The so-called combustible dust environment refers to the environment where, under atmospheric conditions, a mixture of dust or fibrous combustible substances ignited with air will spread to all unburned mixtures. With the development of modern industrial technology, the number of hazardous areas with combustible dust is constantly increasing, and its harm has become inevitable. Corresponding dust explosion accidents also occur from time to time. On March 15, 1987, a large-scale flax dust explosion accident occurred at Harbin flax textile factory in China, causing huge casualties and property damage. Therefore, in the electrical design of this combustible dust environment, it is not only necessary to strictly follow national design standards and specifications, correctly select dust explosion-proof electrical equipment, but also to combine current technology and adopt new products for line arc protection. Among them, electrical fire protection current limiting protectors are more effective short circuit arc extinguishing products. Related standards and specifications: In the electrical design of combustible dust hazardous environments, national and industry standards that can be referenced include: (1) "Electrical Equipment for Combustible Dust Environments (Part 1): Electrical Equipment Protected by Enclosures and Restricted Surface Temperature" (GB 12476.1-2000), Section 1: Technical Requirements for Electrical Equipment. (2) Electrical Equipment for Combustible Dust Atmospheres (Part 2): Selection and Installation (GB 12476.2-2010). (3) Safety Regulations for Dust Explosion Protection (GB 15577-2007). (4) The safety production industry standard "Safety Code for Electrical Explosion Protection in Hazardous Areas" (AQ 3009-2007). (5) Design code "Code for Design of Electrical Installations in Explosive and Fire Hazardous Environments" (GB 50058-92)
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