Juniper EX4300 Series Hardware Manual page 210

To meet safety and electromagnetic interference (EMI) requirements and to ensure
proper operation, you must connect the chassis 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
EX Series Switch
• Install the power supply in the chassis. For instructions on installing a DC power supply in an EX4300
switch, see "Installing a DC Power Supply in an EX4300 Switch" on page
Ensure that you have the following parts and tools available:
• DC power source cables (14–16 AWG) with ring lug (Molex 190700067 or equivalent) (not provided)
• Phillips (+) screwdriver, number 2 (not provided)
• Multimeter (not provided)
• A 14-10 AWG STR (2.5-6 mm²), minimum 90°C wire grounding cable, or one permitted by the local
code, with a Panduit LCD10-10A-L or equivalent grounding lug attached (not provided)
• Two 10-32 x .25 in. screws with #10 split-lock washer (not provided)
• Two #10 flat washers (not provided)
EX4300 switches can be configured with up to two DC power supplies. 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.
To connect DC power to an EX4300 switch:
1. Attach the grounding strap to your bare wrist and to a site ESD point.
.
Connect Earth Ground to an
301.
200