What is a Class 2 power supply?

Term class 2 power supply comes from the UL1310 standard section 28, where the AC adapters and power supplies are referred to as Class 2 transforms. Class 2 power supply is also called Class 2 power unit. Similar requirements are also placed in the IEC62368-1 standard, where the reference is made to as Limited Power Source (LPS).

Does a Class II power supply need a ground connection?

Products with Class II power supplies often display a symbol indicating double insulation, such as a square within a square. They do not require a ground connection for safety. Class II references a standard established by the International Electrical Commission (IEC) for electrical equipment including power supplies.

Do power supplies need a ground connection?

They do not require a ground connection for safety. Class II references a standard established by the International Electrical Commission (IEC) for electrical equipment including power supplies. Different IEC standards indicate to the installer and the user how the product will protect them against the risk of electrical shock.

What is a NEC power supply & circuit wiring requirement?

The NEC defines power supply and circuit wiring requirements that must be achieved from their power sources to their connected downstream equipment loads.