What is the difference between American plug certification ETL and UL?

What is the difference between ETL and UL for American standard plugs? Regarding this issue, the Itanium editor has compiled a document for you, hoping to help you. Regarding this issue, let's also mention the voltage between China and the United States. Currently, China uses a voltage of 220V-230V, while the United States uses a voltage of 110V. Due to the different voltages used, the products have also undergone differentiation.

Moreover, the voltage of 110V and 220V also involved two world-renowned geniuses. After a heated debate between Edison and Tesla over whether they had strong DC or AC power, the United States gradually began to adopt 110V AC power.
So, why doesn't China learn from the United States and adopt an AC voltage of 110V? Because, after the United States adopted 110V AC voltage, Europe believed that 110V voltage was too low, and the loss in transmission was a bit large (at that time, voltage transformation and high-voltage transmission were not very common). It was not awesome to drive some electrical appliances, so it pushed 220V, which was inherited by most countries later.

This is one or two of them. We all know that the history of the United States is only a few hundred years old, and many of its facilities are very old. If changes need to be made comprehensively and rearranged, both human and material resources will be a big consumption. Therefore, the method of fixing wherever there are problems has been persisted until now.

The voltage, material, and shape of American standard plugs and domestic plugs are different. Therefore, to enter the United States, products need to undergo local certification to prove that your product is safe. UL certification is a certificate established and issued by UL Limited Liability Company, a global testing and certification agency and standard development agency in the United States. However, its price has been constantly increasing, and it is difficult to pass the testing and obtain the certificate. So the ETL certificate appeared. The name ETL comes from Edison's invention of electric light testing and was renamed "Electrical Testing Laboratories". ETL is a certification recognized by the United States and Canada, which is cheap and easy to pass. It has gradually replaced UL certification as the latest certification that must be done when entering the United States!