Connecting Source Power to the Power Supplies
Cisco 12008 Gigabit Switch Router Installation and Configuration Guide
3-48
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 f or earth gro und, red is us ed 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.
Step4 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 Figure3-20a); tighten the nuts with a 10-mm nut
driver or 1/4-inch socket wrench. Dress the cable up to the right and away f rom
the power supply faceplate.
Caution Do not overtighten the nuts; a firm tightening only is recommended.
Step5 Repeat the procedure outlined in Step4 to connect the proper power cable to the
+ (positive) terminals on the power supply faceplate (see Figure 3-20b).
Step6 Repeat the procedure outlined in Step4 to connect the proper power cable to the
–(negative) terminals on the power supply faceplate (see Figure3-20c).
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.