Juniper EX4300 Series Hardware Manual page 207

• Ensure that you have connected the device chassis to earth ground.
CAUTION: Before you connect power to the switch, a licensed electrician must attach
a cable lug to the grounding cable 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 the EX4300 switch to earth ground before you
connect it 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
Ground to an EX Series Switch
you plug the power supply in the switch into a grounded AC power outlet by using the
AC power cord appropriate for your geographical location (see
Specifications for an EX4300 Switch" on page
• Install the power supply in the chassis. For instructions on installing a power supply in an EX4300
switch, see "Installing an AC Power Supply in an EX4300 Switch" on page
EX4300 switches support 350 W, 715 W, or 1100 W AC power supplies depending on the switch
model. After you install at least one power supply, you can connect power to the switch.
CAUTION: Do not mix:
• AC and DC power supplies in the same chassis
• Power supplies with different airflow labels (AIR IN (AFI) and AIR OUT (AFO)) in the
same chassis.
• Fan modules with different airflow labels (AIR IN (AFI) and AIR OUT (AFO)) in the
same chassis.
• Power supplies and fan modules with different airflow labels (AIR IN (AFI) and AIR
OUT (AFO)) in the same chassis.
Ensure that you have the following parts and tools available:
• A power cord appropriate for your geographical location (provided)
NOTE: Each power supply must be connected to a dedicated power source outlet.
To connect AC power to an EX4300 switch:
. An EX4300 switch gains additional grounding when
105).
Connect Earth
"AC Power Cord
298.
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