Shenzhen ZhongNuo Testing Technology Co., Ltd. is based in South China and offers on-site explosion-proof construction, safety inspections, renovations, project acceptance, and explosion-proof installation consulting services. We are well-versed in explosion-proof construction standards, boasting experienced construction teams and extensive practical experience. We have served major corporations such as PetroChina, LG, Hanlan Environment, BOE Technology Group, and Sinovac Biotech, receiving consistent praise and trust from our clients!
In recent years, with the continuous development of society and the frequent occurrence of safety accidents, people's awareness of safety production has been increasing, and the governance of potential hazards in hazardous environments is urgent.
In various industrial sectors in our country, such as oil, chemicals, ports, coal, and others, there is often a risk of leaks or spills of flammable and explosive gases, liquids, dust, and fibers during production, processing, transportation, and storage. When these substances mix with air, they can form explosive mixtures. If the concentration of the mixture reaches the explosive range, any ignition source can trigger an explosion and lead to severe accidents, including fires and even chain reactions resulting in major incidents. Therefore, equipment used in such hazardous environments must be certified by an institution as explosion-proof products. The use of all equipment in explosion-proof environments must be installed and debugged by experienced engineering companies in strict accordance with the specifications and acceptance standards for explosion-proof construction before being put into actual production use. This ensures the maximum safety requirements for all stages of the production process.

Basic Knowledge and Requirements for防爆 Construction Site Cable Use (Shared by Shenzhen ZhongNuo Testing 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 hazard 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 operating voltage of the circuit and not less than 500V. Insulated conductors must be laid inside conduits.
7.4 No overhead lines rated 10kV and below are permitted to cross explosive gas environments; the horizontal distance between the overhead lines and the explosive gas environment should not be less than 1.1 times the height of the poles.
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 cable types (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.

In the design of industrial factory buildings, different production processes have varying requirements for the structures. Production facilities for precision instruments and equipment necessitate stable temperatures, humidity, and cleanliness; while workshops with heat or dust require adequate ventilation and dust removal systems. For industrial enterprises such as chemical, pharmaceutical, and petrochemical industries, due to the risk of explosion during production, it is crucial to consider explosion prevention measures in the design process, in addition to meeting production requirements. In the event of an explosion, efforts should be made to minimize the loss of life and property. Shenzhen Zhongnuo Testing Technology Co., Ltd. shares its views on the design of buildings for explosive areas and electrical wiring, for your reference only.
Basic technical measures for explosion-proof in factory building design
(1) For factories (such as plants) where the entire site poses an explosive hazard, the overall planning and design should consider factors like the production processes, product types, production characteristics, and danger levels of hazardous materials within the buildings. After determining the danger level of the buildings, zoning plans should be made. The distances between buildings within the hazardous material production area and surrounding villages, highways, railways, towns, and the factory's living facilities should be calculated based on the building's danger level and the amount of stored hazardous materials, and the larger value should be chosen in accordance with the standards. If the required distances cannot be met due to site limitations, protective barriers must be constructed, such as levees or reinforced concrete walls. Protective barriers must be installed for Grade A buildings. The layout should be tailored to the actual conditions, making the best use of the terrain and地貌 for optimal and reasonable arrangement.
(2) For factory buildings and workshops within a general industrial area that produce and use products, it is advisable to cluster them in the same region as much as possible. The distance from these buildings and workshops to general factory buildings and workshops should meet safety distance requirements, which facilitates unified treatment of fire-resistant walls and other explosion-proof architectural structures.
(3) Workshops with explosive hazards should be located in single-story buildings. If the building is multi-story due to process requirements, they should be situated on the upper floor.
(4) When local explosion-proof rooms are installed in general factory buildings or workshops, the room should be as close to the exterior wall as possible. Use specially designed windows that are easy to open outward, which makes it easier to address the venting area and facilitates firefighting.
(5) In the factory building, workshops with high and low hazards should be separated by sturdy fire-resistant walls (brick or reinforced concrete walls). It is advisable to open doors on the exterior walls for inter-workshop communication using external corridors or balconies; or create double-door vestibules in the fire-resistant walls, attempting to stagger the doors as much as possible. Use the vestibules to mitigate the impact of the explosion shockwave and reduce the scope of the explosion's effects.
(6) For equipment prone to explosion, it should be placed as close to the exterior wall or windows as possible, or outdoors, to minimize its destructive force.
(7) Production and storage of hazardous materials of different nature should be separated, such as those that must be kept apart from oxygen.
(8) Do not locate the hazardous explosive areas in basements or semi-basements due to poor ventilation, which can cause significant impact during accidents and is不利于 evacuation and rescue efforts.

As the world's energy and chemical industries develop, construction in explosive hazard environments is becoming increasingly widespread, making prevention and acceptance of such environments even more critical.
Especially in flammable dust environments, such as plastic factories, feed/food/cereal processing plants, metal polishing and finishing workshops, and paper-making/forestry wood powder/fiber dust factories, the demand for explosion-proof installation, design, and renovation projects is also increasing.
Whether it's large-scale explosion-proof or local explosion-proof, if there are hidden dangers in product quality or installation/renovation quality,
Our personal and property safety is at great risk, so we must maintain strict quality control over every process to ensure the reliability and safety of explosion-proof installations and renovations.
Shenzhen ZhongNuo Inspection Technology Co., Ltd. offers explosion-proof construction and retrofitting consulting services, boasts extensive qualifications and case studies, absolutely worth it!
Explosion-proof electrical retrofitting for hazardous areas and on-site explosion-proof construction consulting services - Shenzhen Zhongnuo Testing Technology Co., Ltd.