Cisco Nexus 7718 Hardware Installation Manual page 140

Connecting DC Power Supplies with Power Sources
Step 3 Size the power cables to the distance between the power supply and the DC power grid. If you need to cut
the cable, cut it at the end that connects to the DC power grid, remove 0.75 inch (19 mm) of insulation from
the cut ends, and attach them to the DC power system. Be sure to connect the negative cables to negative lines
and positive cables to positive lines.
Note
Warning
Step 4 Remove the three screws that hold down the safety cover for the terminal box on the front of the DC power
supply and remove the cover (see the following figure).
Note
Figure 37: Removing the Safety Cover for the Terminal Box on a 3-kW DC Power Supply
1 Remove three screws from the safety cover.
Step 5 Install four cables (two positive and two negative cables) in the four terminal slots as follows:
a) Unscrew the two nuts in each of the four terminal slots.
b) Attach and crimp each lug to the end of each power cable.
c) Attach each cable lug to the two terminal posts in each slot, fasten with two nuts, and tighten to 40 in-lb
(4.5 N·m).
Note
Cisco Nexus 7718 Switch Site Preparation and Hardware Installation Guide
130
For all your power connections, if you are using cables with two different colors, use one color cable
for all positive circuits and the other color for all negative circuits.
Hazardous voltage or energy may be present on DC power terminals. Always replace the cover
when the terminals are not in service. Be sure uninsulated conductors are not accessible when
cover is in place.
Statement 1075
The terminal box has four slots for four power terminals (ordered as negative [-], positive [+], positive
[+], and negative [-]). Each terminal has two nuts that you use to fasten a power cable to the terminal.
For all your power connections, if you are using cables with two different colors, use one color
cable for all positive circuits and the other color for all negative circuits.
Installing or Replacing Modules, Fan Trays, and Power Supplies
2 Remove the cover.
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