A threshold that indicates the current drawn has entered
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 or equal to the value
returned by the atsConfigPhaseNearOverLoadThreshold OID.
Maximum value must be less than or equal to the value
returned by atsIdentDeviceRating OID.