Connecting Source Power to the Power Supplies
Note The color coding scheme used for the source DC power cables for the DC-input power supply depends on the scheme used for the site DC power source. Typically, green or green/yellow is used for earth ground, red is used for positive (+), and black is used for negative (–). Make certain that you properly map the color coding scheme used at the site for the DC power source to the proper terminals on the DC-input power supply faceplate.
Step 4 Remove the loosely mounted nuts and locking washers from the earth ground terminals on the power supply faceplate; place the grounding cable over the ground terminals; secure the cable in place on the terminals with the supplied nuts and locking washers (see Figure 3-20a); tighten the nuts with a 10-mm nut driver or 1/4-inch socket wrench. Dress the cable up to the right and away from the power supply faceplate.
Caution Do not overtighten the nuts; a firm tightening only is recommended.
Step 5 Repeat the procedure outlined in Step 4 to connect the proper power cable to the + (positive) terminals on the power supply faceplate (see Figure 3-20b).
Step 6 Repeat the procedure outlined in Step 4 to connect the proper power cable to the
– (negative) terminals on the power supply faceplate (see Figure 3-20c).
Note When securing the earth ground, positive (+), and negative (–) power cables to the power supply terminals, leave a small service loop in the earth ground cable. Doing so helps to ensure that the grounding cable will be the last one to be stressed or disconnected from the power supply if excessive strain is placed on the DC power cables.
3-48Cisco 12008 Gigabit Switch Router Installation and Configuration Guide
