Juniper QFabric QFX3000-G Hardware Documentation page 459

Connecting Earth Ground to a QFX3008-I Interconnect Device
Copyright © 2018, Juniper Networks, Inc.
To meet safety and electromagnetic interference (EMI) requirements and to ensure
proper operation, we recommend that the QFX3008-I Interconnect device be adequately
grounded before it is connected to power.
Two pairs of threaded inserts (PEM nuts) are provided on the QFX3008-I Interconnect
device for connecting the device to earth ground. The first pair is sized for M6 screws and
is located below the wiring tray on the bottom left corner at the rear of the chassis. The
second pair is sized for UNC ¼-20 screws and is located below the second wiring tray on
the bottom right corner at the rear of the chassis. The grounding points are spaced 0.625
in. (15.86 mm) apart. The grounding lug required is a Panduit LCD2-14A-Q or equivalent.
The accessory box shipped with the device includes a cable lug and two UNC ¼-20
screws with integrated washers. For power cord and grounding cable specifications, see
"AC Power Cord Specifications for a QFX3008-I Interconnect Device with Single-Phase
Wiring Trays" on page 283,
Device with Three-Phase Delta Wiring Trays" on page
for a QFX3008-I Interconnect Device with Three-Phase Wye Wiring Trays" on page
and "Grounding Cable and Lug Specifications for a QFX3008-I Interconnect Device" on
page 61.
Before you begin to connect the QFX3008-I Interconnect device to earth ground:
Ensure that you understand how to prevent ESD damage. See
Electrostatic Discharge Damage" on page
Ensure that a licensed electrician has attached the grounding lug to an appropriate
grounding cable (see "Grounding Cable and Lug Specifications for a QFX3008-I
Interconnect Device" on page
CAUTION: Using a grounding cable with an incorrectly attached lug can
damage the device.
Ensure you have the following tools and parts available to connect a QFX3008-I
Interconnect device to earth ground:
Electrostatic discharge (ESD) grounding strap
Grounding cable (not provided) with attached lug
Screws and split washers to secure the grounding lug to the protective earthing terminal
(two UNC ¼-20 screws with integrated washers are provided)
Phillips (+) torque screwdriver, number 2
CAUTION: You must use an appropriate torque-controlled tool to tighten
the screws on the grounding lug. Applying excessive torque damages the
Chapter 29: Installing a QFX3008-I Interconnect Device
"AC Power Cord Specifications for a QFX3008-I Interconnect
285,
360.
61).
"AC Power Cord Specifications
286,
"Prevention of
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