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The new version of GB/T3836 series standards has been officially implemented on May 1, 2022. The difference between the old and new standards is a concern for many corporate clients, and the explosion-proof mark serves as the product's "ID card",It can enable users and installers to quickly understand the explosion-proof productExplosion proof typeCorresponding gas/dust and temperature groups. In order to avoid the installation of gas explosion-proof products in dusty areas, and the installation of "n" type products in the explosion-proof area of Zone 1. Ensure that explosion-proof products are compatible with hazardous areas in terms of selection.

Based on the introduction in the new version of GB/T 3836-2021 standard, Zhongnuo Testing summarizes the content and meaning of the explosion-proof mark for Ex equipment used in combustible dust environments.

The explosion-proof mark for Ex equipment used in combustible dust environments should include:
1、 The symbol Ex indicates that the Ex equipment complies with one or more explosion-proof types listed in Chapter 1 of GB/T 3836.1-2021's specialized standards.
2、 Explosion proof protection type,The explosion-proof protection measures, explosion-proof protection types, and corresponding code relationships adopted by the equipment are shown in the table below.

Note: In addition to the four explosion-proof protection types listed above, there are also radiation explosion-proof types and special explosion-proof types when using Ex equipment for combustible dust. Due to the scarcity of such products, we will not elaborate further here.

3、 Types of combustible dust
III A、IIIB andIIIClass C: Other combustible dust except for coal mine gas environment, as shown in the table below.

Note: Under the same conditions, IIIC＞IIIB＞IIIA

4、 Temperature group refers to the temperature limit at which the ignition temperature of a combustible dust mixture can be ignited.

5、 Applicable Equipment Protection Level (EPL)
The relationship between different equipment protection levels and explosion-proof areas is shown in the table below.

remarks:
1 Da/Db/DC is the Ex equipment protection level for combustible dust environments other than coal mine gas environments
2. Under the same conditions,Da>Db>Dc
3. The Ex logo should be marked in the order given in the above columns, with small intervals between them.

Example of Explosion proof Signs:
Ex tb IIIC T130°C Db
Ex： Electrical equipment labeling for combustible dust environments
tb： The protection type is anti dust ignition shell type
IIICConductive dust environment

T130 ° C: The maximum surface temperature of the equipment shall not exceed 130 ° C
Db： Equipment protection level, can be used in zones 21 and 22

Ex ia IIIB T₂₀₀80°C Da
Ex：Electrical equipment labeling for combustible dust environments
iaThe protection type is intrinsic safety type
IIIB：Non conductive combustible dust environment
T ₂₀₀80°C：The maximum surface temperature of the equipment under the condition of 200mm dust cloud shall not exceed 80 ° C
Da： Equipment protection level, can be used in zones 20, 21, and 22


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