ITech IT6121B User Manual page 13

Inspection and Installation
In the above illustration, one end of the AC power cord is connected to the AC
input terminal in the rear panel of the power supply. Connect the wire, zero line
and ground to the corresponding terminal of the device. Before inserting,
please loose the screw, lock the screw when it is inserted.
Connect the three terminals red to line (L), black to neutral (N), and yellow to
ground (G) on the other end of the power cord to your AC distribution panel.
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