The 626PA6006-1 Neutral-Ground Monitor Plug-In is recommended for whenever a neutral is present in the distribution system. It is used to detect common mode impulses and can identify improper grounding conditions. The unit will monitor and record impulses, surges and overvoltages between neutral and ground on an AC power system. Measurement ranges & functions are optimized for neutral-to-ground monitoring including common mode transients. This unit includes a Terminal Strip (barrier type) Input.