Juniper MX480 Hardware Manual page 60

Figure 16: Typical DC Source Cabling to the Router
The DC power supplies in PEM0 and PEM1 must be powered by dedicated power feeds derived from
feed A, and the DC power supplies in PEM2 and PEM3 must be powered by dedicated power feeds derived
from feed B. This configuration provides the commonly deployed A/B feed redundancy for the system.
CAUTION:
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.
WARNING:
CAUTION:
drape where people could trip on them.
SEE ALSO
In Case of an Electrical Accident
Connecting Power to a DC-Powered MX480 Router with Normal Capacity Power Supplies | 257
Replacing an MX480 DC Power Supply Cable | 402
You must ensure that power connections maintain the proper polarity.
For field-wiring connections, use copper conductors only.
Power cords and cables must not block access to device components or
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