A threshold that indicates the current drawn is nearing
an overload condition. It is represented in Amps.
A warning will be issued when the load is greater than
or equal to the threshold value.
Minimum value must be greater than the value returned by
the atsConfigPhaseLowLoadThreshold OID.
Maximum value must be less than or equal to the value
returned by the atsConfigPhaseOverLoadThreshold OID.