Connecting Earth Ground To A Qfx3500 Device - Juniper QFX5110 Series Hardware Documentation

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 105 on page
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:
device.
NOTE: Mount your device in the rack or cabinet before attaching the grounding lug to the device.
See "Mounting a QFX3500 Device in a Rack or Cabinet" on page
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 hex nuts with integrated washers—One nut and washer are required to 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 QFX Series Device" on page
To connect earth ground to a QFX3500 device:
335).
Using a grounding cable with an incorrectly attached lug can damage the
328.
154.
334