Dielectric withstand voltage test is applied to low-voltage electrical apparatus, insulating material and insulation structure. The basic theory for withstand voltage test is to make a product exposed under extremely hostile environment, if the product can still regular works, that means the product can certainly keep working in normal condition. Different product has different specification, when do the withstand voltage test, a voltage higher than working voltage would be on the specimen and keep for a certain time, if the leakage current of the parts is in the normal range during the time, that means the parts is very safe when operate under the normal voltage, and reasonable design and good insulating material can well protect the user. The purpose for withstand voltage test is to protect the user from electric shock, and keep the user and contactor safety. To do the high voltage test can test the following items: ● Insulating strength of insulating material ●...