Shenzhen ZhongNuo Inspection & Technology Co., Ltd. is based in South China and offers consulting services for explosion-proof construction, safety inspections, renovations, project acceptance, and explosion-proof installation. We are well-versed in explosion-proof construction standards, boasting experienced teams with extensive construction expertise. We have served major enterprises such as PetroChina, LG, Huanlan Environment, BOE Technology Group, and Sinovac Biotech, earning consistent praise and trust from our clients!
Basic Specifications for Explosion-Proof Electrical Construction (shared by Shenzhen ZhongNuo Testing Technology Co., Ltd.)
Explosion-proof electrical construction differs from standard electrical construction due to the increased explosion-proof requirements of its environment. Based on industry standards, an environment is considered explosive when a mixture of air with gases, vapors, mist, or dust is formed under atmospheric conditions and ignited, with the combustion spreading to the entire unburned mixture. An area where a large number or an expected large number of explosive gas environments or flammable dust environments are present, necessitating special preventive measures for the structure, installation, and use of electrical equipment, is termed a hazardous area. Explosion-proof electrical construction refers to a task that meets the requirements for explosion-proof electrical equipment, conditions, and personnel, and involves working in explosive environments and hazardous areas, emphasizing strength.

General Requirements for Explosion-Proof Workshop Design (Shared by Shenzhen Zhongnuo Testing Technology Co., Ltd.)
4.1 Floor, Interior Wall
Areas producing flammable gases heavier than air or vapors of flammable and combustible liquids, as well as Class B production workshops with dust and 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.
Interior walls of workshops where combustible dust may settle should be plastered or painted to create easily cleanable (wipeable) surfaces.
4.2 Office, Break Room
For personnel safety, offices or rest rooms should not be located in Class A or B production buildings with explosive hazards. If necessary, such rooms can be situated outside the workshop, separated from the workshop by non-combustible walls with fire resistance of not less than 3.5 hours.
4.3 Electrical Equipment
Electrical equipment in explosion-proof workshops should be selected and installed with explosion-proof types according to different conditions, such as explosion-proof switches, explosion-proof motors, explosion-proof lighting, etc., and non-explosion-proof types should be strictly avoided.
4.4 Lightning Protection Equipment
In facilities and workshops prone to explosion, in addition to installing lightning protection devices on the building itself, it is required to set up grounded lightning rods around the building. This ensures the structure is within the protection range of the entire lightning protection system, 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 and neutral lines should be equipped with short-circuit protection, and appropriate switches should be used to simultaneously disconnect both the phase and neutral lines.
(2) For 3kV-10kV cable lines, it is advisable to install zero-sequence current protection, and the protective devices in Zones 1 and 21 should be set to trip.

Standard for Explosion-proof Construction Acceptance — Shenzhen Zhongnuo Testing Technology Co., Ltd.
G50058 "Code for Design of Electrical Installations in Explosive Hazardous Environments"
GBJ54-83 "Code for Design of Low-Voltage Distribution Systems and Lines"
G50016 "Code for Fire Prevention in Building Design"
AQ3009 Electrical Explosion-Proof Safety Standard for Hazardous Locations
GB/T3836.1 "Explosive Atmospheres, Part 1: Equipment - General Requirements"
GB/T 3836.15 "Design, Selection, and Installation of Electrical Equipment for Explosive Atmospheres"
GB50257 "Code for Construction and Acceptance of Electrical Installations in Explosive and Fire Hazardous Environments"
14J938 "Explosion-Proof and Explosion Relief Windows, Doors, Roof, and Wall Construction"
Explosion-proof electrical retrofitting and on-site explosion-proof construction consulting services for hazardous areas — Shenzhen Zhongnuo Testing Technology Co., Ltd.