As an electrical product, LED lamp holders are naturally inseparable from the two indexes of insulation resistance and electric strength. If the relevant index requirements are not met, some problems will inevitably occur when the product is used. So, what are the requirements for the insulation resistance and electrical strength of the LED lamp holder? Let's take a look at the introduction given below.
From the perspective of electrical classification, the LED lamp holder belongs to the II type of anti-shock type, which requires the input of the LED lamp holder to between the accessible parts and the input to the surface of the device to meet the insulation resistance and electrical strength requirements of the reinforced insulation level. Nowadays, many LED lamp holders can pass through 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 device orientation of the aluminum substrate of the LED module.
Many companies choose to use non-blocking transformers for 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 terminals of the built-in power supply. At the same time, because the aluminum substrate of the LED module directly touches the metal shell during the installation, the insulation level between the input terminal and the accessible parts cannot meet the electrical strength 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 casing, use an insulating material casing. However, if an insulating material shell is used, it is also necessary to consider the aforementioned problem that screws with a diameter of less than 3mm need to be screwed into metal.