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.
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.
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