USB Charger

Author	Message
Volhout Guru Joined: 05/03/2018 Location: Netherlands Posts: 5994	Posted: 06:15am 10 Oct 2023       Seeing the picture, it is a 2 pin mains connection. This means it does not rely on safety ground pin in the socket. This makes it a class II device. For 250Vac class the isolation should (between mains and 5V side) be tested at 4240V (4.2kV) according to CE regulations. Whether this device meets that test voltage, I cannot tell. But Australian regulations may be different from European CE. Volhout P.S. if it had a safety ground connection (3 pin mains connector) the isolation test voltage would be 2120V (2kV). The 500V phil is referring to is the dielectric test voltage. This is the AC voltage that is used to measure the isolation resistance (in most cases more than 10 meg ohm, unless there is a waiver for this circuit). the 2120V (dc) or 4240V (dc) @ 1 minute, is to test potential flash over of the isolation barrier.