The core cycle for the inspection of explosion-proof electrical equipment is once every three years, which is mainly based on the national standards AQ 3009-2007 and the GB/T 3836 series. The inspection must be conducted by institutions with professional qualifications.
I. Cycle for the Inspection of Explosion-Proof Electrical Equipment
1. Mandatory Inspection Requirements
Professional inspection cycle: No more than 3 years, as stipulated in Clause 5.2.4 of AQ 3009-2007.
Routine inspection: Conducted by the enterprise itself, with a cycle shorter than 3 years.
2. Special Circumstances
The inspection cycle shall be shortened in high-temperature or corrosive environments.
Re-inspection is required after equipment modification.
II. National Standards for the Inspection of Explosion-Proof Electrical Equipment
1. Core Standard System
AQ 3009-2007 Code of Safety for Electrical Explosion-Proof in Hazardous Areas
Specifies the inspection cycle, inspection items and filing requirements.
GB/T 3836 Series
GB 3836.1-2021: General Requirements for Equipment.
GB 3836.15-2024: Newly Added Code for the Design of Electrical Installations.
GB 50058-2014 Code for Design of Electrical Installations in Explosive Atmosphere Environments
2. Inspection Contents
Standardization of equipment selection and installation.
Line insulation and grounding status.
Integrity of explosion-proof structures (e.g., clearance of flameproof joint surfaces).
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