Which article addresses Surge-Protective Devices (SPDs)?

Surge-protective devices (SPDs) are specifically addressed in Article 285 of the National Electrical Code (NEC). This article provides guidance on the installation and performance of SPDs to protect electrical equipment from voltage spikes or surges that can occur due to lightning strikes, utility switching, or other transient events.

Article 285 outlines important standards for the proper application of SPDs, including their location, markings, and installation instructions. This ensures that the devices effectively mitigate the risk of damage to electrical systems. Understanding the specific requirements and recommendations laid out in Article 285 is crucial for electrical contractors and engineers to ensure reliable and safe electrical systems.

The other articles mentioned do focus on various aspects of electrical installations, but they do not specifically address SPDs. For example, Article 280 relates to surge protection for various electrical equipment, while Article 300 covers general wiring methods and Article 310 discusses conductors for general wiring applications. However, none provide the focused and detailed directives that are found in Article 285 regarding SPDs.