the switch chassis to connect to the earth ground. For instructions on
connecting earth ground, see “Connecting Earth Ground to an EX Series
Switch” on page 83.
Ensure that you have the following parts and tools available:
•
DC power source cables (14 AWG) with ring lug (Molex 0190700067 or equivalent)
(not provided) attached to them by a licensed electrician
•
Phillips (+) screwdriver, number 2
To connect DC power to the switch:
1. Ensure that the input circuit breaker is open so that the cable leads will not become
active while you are connecting DC power.
NOTE: The DC power supply in the switch has four terminals labeled A+,
B+, A–, and B– for connecting DC power source cables labeled
positive (+) and negative (–). The terminals are covered by a clear plastic
cover.
NOTE: The A+ and B+ terminals are referred to as +RTN and A– and B–
terminals arereferredtoas –48 V in “DC Power Wiring SequenceWarning”
on page 167 and “DC Power Electrical Safety Guidelines” on page 162.
2. Grasp the plastic cover in the middle, gently flex it outwards, and pull it out. Save the
cover.
3. Remove the screws on the terminals using the screwdriver. Save the screws.
WARNING: Ensure that the power cables do not block access to switch
components or drape where people can trip on them.
4. Connect the power supply to the power sources. Secure power source cables to the
power supply by screwing the ring lugs attached to the cables to the appropriate
terminals by using the screw from the terminals (see Figure 37 on page 94).
93Copyright © 2011, Juniper Networks, Inc.
Chapter 11: Connecting the Switch
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