Connecting DC Power to an EX4200 Switch
The power supply in an EX4200 switch is a hot-removable and hot-insertable
field-replaceable unit (FRU) located on the rear panel: You can remove and replace it
without powering off the switch or disrupting switch functions.
Figure 43: DC Power Supply in an EX4200 Switch
WARNING: DC-powered EX4200 switches are intended for installation only
in a restricted access location.
Before you begin connecting DC power to an EX4200 switch:
•
Ensure that you have connected the switch chassis to earth ground.
CAUTION: Ensure that you install the power supply module first and then
install the DC input wire, before closing input breaker ON.
CAUTION: Before you connect power to the switch, a licensed electrician
must attach a cable lug to the grounding and power cables that you supply.
A cable with an incorrectly attached lug can damage the switch (for
example, by causing a short circuit).
To meet safety and electromagnetic interference (EMI) requirements and
to ensure proper operation, you must connect EX4200 switches to earth
ground before you connect them to power. For installations that require a
separate grounding conductor to the chassis, use the protective earthing
terminal on 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 143.
•
Install the power supply in the chassis. For instructions on , see “Installing a Power
Supply in an EX4200 Switch” on page 183.
Copyright © 2017, Juniper Networks, Inc.152
EX4200 Switch Hardware Guide
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