Telect's TSP300-002 power system uses the following AC input terminal definition:

Terminal #1 = Ground
Terminal #2 = Rectifier 3-L1
Terminal #3 = Rectifier 2-L1
Terminal #4 = Rectifier 1-L1
Terminal #5 = Rectifier 3-N1
Terminal #6 = Rectifier 2-N1
Terminal #7 = Rectifier 1-N1