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Key components and significance of explosion-proof certification

2025-12-15

Explosion proof mark (Ex) is a universal mark indicating that the equipment has passed explosion-proof certification and is suitable for environments where explosive gases may be present.
Explosion proof form
- (1) Explosion proof type (d): The equipment has a sturdy shell that can withstand internal explosion pressure and prevent internal explosions from spreading to the surrounding area, such as motors in chemical factories. Divided into da, db, and dc, corresponding to different device protection levels.
- (2) Increased safety type (e): Designed to reduce the possibility of ignition and used in safer explosive environments, such as some lighting fixtures.
- (3) Intrinsic safety type (i): prevents ignition by limiting circuit energy, suitable for more hazardous environments. Divided into IA, IB, and IC, IA can be used for Zone 0 (continuous presence of explosive gases).
- (4) Positive pressure type (p): Maintain positive pressure inside the equipment to prevent external explosive gases from entering, such as some large electrical installations.
- (5) Oil immersed type (o): Immerse the equipment in oil to prevent internal components from coming into contact with external explosive substances and causing ignition.
- (6) Encapsulation type (m): Encapsulate the equipment in resin to isolate potential ignition sources inside.
Equipment category
- (1) Class I: Used for underground (methane) gas equipment in coal mines.
- (2) Class II: Suitable for explosive gas environments other than underground coal mines, divided into IIA, IIB, and IIC. IIC can be used in IIA and IIB environments, with the highest level of danger.
- (3) Class III: Used in explosive dust environments other than coal mines, divided into IIIA (combustible fly ash), IIIB (non-conductive dust), and IIIC (conductive dust).
The temperature group (T1-T6) represents the highest temperature level that the surface of the equipment may reach during normal operation. T1 (maximum 450 ℃) - T6 (maximum 85 ℃), the higher the temperature group, the lower the allowed maximum surface temperature, and the safer it is in hazardous environments. It is necessary to ensure that the equipment temperature group is lower than the ignition temperature of surrounding explosive gases.
Equipment Protection Level (EPL)
- (1) Explosive Gas Environment: Ga ("very high" protection level, not an ignition source in normal, expected, or rare faults); Gb ("high" protection level, not the ignition source during normal and expected failures); Gc ("General" protection level, not the ignition source during normal operation).
- (2) Explosive dust environment: Da ("very high" protection level); Db ("high" protection level); Dc ("General" protection level).

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Key components and significance of explosion-proof certification

2025-12-15

Explosion proof mark (Ex) is a universal mark indicating that the equipment has passed explosion-proof certification and is suitable for environments where explosive gases may be present.
Explosion proof form
- (1) Explosion proof type (d): The equipment has a sturdy shell that can withstand internal explosion pressure and prevent internal explosions from spreading to the surrounding area, such as motors in chemical factories. Divided into da, db, and dc, corresponding to different device protection levels.
- (2) Increased safety type (e): Designed to reduce the possibility of ignition and used in safer explosive environments, such as some lighting fixtures.
- (3) Intrinsic safety type (i): prevents ignition by limiting circuit energy, suitable for more hazardous environments. Divided into IA, IB, and IC, IA can be used for Zone 0 (continuous presence of explosive gases).
- (4) Positive pressure type (p): Maintain positive pressure inside the equipment to prevent external explosive gases from entering, such as some large electrical installations.
- (5) Oil immersed type (o): Immerse the equipment in oil to prevent internal components from coming into contact with external explosive substances and causing ignition.
- (6) Encapsulation type (m): Encapsulate the equipment in resin to isolate potential ignition sources inside.
Equipment category
- (1) Class I: Used for underground (methane) gas equipment in coal mines.
- (2) Class II: Suitable for explosive gas environments other than underground coal mines, divided into IIA, IIB, and IIC. IIC can be used in IIA and IIB environments, with the highest level of danger.
- (3) Class III: Used in explosive dust environments other than coal mines, divided into IIIA (combustible fly ash), IIIB (non-conductive dust), and IIIC (conductive dust).
The temperature group (T1-T6) represents the highest temperature level that the surface of the equipment may reach during normal operation. T1 (maximum 450 ℃) - T6 (maximum 85 ℃), the higher the temperature group, the lower the allowed maximum surface temperature, and the safer it is in hazardous environments. It is necessary to ensure that the equipment temperature group is lower than the ignition temperature of surrounding explosive gases.
Equipment Protection Level (EPL)
- (1) Explosive Gas Environment: Ga ("very high" protection level, not an ignition source in normal, expected, or rare faults); Gb ("high" protection level, not the ignition source during normal and expected failures); Gc ("General" protection level, not the ignition source during normal operation).
- (2) Explosive dust environment: Da ("very high" protection level); Db ("high" protection level); Dc ("General" protection level).