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

Article 280 of the National Electrical Code specifically addresses surge arresters, making it essential for enhancing the protection of electrical systems from voltage surges. Surge arresters are critical devices designed to protect electrical equipment from short-duration overvoltage conditions that could result from lightning strikes or switching surges in power systems.

The focus on surge arresters for systems operating over 1 kV indicates the importance of safeguarding higher voltage electrical infrastructure, which is more vulnerable to severe surges that can damage equipment and disrupt operations. This is particularly relevant in industrial applications or substations where the potential for high-energy surges exists.

In contrast, other choices relate to different subjects contained within the NEC: surge-protective devices for systems operating at 1 kV or less, wiring methods, and general wiring conductors do not fall under Article 280. These different areas emphasize various aspects of electrical installations and safety but do not address the specific focus of surge arresters for high voltage systems that Article 280 covers.