What is the focus of Article 280 in the National Electrical Code?

Article 280 of the National Electrical Code specifically addresses surge arresters, which are devices designed to protect electrical equipment from voltage transients caused by lightning strikes and other external disturbances. The focus of this article is particularly on surge arresters that handle equipment and installations where voltage levels exceed 1 kV. Surge arresters play a crucial role in enhancing the reliability and lifespan of electrical systems by redirecting voltage surges safely to the ground, thus preventing damage to connected equipment.

This focus on surge arresters over 1 kV distinguishes it from other topics covered in the NEC. For instance, while surge-protective devices for lower voltage systems (1 kV or less) are addressed in a different part of the code, Article 280 is explicitly tailored to manage higher voltage scenarios, where the risks and impacts of electrical surges can be significantly greater. Understanding the specific application and requirements set forth in Article 280 is essential for professionals working in high-voltage environments to ensure effective protection measures are implemented.