This value reports the current reading from current transformer CT8 on the Eaton Genesis II unit, expressed in tenths of an amp, with a special value of -1 meaning that CT channel is not present or unavailable on this particular unit. An admin monitors it as the last of the eight CT channels on the unit, watching for a reading of -1 to confirm this channel simply isn't wired on a given deployment. For example, a persistent -1 reading here on a unit known to only have six CTs installed would confirm this channel is expected to be unavailable rather than faulty.