NEPSI's Metal-Enclosed Capacitor Banks and Harmonic Filter Banks come equipped with heavy duty distribution class polymer lightning arresters. These arresters are typically connected to the load-side terminals of the incoming air-disconnect switch. If desired, they can be connected to the line side terminals.

As an option, to provide a higher level of protection, the arresters can be changed to either station class or intermediate class. The lightning arresters are typically manufacturered by either Cooper Power Systems or General Electric. Arresters from other manufacturers can be supplied upon request.

Arrester voltage rating is chosen based on system grounding and expected normal and abnormal system over-voltage.