Before You Begin - Juniper QFX5200 Hardware Manual

NOTE: The QFX5200-32C-L is only available for AC.
This topic includes:

Before You Begin

Before you begin connecting DC power to the switch:
• Ensure that you have taken the necessary precautions to prevent electrostatic discharge (ESD)
damage (see "Prevention of Electrostatic Discharge Damage" on page
• Ensure that you have connected the switch chassis to earth ground.
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 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
Earth Ground" on page
On QFX5200-32C-DC systems, you can also ground the chassis using the DC
protective earthing terminal on the DC power supply as an alternate method. This
method is useful if you are unable to access the chassis ground point by using the two-
holed grounding lug, see
page 111.
• Install the power supply in the chassis. For instructions on installing a power supply in a QFX5200,
see "Installing a Power Supply in a QFX5200" on page
Ensure that you have the following parts and tools available:
• For QFX5200-32C–DC power source cables (14–16 AWG) with ring lug (Molex 190700069 or
equivalent) (not provided)
• For QFX5200-48Y–DC power source cables (12 AWG) with ring lug (provided)
• Phillips (+) screwdriver, number 2 (not provided)
109.
"Alternate Method to Ground QFX5200-32C-DC Systems" on
133.
194).
"Connect the QFX5200 to
116