The difference between the positive and negative poles of electric vehicle charger plugs can be achieved through the following methods:
1. Observe label stickers: Check the labels or stickers on the charger casing, which are usually clearly marked with positive and negative symbols by reputable manufacturers. This is the most direct and accurate method.
2. Judging by the color of the wire: If the plug is broken or there is no label sticker available for reference, it can be identified by the color of the wire. Generally, red or brown wires represent the positive pole, while blue or black wires represent the negative pole.
3. Use a multimeter for measurement: If you have a multimeter at hand, you can directly use the DC voltage range for measurement. Connect the red probe to one side of the plug and the black probe to the other side. If the multimeter displays a positive value or the pointer is offset in the positive direction, it indicates that the red probe is in contact with the positive pole; On the contrary, the black probe contacts the positive electrode, while the red probe contacts the negative electrode.
The above three methods can all be used to distinguish the positive and negative poles of electric vehicle charger plugs. It is recommended to choose the appropriate method according to the actual situation for operation. When connecting batteries or chargers, be sure to carefully check the positive and negative poles to avoid dangerous situations caused by reverse connection.