Which article pertains to surge arresters for electrical systems over 1000 volts?

The correct choice refers to Article 280 of the National Electrical Code (NEC), which specifically addresses the requirements and regulations for surge arresters used in electrical systems. This article provides guidance on the installation, application, and maintenance of surge arresters to protect electrical equipment from voltage spikes caused by lightning strikes, switching operations, or other disturbances.

Understanding the context of surge arresters is crucial, especially in systems operating at voltages over 1000 volts, where the potential for damage from transients is significantly higher. Properly implementing surge protection is essential for ensuring the reliability and longevity of electrical systems at these voltage levels.

In contrast, other articles such as Article 300 focuses on general requirements for wiring methods and installation, while Article 310 discusses conductors for general wiring. Article 285 pertains to surge protective devices and systems, but it does not cover surge arresters specifically for systems over 1000 volts, making Article 280 the appropriate reference for this particular question.