This reports whether the low-voltage alarm tied to load bank 2's voltage-based disconnect (disconnect2Voltage) is currently active, per the description. Because bank 2 is typically the middle tier, shed after bank 1 but before bank 3, an active status here means the bus voltage has fallen close to the disconnect2Voltage threshold and that specific bank is at risk of being shed imminently. An active(2) status combined with a bus voltage only slightly above disconnect2Voltage would tell the admin bank 2 is likely to shed within minutes if AC power isn't restored.