Where can the installation specifications for Class 1, 2, and 3 applications be found?

The installation specifications for Class 1, 2, and 3 applications are outlined in NEC Article 725. This article specifically addresses the requirements for the installation of limited energy circuits, which are categorized into Class 1, Class 2, and Class 3 circuits. Each class has its own unique characteristics and requirements, designed for different types of applications, such as signaling, power-limited systems, and control circuits.

Article 725 provides important details about the wiring methods, conductor sizing, power limitations, and installation techniques that must be followed to ensure safe and code-compliant installations. Familiarizing yourself with this article is crucial for anyone involved in low-voltage electrical work, as it lays the groundwork for adhering to safety standards and ensuring the proper functioning of these specialized circuits.

In contrast, other articles and chapters within the NEC focus on different aspects of electrical installations, such as general wiring methods or specific types of systems, which do not pertain exclusively to Class 1, 2, and 3 limited energy applications.