UL94 and UL484:2007 are two different UL standards for testing and classifying the fire performance of electrical equipment.
1. UL94: UL94 is a test standard developed by the United States Safety Laboratory (UL) to evaluate the combustion characteristics of solid materials under flame contact. This standard divides materials into four grades of V-0, V-1, V-2 and HB, and judges the flame retardancy of materials according to their self-extinguishing properties, ignition delay time and burning speed. The V-0 rating is the highest, which means that the material self-extinguishes after the flame leaves, does not drip ignition, and has the shortest ignition delay time and burning speed.
2. UL484:2007: UL484 is the testing and classification standard for electrical equipment of the United States Safety Laboratory (UL). This standard specifies the flame retardant performance requirements of electrical equipment, including installation methods, combustion characteristics of materials, cable crossing methods, etc. UL484:2007 version refers to the standard released in 2007 to evaluate the flame retardancy and safety of electrical equipment.
Therefore, UL94 is a flame retardant performance test standard for solid materials, while UL484:2007 is a flame retardant performance and safety evaluation standard for electrical equipment. The focus and application objects of the two are different.