Yunfu Explosion-proof Project Acceptance Standards, Shenzhen ZhongNuo Inspection

Shenzhen ZhongNuo Inspection & Technology Co., Ltd. is based in South China, offering services such as on-site explosion-proof construction, safety inspections, renovations, project acceptance, and explosion-proof installation. We are well-versed in explosion-proof construction standards and boast experienced construction teams. We have served major corporations like PetroChina, LG, Hanlan Environment, BOE, and Sinovac Biotech, receiving consistent praise and trust from our clients!
Basic knowledge for explosion-proof electrical installation includes the following points:
I. Classification, grouping of explosive substances, and classification, grouping, and delineation of explosive hazard areas.
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, classified by their conductivity, can be divided into conductive and non-conductive types, and grouped by their low ignition temperature. Hazardous areas involving explosive substances are categorized into two types: gas explosion hazardous areas and dust explosion hazardous areas. These areas are further divided into three zones based on the frequency and duration of explosive gas environments: Zone 0, Zone 1, and Zone 2. Hazardous areas involving combustible dust/air mixtures, based on the frequency and duration of their occurrence and dust layer thickness, are categorized into three zones: Zone 20, Zone 21, and Zone 22.
Section 2: Selection of Explosion-Proof Electrical Equipment for Hazardous Areas.
Selection principles for explosion-proof electrical equipment are safety and reliability, economic and reasonable. They should be selected according to the grade of the explosion hazard area and the category, level, and group of the explosive hazardous 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 locations prone to mechanical damage, vibration, corrosion, dust accumulation, and areas with dangerous temperatures. If avoidance is not possible, preventive measures must 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 installed within conduits. For more detailed information, please refer to training courses on explosion-proof electrical installation, maintenance, and repair.
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, during the handover and acceptance of the project completion. To ensure that the electrical equipment remains in good condition and can be used safely in hazardous areas for a long period, continuous supervision and regular inspections should be conducted. The initial and regular inspections should be entrusted to safety production inspection and testing institutions with explosion-proof qualifications.
Inspections and maintenance of explosion-proof electrical equipment should be conducted by qualified personnel meeting specified requirements. These individuals must undergo training that includes the general principles of explosion-proof types, installation practices, relevant regulations and procedures, and classification of hazardous areas. They should also receive appropriate continuing education or regular training, and possess relevant experience and trained qualifications. Continuous supervision and periodic inspections should be conducted. Maintenance requirements should propose reasonable corrective actions and equipment replacement measures.

Basic防爆Design Standards for Explosive Hazardous Locations (Shared by Shenzhen ZhongNuo Inspection Technology Co., Ltd.)
1. First, conduct the overall explosion protection design
2. Directed release of explosive energy. Around the explosion source, comprehensively utilize anti-explosion and venting techniques. 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. Determine the safe distance. Minimize the establishment of office areas, residential zones, and critical equipment areas within the safe distance range unless necessary; if established, implement necessary explosion-proof measures.
4. Conversion of non-explosion-proof buildings to explosion-proof. Within the range of less than the safe distance, conduct explosion-proof assessment of the buildings and reinforce those not meeting explosion-proof requirements: prevent building collapse; prevent the bursting and shattering of brittle materials such as bricks, concrete, glass, etc., to avoid debris.
5. Place explosion-proof shelters in hazardous blast areas.

Shenzhen Zhongnuo Inspection Technology Co., Ltd. offers explosion-proof engineering construction services in the field of:
Explosive gas environments and hazardous areas with explosive or flammable dust are present in numerous industries and fields, including petrochemicals, metal smelting, fine chemicals, petrochemical ground facilities (gas stations, filling stations, petrochemical storage and transportation), new energy, special equipment, nuclear power, tunnels, grain processing, wood processing, metal component manufacturing, environmental protection engineering, and more. Ensuring the explosion-proof safety of these dangerous areas safeguards our and the national economy's development.

Basic Knowledge and Requirements for防爆 Cable Use at Construction Sites (Shared by Shenzhen Zhongnuo Testing Technology Co., Ltd.)
Installation methods for electrical wiring in explosive gas environments can be divided into cable wiring and conduit wiring methods.
Note: The installation of intrinsic safety circuits is not required 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. If 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 operating voltage of the line and not less than 500V. Insulated conductors must be installed within conduits.
7.4 No overhead lines with voltage of 10kV or below are permitted to cross 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 towers.
7.5 Cable and its accessories should be installed in a location that, in accordance with actual conditions, prevents them from being damaged by external mechanical forces, corrosion, or chemical influences (such as the effects of solvents), as well as from the effects of high temperatures (see also 6.1.2.4.4 for this safety circuit). If these conditions cannot be avoided, protective measures should 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 Unsheathed single-core wires should not be used for conductive wiring unless they are installed within a distribution board, enclosure, or conduit system.
Explosion-proof electrical transformation in hazardous areas and on-site explosion-proof construction consulting services - Shenzhen Zhongnuo Inspection Technology Co., Ltd.