This read-write integer accepts none(1) or clear(2), and setting it to clear(2) zeroes out every event counter the Automatic Transfer Switch has accumulated (returning -1 if the device doesn't support the feature). It is useful when an admin wants a clean baseline after resolving a run of transfer or alarm events, so future counts reflect only new activity. For example, after replacing a failing utility feed that was causing repeated source-transfer events, an admin sets this to clear(2) so the next report starts from zero.