connecting earth ground, see “Connecting Earth Ground to an EX Series
Switch” on page 155.
NOTE: Grounding is required for DC systems and recommended for AC
systems.
Ensure that you have taken the necessary precautions to prevent electrostatic discharge
(ESD) damage (see “Prevention of Electrostatic Discharge Damage” on page 253).
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 do not become
active while you are connecting DC power.
NOTE: The DC power supply in the switch has four terminals labeled
INPUT 1+, INPUT 1–, INPUT 2+, and INPUT 2– for connecting DC power
source cables labeled positive (+) and negative (–). The terminals are
covered by a clear plastic cover.
NOTE: The INPUT 1+ and INPUT 2+ terminals are referred to as +RTN and
INPUT 1– and INPUT 2– terminals are referred to as –48 V in “DC Power
Wiring Sequence Warning” on page 261 and “DC Power Electrical Safety
Guidelines for Switches” on page 256.
2. Grasp the plastic cover in the middle, gently bend it outward, and pull it out. Save the
cover.
3. Remove the screws on the terminals by 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 60 on page 165).
Copyright © 2017, Juniper Networks, Inc.164
EX2300-C and EX2300 Switches Hardware Guide