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I. What is the IP protection rating? The IP rating, also known as the enclosure protection rating, is an abbreviation for Ingress Protection. It denotes the level of protection provided by the enclosure of electrical equipment against the intrusion of foreign objects. This rating is based on the International Electrotechnical Commission standard IEC 60529; this standard was also adopted as a standard in the United States in 2004. Regarding the protection of electrical equipment enclosures against foreign objects, the IP rating is formatted as IPXX, where XX are two Arabic digits; the first X indicates the device’s dust protection level, with 6 being the highest value ； The second X indicates the water resistance level of the device; the highest value is generally 8. For the specific protection levels, refer to the table below (the higher the number, the greater the protection level). https://pic3.zhimg.com/80/v2-7830fe60ba4fe17fd96f13e7c25ff016_720w.jpg https://pic3.zhimg.com/80/v2-fb05da94d4fb9093faa6bcb73ac98c16_720w.jpg II. IP protection rating requirements for explosion-proof equipment used in areas with flammable dust 1. Intrinsically safe type iD (1) Generally speaking, since intrinsically safe equipment already incorporates measures within its circuitry, such devices do not require their enclosures to serve as a protective measure. However, since conductive components may compromise intrinsic safety performance, and any type of dust can reduce the reliable creepage distance, according to IEC61241-0:2004 requirements, the equipment enclosure must meet at least the IP6X protection level specified in GB4208-2008. (2) Equipment components that do not have an IP6X external protection rating can be considered to effectively prevent dust from entering if they are properly sealed, with a sealing thickness of no less than 1 mm. (3) In other cases, the required degree of enclosure protection for the equipment is determined by the specific operating conditions of the equipment. 2. Enclosure protection type tD (1): For Type A dust-tight equipment, various enclosures, including rotary motors, shall meet the IP6X requirements specified in GB4208. (2) The various enclosures of Type A dust-proof equipment, including rotary motors, shall meet the IP5X test and qualification requirements specified in GB4208. (3) For Type A dust-tight enclosures, the protection rating in Zones 20 and 21, as well as in Zone 22 with conductive dust, shall be no less than IP6X, and in Zone 22 it shall be no less than IP5X. 3. Encapsulated protection type mD and positive pressure protection type pD: Standard GB 12476 does not specify any requirements regarding the protection level for these devices. However, in actual certification testing, it is still necessary to determine the protection level based on the actual usage conditions and scenarios of the product. III. Supplementary Provisions 1. In accordance with GB/T4942.1-2005, the protection rating of the ventilation openings of the external fan in rotary motors should be at least as follows: IP20 at the air intake side, and IP10 at the air outlet side. 2. For plugs and sockets in Zones 21 and 22, where the rated current does not exceed 10 A and the rated voltage does not exceed 250 VAC or 69 VDC, such plugs and sockets need not meet the requirements of 12476.1.19.1 if they satisfy the following conditions simultaneously: 1) The socket is located on the power side. 2) There is an arc extinguishing delay time before the plug and socket are disconnected. 3) During arc extinguishment, the plug and socket comply with an IP6X dust-tight enclosure. 3. For lamps equipped with an interlock device that cuts off power when the cover is opened, in order to minimize the risk of explosion, the live components shall be protected by a housing with an internal protection rating of at least IP30, along with a warning label stating “Do not open while powered on”. Original article; any platform or individual is strictly prohibited from copying or reproducing it!