Juniper SRX5400 Hardware Manual page 203

The DC power supplies in slots PEM0 and PEM1 must be powered by dedicated power feeds derived
from feed A, and the DC power supplies in slots 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.
9. Route the power cables along the cable restraint toward the left or right corner of the chassis. If needed,
thread plastic cable ties, which you must provide, through the openings on the cable restraint to hold
the power cables in place.
10. Replace the clear plastic cover over the terminal studs on the faceplate.
11. Verify that the power cables are connected correctly, that they are not touching or blocking access to
device components, and that they do not drape where people could trip on them.
12. Repeat Steps 3 through
Figure 90: Connecting DC Power to the Device
11 for the remaining power supplies.
205