Shenzhen ZhongNuo Inspection & Technology Co., Ltd. is based in South China and offers a range of explosion-proof technical consulting services, including on-site explosion-proof construction, safety inspections, renovations, project acceptance, and installation. We are well-versed in explosion-proof construction standards and boast experienced construction teams with extensive project experience. We have served major enterprises such as PetroChina, LG, Huanlan Environment, BOE, and Sinovac Biotech, receiving consistent praise and trust from our clients!
Basic Standards for Explosion-Proof Electrical Construction (Shared by Shenzhen ZhongNuo Inspection Technology Co., Ltd.)
Explosion-proof electrical construction differs from standard electrical construction 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, upon ignition, can spread to the entire unburned mixture. An area where a significant or anticipated presence of explosive gases or flammable dust requires special preventive measures for the structure, installation, and use of electrical equipment is called a hazardous area. Explosion-proof electrical construction refers to the work that meets the requirements of explosion-proof electrical, conditions, and personnel, and is carried out in explosive environments and hazardous areas, with strong intensity.

General Requirements for Explosion-Proof Workshop Design (Shared by Shenzhen ZhongNuo Inspection Technology Co., Ltd.)
4.1 Floor, Interior Wall
Areas producing flammable gases heavier than air, or vapors of flammable or combustible liquids, as well as Class B production workshops with dust or fiber explosion hazards, should use non-sparking floors. To prevent sparks, the floors can be made of rubber, plastic, rubber mixed with graphite, or asphalt concrete.
Walls in workshops where flammable dust may settle should be plastered or painted to create an easy-to-clean (washable) interior surface.
4.2 Office, Break Room
For personnel safety, do not establish offices or restrooms in Class A or B production buildings with explosion hazards. If necessary, such rooms can be located outside the workshop, separated from the workshop by non-combustible walls with fire resistance not less than 3.5 hours.
4.3 Electrical Equipment
Electrical equipment in explosion-proof workshops should be selected and installed according to different conditions, using explosion-proof types such as explosion-proof switches, explosion-proof motors, and explosion-proof lighting fixtures, and absolutely avoiding non-explosion-proof types.
4.4 Lightning Protection Equipment
In factories and workshops prone to explosions, in addition to installing lightning protection devices on the building itself, lightning rods should be installed around the building as required to ensure the entire structure is within the protection range of the lightning protection system, thereby preventing accidents caused by lightning strikes.

Explosive circuit protection shall comply with the following regulations (shared by Shenzhen ZhongNuo Testing Technology Co., Ltd.)
In the single-phase network within Area 1, both phase wires and neutral lines should be equipped with short-circuit protection, and appropriate switches should be used to simultaneously disconnect both phase wires and neutral lines.
(2) For 3kV-10kV cable lines, it is advisable to install zero-sequence current protection, with the protective devices in Zones 1 and 21 to operate for tripping.

Standard for Explosion-proof Construction Acceptance — Shenzhen ZhongNuo Inspection Technology Co., Ltd.
G50058 Design Specification for Electrical Installations in Explosive Hazardous Environments
GBJ54-83 "Code for Design of Low-Voltage Distribution Systems and Equipment"
G50016 Building Design Fire Prevention Code
AQ3009 Electrical Explosion Protection Safety Specification for Hazardous Locations
GB/T 3836.1 "Explosive Atmospheres – Part 1: Equipment – General Requirements"
GB/T3836.15 "Design, Selection, and Installation of Electrical Equipment for Explosive Atmospheres"
GB50257 "Code for Construction and Acceptance of Electrical Installation in Explosive and Flammable Gas Environment"
14J938 "Explosion-Proof and Explosion Ventilation Windows, Roofs, and Wall Construction"
Explosion-proof electrical retrofitting for hazardous areas and on-site explosion-proof construction consulting services - Shenzhen Zhongnuo Inspection Technology Co., Ltd.