Which classification do transformers and low-voltage wiring for doorbells fall under according to Article 725?

Transformers and low-voltage wiring for doorbells are classified under Class 2 according to Article 725 of the National Electrical Code (NEC). Class 2 circuits are designed for low-voltage applications, typically not exceeding 60 volts. This classification ensures that the circuits are safe to use and limits the amount of energy that can be supplied. Class 2 circuits are intended for applications that do not require the same level of protection as higher voltage circuits, making them ideal for devices like doorbells that demand lower voltages to operate safely.

Class 2 circuits also have specific requirements for installation and protection, which are less stringent compared to those for higher classes, reflecting the reduced risk associated with lower operating voltages. Therefore, using Class 2 classifications for transformers and doorbell wiring ensures compliance with safety standards while allowing for efficient operation of these low-voltage devices.