Juniper PTX5000 Hardware Manual page 291

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Figure 135: Connecting the DC Source Power Cable Lugs to an Input Power Terminal
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 the color coding for the leads
on the power cables that attach to the terminal studs on each power supply.
CAUTION: All inputs on the DC PDU in slot PDU0 must be powered by dedicated
power feeds derived from feed A, and all inputs on the DC PDU in slot PDU1 must
be powered by dedicated power feeds derived from feed B. This configuration
provides the commonly deployed A/B feed redundancy for the system.