Transformers for doorbells are classified under which type of circuits in the NEC?

Transformers for doorbells are classified as Class 2 circuits in the National Electrical Code (NEC). Class 2 circuits are designed to have a limited level of voltage and power to minimize the risk of fire and shock hazards. This classification allows for low-voltage installations that are safe for use in residential settings, such as doorbells, which typically operate at a low voltage.

Class 2 circuits provide an output voltage not exceeding 60 volts (or 30 volts for current-carrying conductors) and are subject to specific wiring and equipment requirements that assure safety. These circuits do not require the same level of installation procedures and can be installed with less stringent requirements compared to Class 1 circuits, which handle higher voltage applications.

Understanding the classification of circuits is essential in ensuring that electrical installations remain safe and compliant with the NEC. Class 2 transformers are thus ideal for applications like doorbells, where low voltage is suitable and safety is a priority.