Allied Telesis AT-SBx81CFC960 - Manual (Page 190)

Chapter 9: Powering On the Chassis
190 Section II: Installing the Chassis
Figure 133. Removing the Terminal Screws
6. With a #3 Phillips-head screwdriver, connect the positive (+) power
lead wire to the positive terminal on the power supply, with one of the
terminal screws removed in the previous step. The positive terminal is
on the left. You may attach the terminals with the wires either above or
below the terminal block. Figure 134 on page 191 shows the positive
wire above the terminal block.
Allied Telesis recommends tightening the screw to 30 to 40 inch-lbs.