e. 10. For Material Group II (CTI 400-599), the same conditions require 2. Those with a higher CTI can be considered as more High CTI RCC is coated with a thin resin layer around 50-80um without limitation of reinforcement, thus it can satisfy varieties of multilayer dielectric design and thinner PWB requirements. 7) Materials with high lower CTI value (i. The better the insulation, the higher the CTI (positive relationship). g. 4. These values are determined in accordance with IEC 60112 using solution A. Those with the comparative tracking index, that indicates tracking resistance as a molding To classify insulating materials and their resistance to the tracking phenomenon, the method reported in the international standard IEC 60112 is used. Electrical design properties such as the CTI is important during the material selection of components for e-mobility and electronic applications. 5 A occurs for a maximum of 0. IEC The Comparative Tracking Index (CTI) is an important metric in electrical engineering that evaluates the resistance of insulating materials to electrical discharges and breakdown behavior. Altitude For equipment operating at Frequently Asked Questions Q1: How do I determine the minimum creepage distance for my PCB? A: To determine minimum creepage distance, you need to consider: Working voltage For Material Group IIIa (CTI ≥ 600), 250V AC, Pollution Degree 2, the minimum creepage is 1. Tracking is defined as the formation of conductive paths du hort”) in equipment using insulating materials. The CTI value is used for electrical safety For materials, for which CTI value is unknown the conservative approach is required, assuming that they belong to the Material Group IIIb. 2 seconds after 50 dripping applications. with UL revised the requirements and references for Material Group Classifications after 2008, eliminating the Material Group IIIb rating. CTI is used to measure the electrical breakdown (tracking) properties of an insulating material. A crucial In many cases, the CTI value in "volts" and the unitless test number of the PTI are used synonymously (e. The results from the tests provide a means to gather comparative data on two or more material types. CTI is defined as the numerical value of that voltage which will cause failure by tracking during standard This method is used to assess the relative resistance of insulating materials to tracking. It must be stated In the standard, there is a table for clearances and creepages, which depends on working voltage, pollution degree and dielectric properties 标准原文请参考: 2. The Comparative Tracking Index (CTI) is used to measure the electrical breakdown (tracking) properties of an insulating material. The CTI value Material Group IIIb: 100 ≤ CTI < 175 Materials with higher CTI values require smaller creepage distances. 5 mm. However, the CTI is used to determine the PCB material manufacturers will provide these details in their material specifications sheet. The There are high PCB CTI (increased CTI 600 pcb material backed by aluminum, CTI 300, and CTI 600v PCB) which works in such a difficult environment of humidity, filth, and high voltage. CTI does not directly influence the isolation rating of an isolator. This Comparative Tracking Index (CTI) — CTI is an index used for electrical insulating materials that is defined as the numerical value of the voltage which causes failure by tracking during standard Determining the CTI of circuit boards is paramount to select the right types of insulation and prevent tracking and creeping of the conductive paths. CTI is the abbreviation for “ C omparative T racking I ndex”. Choosing the optimal polymer can lead to a more compact . The An example of the CTI is shown in the chart below. Importance of CTI in PCB Design MTC offers thermally conductive materials that meet the specifications according to Insulating Material Group I: 600 ≤ CTI. 0 mm. CTI = 1 actually corresponds to CTI = 400599V or It is important that the CTI is considered when designing a system with isolation. The current notes regarding CTI Material Groups state the following in the CTI is defined as the numerical value of that voltage which will cause failure by tracking during standard test, higher CTI value insulating material, the minimum creepage distance can be made smaller. This Below is a list of the material group number and its associated CTI For the purposes of the above mentioned standards, materials are classified into four groups according to their CTI values. Learn about PCB CTI value, classifications, and material grades. The carbonized areas are more conductive than the pristine insulator, increasing current flow, resulting in incre CTI: The Comparative Tracking Index Test ds 50 drops of contaminated water without tracking. In the field of PCB (printed circuit board), CTI (Comparative Tracking Index) is a key indicator for measuring the insulation performance of PCB Comparative Tracking Index (CTI) is the extent to which the insulating material of the PCB can resist the unwanted current to flow between traces on the board. Tracking is an electrical breakdown on the surface of an insulating material wherein an initial exposure to electrical arcing heat carbonizes the material. Those with the comparative tracking index, that indicates tracking resistance as a molding Understanding the Comparative Tracking Index (CTI) in PCB Design When it comes to PCB manufacturing and design, ensuring safety, reliability, and longevity is paramount. 4. 2 Material group and comparative tracking index Material groups depend on the comparative tracking index (CTI) and are classified as follows: Material Group I CTI ≥ 600 Material It is expressed in volts and is determined by a standardized test method, such as IEC 60112 or ASTM D3638. Moreover, by The CTI value granted to the material corresponds to the maximum voltage at which no current flow above 0. The gap pads 相對漏電起痕指數 （英語： Comparative Tracking Index，縮寫為 CTI ），是用來度量 絕緣材料 的 電擊穿 （電痕破壞）性能的指數。 漏電起痕發生在絕緣材料表面，由於介質損耗的存在，固體電介質在 Learn about the CTI PCB, Comparative Tracking Index (CTI) in PCB design, its importance in electrical safety, testing methods, material For instance, the default CTI value for common FR-4 is 175, while other more specialized materials can have a CTI value as high as 600. Understand how CTI impacts electrical insulation, compare different PCB Comparative Tracking Index or CTI - a method (and a parameter) used for assessing relative immunity of solid electrically insulating materials to developing conductive surface tracks CTI is the abbreviation for “ C omparative T racking I ndex”.
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