As an electrical product, the insulation resistance and electrical strength of the LED lamp holder naturally have higher requirements. If it is not met, it is easy to cause some accidents. The following is a detailed introduction to this problem, let's learn it together.

From the perspective of electrical classification, LED lamp holders are classified as Class II anti-shock type, which requires that the input of LED lamp holders between the accessible parts and between the input to the exterior of the device needs to meet the requirements of the insulation resistance and electrical strength of the reinforced insulation level. Many LED lamp holders can pass the insulation resistance test, but the dielectric strength test fails, mainly due to the selection of the transformer with the built-in power supply and the orientation of the aluminum substrate of the LED module.

　　 Many companies choose to use non-blocking transformers for the purpose of cost saving or high power efficiency, which will lead to unsatisfactory requirements for the electrical strength of the reinforced insulation level between the input and output of the built-in power supply. At the same time, because the aluminum substrate of the LED module is in direct contact with the metal shell during installation, the insulation level between the input terminal and the accessible parts cannot meet the requirements of the reinforced insulation level.

　　To meet the requirements of the dielectric strength of the reinforced insulation level, you can choose to use a barrier transformer to electrically block the input and output of the built-in power supply, or instead of using a metal shell, use an insulating material shell. However, if an insulating material shell is used, it is also necessary to consider the aforementioned problem that screws with a diameter less than 3mm need to be screwed into metal.