How to add Y capacitor in non-isolated switching power supply

The safety capacitor has a Y capacitor and an X capacitor; the X capacitor refers to a capacitor across the L-N; and the Y capacitor refers to a capacitor across the L-G/N-G. Today, I mainly introduce the Y capacitor. Do you know how to add the Y capacitor in the non-isolated switching power supply?

This is what the editor thinks is reasonable in the discussion area. The Y capacitor is usually added between the original secondary side, or the primary side to the ground, and the secondary side to the ground. The Y capacitor is not used in isolation. As long as the device can perform its function, there is no limitation. There is no such thing as isolation and non-isolation. In order to isolate the circuit into isolation, it is generally necessary to add an isolation transformer, and then there is a ground for the Y capacitor between the primary and secondary.