How can a led tube pass UL certification?
1. Requirements for fire rating: The power module and LED are enclosed by the tubular transparent polymer shell of the fluorescent lamp. The transparent polymer shell plays the role of fire prevention and electric shock prevention in the product. According to standard requirements, the material of the fluorescent lamp housing must be above V-1 level, so the transparent polymer housing must be made of material above V1 level. It should be noted that the product shell must reach the required V-1 level, and its thickness must be greater than or equal to the thickness required by the V-1 level of the raw material. The fire rating and thickness requirements can be found on the UL yellow card of the raw material.
2. Drop test: According to the requirements of the product standard, a drop test should be performed to simulate the drop that may occur during actual use. After the product falls from a height of 0.91m onto a hardwood board, the outer shell cannot be broken or even expose the dangerous live parts inside.
3. Dielectric strength: the transparent casing encloses the power module inside, and the transparent casing material must meet the requirement of electric strength. According to the requirements of the standard, based on the 120V operating voltage in the United States, the internal high-voltage live parts and the shell (covered with metal foil for testing) must be able to withstand the AC 1240V electrical strength test.
4. Power module output voltage: The power module is an important part of the LED fluorescent lamp, and the power module mainly adopts switching power supply technology. According to the different types of power modules, different standards can be considered for testing and certification. If the power module is a class II power supply, UL 1310 can be used for testing and certification. A class II power supply refers to a power supply that uses an isolation transformer, the output voltage is less than 60V DC, and the current is less than 150/‰. For non-class II power supplies. UL 1012 is used for testing and certification. The technical requirements of these two standards are very similar and can be referred to each other. Most of the internal power supply modules of LED lights use non-isolated power supply, and the output DC voltage of the power supply is also greater than 60V, so it is not suitable for UL 1310 standard, but suitable for UL 1012 standard.
