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 a wealth of 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!
Shenzhen ZhongNuo Testing Technology Co., Ltd. offers explosion-proof engineering construction services for hazardous explosive areas.
1. Explosion-proof site inspection and consultation
2. Explosion-proof engineering site construction and renovation
3. Explosion-proof construction acceptance
4. Explosion-proof electrical installation, maintenance, and renovation
5. Explosion relief, explosion-proof walls, doors, and windows installation
6. Dust Removal Equipment Installation and Renovation Construction

Shenzhen Zhongnuo Inspection Technology Co., Ltd. offers explosion-proof construction services 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 (gasoline stations, gas 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 explosion-proof safety in these dangerous areas safeguards the防爆 safety of hazardous explosive sites, protecting the economic development of our country and the nation.

Basic Safety Rules for Explosion-Proof Electrical Construction (Shared by Shenzhen Zhongnuo Testing Technology Co., Ltd.)
Explosion-proof electrical installation differs from standard electrical installation due to the increased explosion-proof requirements of its environment. In accordance with industry standards, an explosive environment is defined as one where a mixture of gas, vapor, mist, or dust with air can ignite, causing combustion to spread to the entire unburned mixture. An area where a large number of explosive gas environments or flammable dust environments are present or expected to be present, necessitating special preventive measures for the structure, installation, and use of electrical equipment, is called a hazardous area. Explosion-proof electrical installation refers to a task that meets the explosion-proof electrical, conditions, and personnel requirements, involving work in explosive environments and hazardous areas, and is highly critical.

Basic knowledge for explosion-proof electrical installation includes the following points:
Division, grouping, and classification of explosive materials, as well as the classification, grouping, and delineation of explosion hazard areas.
Explosive gases should be classified based on their Maximum Experimental Safe Gap (MESG) or Minimum Ignition Current Ratio (MICR), and grouped according to their ignition temperature. Combustible dusts can be divided into conductive and non-conductive types based on their electrical conductivity, and grouped according to their low ignition temperature. Hazardous areas with explosion risks are categorized into two types: gas explosion hazard areas and dust explosion hazard areas, based on the physical state of the explosive substances. Hazardous areas are classified 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 2: Selection of Explosion-Proof Electrical Equipment for Hazardous Areas.
The selection principle for explosion-proof electrical equipment is safety and reliability, economic and reasonable. It should be selected based on the grade of the explosive hazard area and the category, level, and group of explosive hazardous substances. Refer to the specific selection table in standard AQ3009-2007.
Section 3: Installation of electrical circuits 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 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. The low-voltage cables or insulated conductors used must have a rated voltage higher than the working voltage of the circuit and not less than 500V. Insulated conductors must be installed within conduits. For more details, please attend training courses on explosion-proof electrical installation, maintenance, and repair.
IV. 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 after construction is completed. For the electrical equipment to remain in good condition and be used in hazardous areas for an extended period, continuous supervision and regular inspections are necessary. Both initial and regular 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 conducted. Maintenance requirements should include reasonable remedial measures and equipment replacement procedures.
Explosion-proof electrical transformation for hazardous areas and on-site explosion-proof construction consulting services - Shenzhen Zhongnuo Inspection Technology Co., Ltd.