Juniper EX9253 Hardware Manual page 92

• A grounding cable (minimum 14– 10 AWG (2– 5.3 mm² ), minimum 60° C wire or as permitted by
local code)— not provided
• Two M5 Pan Head screws to secure the grounding lug— provided in the accessory box shipped with
the switch
• A 14 AWG ground terminal lug sized for #10 screw (Panduit LCD10-14B-L or equivalent)— provided
• A Phillips (+) screwdrivers, numbers 2 (not provided)
• An electrostatic discharge (ESD) grounding wrist strap
To ensure proper operation and to meet safety and electromagnetic interference (EMI) requirements,
you must connect an EX9253 switch to earth ground before you connect power to the switch. You must
use the protective earthing terminal on the switch chassis to connect the switch to earth ground (see
Figure 28 on page 84).
You must install the EX9253 switch in a restricted–access location and ensure that the chassis is always
properly grounded. EX Series switches have a two–hole protective grounding terminal provided on the
chassis. We recommend that you use the protective grounding terminal as the preferred method for
grounding the chassis regardless of the power supply configuration. However, if additional grounding
methods are available, you can also use those methods. For example, you can use the grounding wire in
the power cord of an AC power supply or use the grounding terminal or lug on a DC power supply. This
system was tested to meet or exceed all applicable EMC regulatory requirements with the two-hole
protective grounding terminal connected correctly.
Ensure that a licensed electrician has attached an appropriate grounding lug to the grounding cable you
supply. Using a grounding cable with an incorrectly attached lug can damage the switch.
To connect earth ground to a switch:
CAUTION: A licensed electrician must attach the grounding lug to the grounding cable.
1. Wrap and fasten one end of an ESD wrist strap around your bare wrist, and connect the other end of
the strap to the ESD point on the switch.
2. Ensure that all grounding surfaces are clean and brought to a bright finish before grounding
connections are made.
3. Connect the grounding cable to a proper earth ground.
4. Detach the ESD grounding strap from the ESD point on the switch.
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