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 have experienced construction teams. We have served large corporations like China Petroleum, LG, Huanlan Environment, BOE Technology Group, and KeXing Biotechnology, earning consistent praise and trust from our clients!
Equipment grounding in explosive environments shall comply with the following regulations (shared by Shenzhen ZhongNuo Testing Technology Co., Ltd.)
In accordance with the relevant provisions of the current standard "Code for Grounding Design of AC Electrical Installations" GB/T50065, the following parts that do not require grounding should still be grounded in explosive environments:
1) Non-electrically conducting surfaces: metal enclosures of equipment with an AC rated voltage below 1000V and a DC rated voltage below 1500V, which are normally not live.
2) In dry conditions, equipment with alternating voltage ratings of 127V or less and direct voltage ratings of 110V or less typically has metal enclosures that are not charged.
3) Equipment installed on a grounded metal structure.
(2) In explosive hazardous environments, the exposed, conductive parts of equipment should be reliably grounded. All equipment within Zones 1, 20, and 21 of explosive environments, as well as other equipment within Zones 2 and 22 except for lighting fixtures, should use a dedicated grounding wire. If this grounding wire is installed in the same protective conduit as the phase wire, it must have insulation equal to that of the phase wire. Lighting fixtures within Zones 2 and 22 of explosive environments can use a metal piping system with a reliable electrical connection as a grounding wire, but not a pipeline for conveying substances.
(3) In different directions on the slope of the explosive hazard area, the grounding main should be connected to the grounding body at least twice.

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 where gases, vapors, thin fogs, or dusts mix with air under atmospheric conditions, and upon ignition, the flame can spread to the entire unburned mixture, is termed an explosive environment. An area where a large or expected quantity of explosive gas or flammable dust environments is present, necessitating special preventive measures for the structure, installation, and use of electrical equipment, is called a hazardous area. Explosion-proof electrical construction refers to a task that meets the requirements for explosion-proof electricals, conditions, and personnel, involving work in explosive environments and hazardous areas, and is highly critical.

Standard for Explosion-proof Construction Acceptance - Shenzhen ZhongNuo Testing Technology Co., Ltd.
G50058 Specification for Design of 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-Proof Safety Code for Hazardous Areas
GB/T3836.1 "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 Installations in Explosive and Flammable Gas Environment"
14J938 "Explosion-Proof and Explosion Ventilation Doors, Windows, and Roof and Wall Construction"

Basic Knowledge and Requirements for Cable Use in Explosive Construction Sites (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 line and not less than 500V. Insulated conductors must be installed within conduits.
7.4 It is strictly prohibited to cross explosive gas environments with overhead lines of 10kV and below; the horizontal distance between the overhead lines and the explosive gas environment should not be less than 1.1 times the height of the tower.
7.5 Cable and its accessories should be installed in a position that prevents damage from external mechanical forces, corrosion, or chemical influences (such as the effect 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 should be taken during installation, such as using conduits or selecting cable types (armored cables, shielded wires, seamless aluminum sheathed wires, mineral insulated metal sheathed cables, or semi-rigid sheathed cables, etc.) to minimize damage.
7.6裸单芯电线, unless installed within a distribution board, housing, or conduit system, should not be used for conductive wiring.
explosion-proof electrical modifications for hazardous areas and site-based explosion-proof construction consulting services - Shenzhen ZhongNuo Inspection Technology Co., Ltd.