Cisco Catalyst 6840 Series Hardware Installation Manual page 70

Connecting to a DC Power Source
Warning
Hazardous voltage or energy may be present on DC power terminals. Always replace cover when terminals
are not in service. Be sure uninsulated conductors are not accessible when cover is in place. Statement 1075.
Procedure
Step 1
Turn off the power at the circuit breakers for the portions of the DC grid power that you are connecting to
and verify that all of the LEDs on the power supplies are off.
Step 2
Using a 1/8" flat head screwdriver or No. 1 Phillips head screwdriver, loosen the set screws on the connector
to freely accept the power wires. The connector will accept 8-24 AWG wires, use what your local electrical
code calls for.
Step 3
Strip 1/2" of insulation off the DC wires that you are using.
Step 4 Insert the black (DC negative) wire into the right aperture on the connector and tighten down the connection
set screw. Finger tight or about 3 ft./lbs should be sufficient.
Step 5 Insert the red (DC positive) wire into the left aperture on the connector and tighten down the connection set
screw. Do not tighten over 0.7 Nm.
Figure 28: Connecting to a DC Power Source
Step 6 For the powered down circuits connected to the power supplies, turn on the power at the circuit breaker. The
LEDs should flash and then the INPUT OK LED on the power supply should turn on.
Catalyst 6840-X Switch Series Hardware Installation Guide
58
Installing and Removing Power Supplies