Shenzhen Zhongnuo Testing Technology Co., Ltd. is based in South China, offering explosion-proof construction on-site services, safety inspections, renovations, project acceptance, and installation. 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, Huanlan Environment, BOE Technology Group, and Sinovac Biotech, receiving consistent praise and trust from our clients!
Basic Requirements for Explosion-Proof Electrical Installations in Hazardous Areas (Shared by Shenzhen ZhongNuo Inspection Technology Co., Ltd.)
1. Oil-immersed equipment should be used under conditions of no vibration, no tilt, and fixed installation.
2. When using non-explosion-proof equipment for mechanical transmission in partition walls, the following regulations should be followed:
The room housing electrical equipment should be separated from the explosive hazard area by a solid wall made of non-combustible materials.
(2) Transmission shafts should be sealed at the wall partition with stuffing box seals or equivalent sealing measures.
(3) The exit of the electrical equipment room should lead to an environment free of explosive hazard areas.
(4) When the room where the equipment is installed must be connected to an explosive environment, the explosive environment should be maintained at a relative positive pressure.
3. Electrical lines and equipment in explosive environments, excluding inherently safe circuits, should be equipped with overload, short-circuit, and grounding protection. Electrical equipment that cannot overload can do without overload protection. Motors in explosive environments, in addition to the necessary protection required by current standards, should also be equipped with phase failure protection. If the automatic shutdown of electrical equipment could pose a greater danger than the ignition risk, an alarm device should be used in place of the automatic shutdown device.
4. In emergency situations, outside the hazardous area, measures should be taken at an appropriate location or site to disconnect the power to the equipment in the hazardous area. Continuous-running equipment should not be included in the emergency shutdown circuit and should be installed on a separate circuit to prevent the occurrence of additional hazards.
5. The design of transformer stations, distribution stations, and control rooms shall comply with the following regulations:
Transformer stations, distribution stations (including distribution rooms, etc.), and control rooms should be located outside of explosive atmosphere environments. When they are in positive pressure rooms, they can be arranged in Zones 1 and 2.
(2) For explosive gas atmospheres heavier than air, the equipment floor of electrical and instrumentation in power stations, sub-stations, and control rooms located in the additional 2 zone of the explosion hazard area should be elevated 0.6 meters above the external ground level.

In recent years, with the continuous development of society and the increasingly prominent safety accidents, people's awareness of safety production has been improving, and the treatment of hazards in dangerous environments is urgent.
In various industrial sectors in our country, such as oil, chemicals, ports, coal, and more, leaks or spills of flammable and explosive gases, liquids, dust, and fibers may occur during production, processing, transportation, and storage processes. 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 explosions and severe fires, potentially leading to catastrophic chain reactions. Therefore, all equipment used in such hazardous environments must be certified by authorized institutions as explosion-proof products. The use of all explosion-proof environment equipment requires installation and commissioning by experienced engineering companies, strictly adhering to the construction specifications and acceptance standards for explosion-proof projects, before being put into actual production use. This ensures the maximum safety requirements for all stages of the production process.

Selection of cables and wires for explosive environments shall comply with the following regulations: (Shared by Shenzhen Zhongnuo Testing Technology Co., Ltd.)
In explosive environments, the rated voltage of insulated conductors and cables used for low-voltage power and lighting circuits should be higher than or equal to the working voltage, and U0/U should not be less than the working voltage. The rated voltage of the neutral line should be equal to the phase line voltage and should be laid in the same sheath or protective tube.
(2) In areas where there is a risk of explosion, bare wires should not be used as supply and distribution lines, except within switchboards, junction boxes, or wiring systems using metal conduits.
(3) Copper-core cables should be used in Zone 1. In Zone 2, it is advisable to use copper-core cables, except for intrinsically safe circuits. When aluminum-core cables are used, their cross-sectional area must not be less than 16 square millimeters, and copper-aluminum transition joints should be used for connections to electrical equipment. Circuits installed in explosive dust environment Zones 20 and 21, as well as in areas with severe vibration within Zone 22, must use copper-core insulated conductors or cables.
(4) In addition to the circuit of this pressure safety system, the technical requirements for cable wiring in explosive environments shall comply with the specifications in Table 5.4.1-1.
(5) Technical requirements for pipeline wiring in explosive environments with voltages below 1000V, excluding circuits of intrinsic safety systems, shall comply with the specifications in Table 5.1.1-2.
(6) In explosive environments, the selection of insulated conductors and cable cross-sections, in addition to meeting the requirements of Table 5.4.1-1 and 5.4.1-2, shall also comply with the following regulations:
The conductor's allowable current-carrying capacity should not be less than 1.2 times the rated current of the fuse element and 1.2 times the setting current of the long-time delay overcurrent release of the circuit breaker, except for the situation specified in item 2 of this clause.
2) The long-term allowable current for the branch line of squirrel-cage induction motors with voltage below 1000V should not be less than 1.2 times the rated current of the motor.
(7) When installing overhead or bridge cabling, flame-retardant cables are recommended. Plastic sheathed cables without armor can be used when the installation method employs bridgeways that prevent mechanical damage. Non-armor cables can also be used in cable trenches within Zones 2 and 22, where there is no risk of damage from rodents or insects.

Shenzhen Zhongnuo Testing Technology Co., Ltd. offers explosion-proof construction service in the field of:
Explosive gas environments and hazardous areas with explosive or flammable dust in various industries and fields such as petrochemicals, metal smelting, fine chemicals, petrochemical ground facilities (gas stations, gas filling stations, petrochemical storage and transportation, etc.), new energy, special equipment, nuclear power, tunnels, grain processing, wood processing, metal parts manufacturing, environmental protection engineering, and more must ensure explosion-proof safety to safeguard the safety of dangerous explosive sites for both our and the national economy's development.
Explosion-proof electrical modifications and on-site explosion-proof construction consulting services for hazardous areas - Shenzhen ZhongNuo Inspection Technology Co., Ltd.