2. Fasten the captive screws.
Figure 181: Optional Cable Restraint on a Three-Input 240-A DC Power
Supply
Connecting DC Power to a Three-Input 240-A DC Power Supply in a T640 Router
To connect a three-input 240-A DC power supply to the power sources:
1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
the strap to one of the ESD points on the chassis.
2. Verify that a licensed electrician has attached cable lugs to the power cables that you
supply.
3. Verify that the voltage across the DC power source cables leads is 0 V and that there
is no chance that the cables might become active during installation. If needed, switch
off the customer site circuit breakers.
4. Verify that the circuit breakers on the power supply faceplate are in the OFF
position (O).
5. Remove the clear plastic cover protecting the terminal studs on the faceplate.
6. Remove the nut and washer from each power terminal stud.
CAUTION: You must ensure that power connections maintain the proper
polarity. The power source cables might be labeled (+) and (–) to indicate
their polarity. There is no standard color coding for DC power cables. The
color coding used by the external DC power source at your site determines
363Copyright © 2017, Juniper Networks, Inc.
Chapter 29: Replacing Power System Components
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