Connecting Earth Ground to a QFX3500 Device
To meet safety and electromagnetic interference (EMI) requirements and to ensure
proper operation, you must connect the QFX3500 device to earth ground before you
connect it to power.
For installations that require a separate grounding conductor to the chassis, you must
attach a protective earthing terminal bracket on the QFX3500 device left front mounting
bracket to connect to the earth ground (see Figure 76 on page 265).
Before you connect earth ground to the protective earthing terminal of a QFX3500 device,
ensure that a licensed electrician has attached an appropriate grounding lug to the
grounding cable.
CAUTION: Using a grounding cable with an incorrectly attached lug can
damage the device.
NOTE: Mount your devicein the rackor cabinetbefore attaching the grounding
lug to the device. See “Mounting a QFX3500 Device in a Rack or Cabinet” on
page 261.
Ensure that you have the following parts and tools available:
•
Protective earthing terminal bracket—This L-shaped bracket attaches to a post on the
QFX3500 device left front mounting bracket, providing a protective earthing terminal
for the device. This bracket is provided in the accessory kit.
•
Grounding cable for your QFX3500 device—The grounding cable must be 14 AWG
(2 mm²), minimum 90° C wire, or as permitted by the local code.
•
Grounding lug for your grounding cable—The grounding lug required is a Panduit
LCD10-10A-L or equivalent. This grounding lug is provided in the accessory kit.
•
Three M4 hexnuts with integrated washers—One nut and washerarerequiredto secure
the grounding lug bracket to the left front mounting bracket, and two nuts and washers
are used to secure the grounding lug to the grounding lug bracket protective earthing
terminal. Four nuts are provided in the accessory kit.
•
7-mm wrench or socket with driver to attach all three nuts.
An AC-powered QFX3500 device chassis gains additional grounding when you plug the
power supply in the device into a grounded AC power outlet by using an AC power cord
appropriate for your geographical location. See “AC Power Cord Specifications for a
QFX3500 Device” on page 147.
To connect earth ground to a QFX3500 device:
Copyright © 2012, Juniper Networks, Inc.264
QFX3000 Hardware Documentation
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