Juniper T640 Hardware Manual page 167

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CAUTION: You must ensure that power connections maintain the proper
polarity. The power source cables might be labeled
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
the color coding for the leads on the power cables that attach to the terminal
studs on each power supply.
CAUTION: Power cables must not block access to router components or
drape where people could trip on them.
T640 Power System Description on page 95
T640 DC Power System Electrical Specifications on page 125
T640 DC Power Supply Electrical Specifications on page 126
T640 General Electrical Safety Guidelines and Electrical Codes on page 529
Chapter 10: DC Power Requirements and Specifications
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