The so-called safety, popular point that the safety of the product requirements specification.

Such as a rice cooker, people in the course can not and the surrounding environment to cause harm, such as: electric shock, short circuit fire or something.

UL and VDE safety standards inherent differences between the UL specifications to prevent fire danger, VDE specifications are more about the safety of the operator for the power supply device, but the most stringent VDE electrical safety standards.

A. Transformer (skeleton, insulating tape, polyester insulating tape)
Two. Filter (skeleton, insulating tape, polyester insulating tape)
3. Optocoupler
4. Y capacitors
5 X capacitors
6. PCB material (including the yellow card of the system board)
7. Flammability of plastic materials (including the front panel power board support plastic column, power panels, insulation and PVC, fuse holders, power cord socket VH-3 etc.)
8. Fuse
9. Heat shrink tubing
10. Large-capacity electrolytic capacitor.
11. Various types of wire
Space distance (Creepage distance) / electrical clearance:

Separation measured by the shortest straight line distance between the two PCB terminal block or the interface between the conductive components and objects through the air.