Regarding the explosion protection rating
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What does the explosion protection rating EX dIIBT4 mean? Could someone please explain it? Which manufacturers produce such controllers and switches?
This post was last edited by ZJYSSF on 2009-10-13 at 15:39. EX (explosion protection mark), d (flameproof enclosure), II (equipment category), B (gas class), T4 (equipment surface temperature class) – these are basically the most common explosion protection markings for products used in factories. There are quite a number of manufacturers in China that produce explosion-proof electrical equipment. . Almost all explosion-proof manufacturers can produce the grade you mentioned. The companies I commonly use include Huarong Group Co., Ltd.; there are many others as well, such as Shanghai Baolin. In earlier years, Shenyang produced a large number of explosion-proof products, but in recent years the market has been dominated by companies from the Jiangsu and Zhejiang regions.
Shanghai Huarong – I’ve heard of it; it seems like the products there are quite expensive.
EX explosion-proof mark, d flameproof type, Ⅱ B explosion protection class, T4 – maximum allowable surface temperature of the component: 100
The EX explosion-proof mark indicates a flameproof type, with an explosion protection rating of II B and a temperature group of T4. The type of explosion protection is specified in the \"Code for Design of Electrical Installations in Explosive and Fire-Hazardous Environments\", while the explosion protection rating and temperature category are provided in Appendix 3 of this code, along with example lists based on the hazardous properties of various substances.
The explanations for the fourth and fifth floors are supported; IIBT4 is clearly defined in Appendix 3 of the \"Code for Design of Electrical Installations in Explosive and Fire-Hazardous Environments,\" and D is also explained in said code.