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3. Secure the grounding lug to the protective earthing terminal with screws.
4. Dressthe groundingcable and ensurethatit does nottouch orblockaccesstoother
switch components and that it does not drape where people could trip over it.
Connecting Earth Ground to an EX4200 Switch
The protective earthing terminal is located on the left side of the chassis in an EX4200
switch.
An AC-powered EX Series switch chassis gets additional grounding when you plug the
power supply in the switch into a grounded AC power outlet by using an AC power cord
appropriateforyourgeographicallocation.See“ACPowerCordSpecificationsforEX3200
and EX4200 Switches” on page 102.
Ensure that you have the following parts and tools available:
•
Grounding cable for your EX4200 switch—The grounding cable must be minimum
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
LCD6-14BH-L or equivalent.
•
Washersand10-32x.25-in.screwstosecurethegroundinglugtotheprotectiveearthing
terminal
NOTE: Some early models of EX4200 switches require 10-24x.25-in. screws rather
than 10-32x.25-in. screws.If the Juniper Networks product number on the label nextto
the protective earthing terminal is from 750-021xxx through 750-030xxx, the switch
requires 10-24x.25-in.screws.
•
Phillips (+) screwdriver, number 2
To connect earth ground to an EX4200 switch:
1. Connect one end of the grounding cable to a proper earth ground, such as the rack
in which the switch is mounted.
2. Placethe groundinglugattachedtothe groundingcableovertheprotectiveearthing
terminal. See Figure 52 on page 141.
If you mounted an EX4200 switch on four posts of a rack using the four-post
rack-mount kit, the protective earthing terminal on the switch is accessible through
the slot on the left rear bracket. See Figure 53 on page 144.
NOTE: The protective earthing terminal on an EX4200 switch mountedon four posts
is available only if the rack is 27.5 in. deep through 30.5 in. deep for a switch mounted
flush with the rack front and 29.5in. deep through 32.5 in. deep for a switch mounted
2 in. recessed from the rack front.
143Copyright©2010,Juniper Networks,Inc.
Chapter11:Connectingthe Switch