What are the requirements for the nameplate markings of Ex components?

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What are the requirements for the nameplate markings of Ex components? Regarding the labeling requirements for explosion-proof electrical components (Ex components), there are three different scenarios depending on the size of the components; here, Zhongpeng will provide a brief overview for everyone ； https://p3-sign.toutiaoimg.com/tos-cn-i-6w9my0ksvp/c83b28c1a92540f387187d0e6e856c6a~tplv-tt-origin-web:gif.jpeg?_iz=58558&from=article.pc_detail&lk3s=953192f4&x-expires=1767258895&x-signature=0aHL0FkeWWwy%2B%2FBdH44Wv2mMjFE%3D I. Ex components of normal size: Such components must have the following information clearly marked on their surface, without exception: the name or brand logo of the manufacturer; the product model designated by the manufacturer; the special mark indicating explosion protection, i.e., “Ex” (which indicates that it is an explosion-proof product); symbols for each type of explosion protection technology used in the product (for example, “d” for flameproof design and “i” for intrinsically safe design; as many symbols as there are different technologies should be included); the category symbol for the Ex component (corresponding to different explosive environments); the name/logo of the testing institution that issued the explosion protection certification, along with the certification number (to prove that the product meets explosion protection requirements); a single letter “U” (note: “X” should not be used); information required according to the additional standards specific to each explosion protection type as specified in national standard GB/T 3836.1-2021 (if required by the manufacturing standards); as much information as possible should be indicated —— other marks mentioned in Articles 29.4 and 29.5 of national standard GB/T 3836.1-2021. https://p3-sign.toutiaoimg.com/tos-cn-i-6w9my0ksvp/d1d5949f24b741df92230498dcecf36c~tplv-tt-origin-web:gif.jpeg?_iz=58558&from=article.pc_detail&lk3s=953192f4&x-expires=1767258895&x-signature=TEaa%2BPr7RcuXJ4nVrC0WeWfIPk0%3D II. For small Ex components, due to their compact size and limited space for printing text, it is acceptable to include fewer details; however, at least the following 5 items must be indicated: the manufacturer’s name or brand logo, the product model (if the specific model is already stated on the explosion-proof certification, it can be abbreviated or omitted here), the name/logo of the testing institution that issued the certification along with the certification number, the letter U (which is required only for explosion-proof components), and as many other symbols as possible as specified in clauses 29.4 and 29.5 of standard GB/T 3836.1-2021. III. For ultra-small Ex components, if there is no space at all for printing any text, then it is not necessary to include any markings on the component itself. These symbols can be printed on a separate label, which can then be attached next to the component ； The content of this sign must comply with the provisions of clauses 29.3, 29.4, and 29.5 of the national standard GB/T 3836.1-2021, and it must be installed in a prominent location on the installation site.