Yunfu Explosion-proof Project Acceptance Standard, Shenzhen ZhongNuo Inspection

Shenzhen ZhongNuo Testing Technology Co., Ltd. is based in South China and offers consulting services in explosion-proof construction, safety inspections, renovations, project acceptance, and explosion-proof installations. We are well-versed in explosion-proof construction standards and boast experienced construction teams with a wealth of practical experience. We've served major corporations like PetroChina, LG, Huanlan Environment, BOE, and Sinovac, earning consistent praise and trust from our clients!
Basic knowledge for explosion-proof electrical installation includes the following points:
Explosive material classification, grouping, and classification of explosive hazard areas, as well as the delineation of regional scope.
Explosive gases should be classified based on their Maximum Experimental Safe Gap (MESG) or Minimum Ignition Current Ratio (MICR), and grouped by their ignition temperature. Combustible dusts can be divided into conductive and non-conductive types based on their electrical conductivity, and grouped by their low ignition temperature. Hazardous areas with explosive risks are categorized into two types: gas explosion hazardous areas and dust explosion hazardous areas. These areas are further divided into three zones (0, 1, and 2) based on the frequency and duration of the presence of explosive gas environments. Hazardous areas with combustible dust/air mixtures are categorized into three zones (20, 21, and 22) based on the frequency and duration of their occurrence and the thickness of the dust layer.
Section II: Selection of Explosion-Proof Electrical Equipment for Hazardous Areas with Explosion Risk.
The selection principle for explosion-proof electrical equipment is safety and reliability, as well as economic rationality. It should be selected based on the level of the explosion hazard area and the type, grade, and group of the explosive hazard substances. Refer to the specific selection table in standard AQ3009-2007 for details.
Section 3: Installation of electrical lines and explosion-proof electrical equipment in hazardous explosive areas.
Installation methods for electrical wiring in explosive gas environments can be divided into cable wiring and conduit wiring methods. Electrical wiring should be laid in areas with lower explosion hazards or at a greater distance from the source of release, avoiding places prone to mechanical damage, vibration, corrosion, dust accumulation, and those with hazardous temperatures. If avoidance is not possible, preventive measures should be taken. The low-voltage cables or insulated conductors used must have a rated voltage higher than the operating voltage of the circuit and not less than 500V. Insulated conductors must be laid within conduits, etc. For more details, please refer to explosion-proof electrical installation, maintenance, and repair training courses.
Four: Inspection and maintenance of explosion-proof electrical equipment in hazardous areas.
To minimize the ignition hazard of electrical equipment in hazardous areas, initial inspections should be conducted before the equipment is put into operation and during the handover acceptance of the project. To ensure the electrical equipment remains in good condition for long-term use in hazardous areas, continuous supervision and regular inspections should be carried out. Initial and periodic inspections should be entrusted to safety production testing and inspection institutions with explosion-proof qualifications.
Inspections and maintenance of explosion-proof electrical equipment should be conducted by qualified personnel meeting specified criteria. These individuals must undergo training covering topics such as explosion-proof types, installation practices, relevant regulations and procedures, as well as the general principles of hazardous area classification. They should also receive appropriate continuing education or regular training and possess relevant experience and trained qualifications. Continuous supervision and periodic inspections should be implemented. Maintenance requirements should propose reasonable corrective measures and equipment replacement procedures.

Basic Explosion-Proof Design Standards for Hazardous Areas (Shared by Shenzhen ZhongNuo Testing Technology Co., Ltd.)
1. First, conduct an overall explosion protection design
2. Directed release of explosive energy. Around the explosion source, utilize both anti-explosion and venting technologies comprehensively. Set anti-explosion walls and windows in the direction of high population density, office areas, and critical equipment. In areas with low human traffic and no critical equipment, install venting walls and windows.
3. Establish safe distances. Minimize the placement of office areas, residential zones, and critical equipment areas within distances less than the safe margin, unless necessary; if set up, implement necessary explosion-proof measures.
4. Conversion of non-blast-resistant buildings to blast-resistant structures. Within the range of less than the safe distance, blast resistance assessment of the buildings should be conducted, and reinforcement for buildings that do not meet blast resistance requirements should be carried out: to prevent building collapse; to prevent the fracturing of brittle materials such as bricks, concrete, glass, etc., and the generation of flying debris.
5. Place explosion-proof shelters in hazardous blast areas.

Shenzhen ZhongNuo Inspection & Testing Technology Co., Ltd. offers explosion-proof construction service in the field of:
Explosive gas environments and hazardous areas with explosive or flammable dust exist in various industries and fields, including petrochemicals, metal smelting, fine chemicals, petrochemical ground facilities (such as gas stations, refueling stations, and petrochemical storage and transportation), new energy, special equipment, nuclear power, tunnels, grain processing, wood processing, metal component manufacturing, environmental protection engineering, and more. Ensuring explosion-proof safety in these hazardous areas is crucial for safeguarding the economic development of our country and the nation.

Basic Knowledge and Requirements for Cable Use in Explosion-Proof Construction Sites (Shared by Shenzhen ZhongNuo Inspection Technology Co., Ltd.)
Installation methods for electrical wiring in explosive gas environments can be categorized into cable wiring and conduit wiring methods.
Note: The installation of inherently safe circuits does not have to comply with the provisions of this article.
7.1 General Provisions
7.2 Electrical wiring should be installed in areas with lower explosion hazards or at a greater distance from the source of release, avoiding locations prone to mechanical damage, vibration, corrosion, dust accumulation, and those with hazardous temperatures. When avoidance is not possible, preventive measures should be taken.
7.3 The selected low-voltage cables or insulated conductors must have a rated voltage higher than the working voltage of the line and not less than 500V. Insulated conductors must be laid within conduits.
7.4 Prohibition of overhead lines at 10kV and below crossing explosive gas environments; the horizontal distance between overhead lines and explosive gas environments should not be less than 1.1 times the height of the pole tower.
7.5 Cables and their accessories shall be installed in such a position that, in view of the actual conditions, they are protected against external mechanical damage, corrosion, or chemical influences (such as the effects of solvents), as well as the effects of high temperatures (also see 6.1.2.4.4 for this safety circuit). If such conditions cannot be avoided, protective measures shall be taken during installation, such as using conduits or selecting the cable type (armored cables, shielded wires, seamless aluminum sheathed cables, mineral insulated metal sheathed cables, or semi-rigid sheathed cables, etc., to minimize damage).
7.6 Single-core wire without sheath should not be used for conductive wiring unless installed within a distribution board, enclosure, or conduit system.
Explosion-proof electrical modifications and on-site explosion-proof construction consulting services for hazardous areas — Shenzhen ZhongNuo Testing Technology Co., Ltd.