Allied Telesis AT-SBx81CFC960 - Manual (Page 200)

Chapter 9: Powering On the Chassis
200 Section II: Installing the Chassis
Figure 142. Connecting the Positive Wire With Bare Wire
5. Wrap the negative lead wire clockwise around the remaining terminal
screw and secure the screw and wire to the negative terminal
connection on the terminal block with a #3 Phillips-head screwdriver,
as shown in Figure 143 on page 201. The negative terminal is on the
right.