof electrical equipment has a label, Ex marking, and clear identification of the type, class, and group of the explosion-proof equipment. Is the label marked with 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, the junction box cover is securely fastened, and the fixing bolts and anti-loosening devices are in place.
4. Ensure that oil-filled electrical equipment is checked for oil leakage and seepage, and the oil level should meet the required standards.
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 excess entry ports of explosion-proof electrical equipment properly sealed in accordance with regulations?
7. Installation of sealed or insulated devices in electrical circuits should comply with regulations.
8. The wiring engineering of intrinsic safety explosion-proof electrical equipment shall comply with design requirements for the routing and elevation of the lines; the lines should be marked with a sky blue sign.
9. The grounding or earthing of explosion-proof electrical equipment, as well as static electricity grounding, should comply with design requirements and be firm and reliable.
10. Upon completion and acceptance, the following technical documents should be submitted: relevant files, materials, manufacturer's product user manuals, test records, qualification certificates, and installation drawings.
11. At the time of inspection, the following measurement records should also be submitted:
Record of measurement for the single-side air gap of the stator and rotor in explosion-proof motors with increased safety.
(2) Adjustment records for pressure relief devices, such as wind and pressure relays, on explosion-proof electrical equipment; high-temperature records of the equipment's housing during trial operation; and test records of the grounding resistance for anti-static grounding.
12. Explosion-proof electrical equipment operation records
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 between the live parts and the metal enclosure shall comply with the regulations.
(3) The exhaust of explosion-proof electrical equipment with positive pressure should not emit 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.

Standard and cycle for regular inspections of explosion-proof electrical equipment
With the increasing popularity of explosion-proof electrical equipment, many hazardous explosive areas have installed and utilized explosion-proof electrical appliances.
Many end-users believe that as long as explosion-proof electrical equipment is installed in hazardous explosive areas, everything is settled.
In many cases, so-called explosion-proof electrical appliances do not have a valid explosion-proof certificate, or the certificate has expired or is counterfeit. The label does not match the explosion-proof certificate.
Selection of explosion-proof type is incorrect, mixed use of gas explosion-proof electrical equipment and dust explosion-proof electrical equipment, improper wiring of explosion-proof electrical equipment installation, circuit not grounded.
Holes in explosion-proof casings and the installation of buttons can cause explosion-proof failure. Long-term exposure to corrosion, high temperatures, and severe vibrations can affect explosion-proof electrical equipment.
For explosion-proof electrical equipment in use, the AQ 3009-2007 "Electrical Safety and Explosion-Proof Regulations for Hazardous Areas" standard stipulates:
Electrical explosion-proof equipment in use should be inspected by a certified explosion-proof inspection center at least once every 3 years to check its performance, installation, maintenance, etc.
Immediate corrective actions must be taken for items not meeting inspection standards, and the inspection report and rectification details must be filed with the Safety Production Supervision and Management Department.
Conducting on-site explosion-proof inspections for electrical equipment in use is not only a requirement of the safety production department, but also a testament to the company's emphasis on its own life and property safety.

The standard(s) referenced in the "Electrical Explosion Proof Inspection Report" issued from regular inspections of explosion-proof electrical equipment include, but are not limited to:
GB50058-2014 "Code for Design of Electrical Installations in Explosive Hazardous Environments"
GB50257-2014 Specification for Construction and Acceptance of Electrical Installations in Explosion and Fire Hazardous Environments
GB/T 3836.15-2017 "Electrical Equipment for Explosive Gas Atmospheres — Part 15: Electrical Installations in Hazardous Areas (Excluding Mines)"
AQ3009-2007 Electrical Explosion Protection Safety Code for Hazardous Areas
On-Site Explosion-Proof Electrical Equipment Regular Inspection Consultancy Service - Shenzhen ZhongNuo Testing Technology Co., Ltd.