Juniper QFX3500, Техническая документация

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Connecting Earth Ground to a QFX5100 Device
To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you
must connect the QFX5100 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 QFX5100 device left front mounting bracket to connect to the earth
ground (see Figure 72 on page 285 ).
Before you connect earth ground to the protective earthing terminal of a QFX5100 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
switch.
NOTE: Mount your switch in the rack or cabinet before attaching the grounding lug to the switch.
See “Mount a QFX5100 Device in a Rack or Cabinet” on page 279 .
Ensure that you have the following parts and tools available:
•
Protective earthing terminal bracket—This bracket attaches to the QFX5100 switch chassis through the
left front mounting bracket, providing a protective earthing terminal for the switch.
•
Grounding cable for your QFX5100 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.
•
Two SAE 10-32 washers and screws—To attach the grounding lug to the protective earthing terminal.
•
Screwdriver to attach the screws.
An AC-powered QFX5100 switch chassis gains additional grounding when you plug the power supply in
the switch into a grounded AC power outlet by using an AC power cord appropriate for your geographical
location. See “AC Power Cord Specifications for a QFX Series Device” on page 154 .
To connect earth ground to a QFX5100 device:
1. Attach one end of the grounding cable to an appropriate earth ground site, such as the mounting rack.
2. Position the grounding lug over the protective earthing terminal on the side of the chassis, which is
visible through the mounting bracket.
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