Phase CA/C of AC input state.
Options:
1. normal(0) - indicates that the Phase CA/C of AC input state is normal
2. belowVoltage(1) - indicates that the Phase CA/C of AC input state is belowVoltage
3. exceedVoltage(2) - indicates that the Phase CA/C of AC input state is exceedVoltage
4. missing-phase(3) - indicates that the Phase CA/C of AC input state is missing-phase