Juniper EX4200 Series, Hardware Manual, Page: 202 / 344

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 171 .
•
Install the power supply in the chassis. For instructions on , see “Installing a Power
Supply in an EX4200 Switch” on page 211 .
Ensure that you have the following parts and tools available:
• DC power source cables (12–14 AWG) with ring lug (Molex 190700067 or equivalent)
(not provided)
•
Phillips (+) screwdriver, number 2
To connect DC power to the switch:
1.
Ensure that the power supplies are fully inserted in the chassis and the screws on their
faceplates are tightened.
2.
Ensure that the input circuit breaker is open so that the voltage across the DC power
source cable leads is 0 V and that the cable leads will not become active while you
are connecting DC power.
Copyright © 2015, Juniper Networks, Inc. 180
EX4200 Switch Hardware Guide