3. Securethe grounding lug to the protectiveearthing terminal with screws.
4. Dressthe grounding cable and ensurethat it does not touch or block access to other
switchcomponents and that it does not drape where people couldtrip over it.
ConnectingEarth Ground to an EX4200 Switch
Theprotective earthing terminal is locatedon the left side of the chassis in an EX4200
switch.
AnAC-powered EX Series switch chassisgets additional grounding when you plug the
powersupply in the switch into a grounded ACpower outlet by using an AC power cord
appropriateforyour geographical location.See AC PowerCord Specifications for EX3200
andEX4200 Switches.
Ensurethat you have the following partsand tools available:
•Groundingcable for your EX4200 switch—Thegrounding cable must be minimum
14AWG (2 mm²), minimum 90°C wire, or as permittedby the local code.
•Groundinglug for your grounding cable—Thegrounding lug required is a Panduit
LCD6-14BH-Lor equivalent.
•Washersand10-32x.25-in. screws to secure the groundinglug to the protective earthing
terminal
NOTE: Someearly models of EX4200 switches require10-24x.25-in. screws rather
than10-32x.25-in. screws. If the Juniper Networks product number on the labelnext to
theprotective earthing terminal is from 750-021xxx through 750-030xxx, the switch
requires10-24x.25-in. screws.
•Phillips(+) screwdriver, number 2
Toconnect earthground to an EX4200 switch:
1. Connectone end of the grounding cable to a proper earth ground,such as the rack
inwhich the switch is mounted.
2. Placethe grounding lugattached to the grounding cable overthe protective earthing
terminal.See Figure 64 on page 167.
Ifyou mounted an EX4200 switch on four posts of a rack using the four-post
rack-mountkit, the protective earthing terminal on the switchis accessible through
theslot on the left rear bracket. SeeFigure 65 on page 170.
NOTE: Theprotective earthing terminalon an EX4200 switch mounted on four posts
isavailable only if the rack is 27.5in. deep through 30.5 in. deep for a switch mounted
flushwith the rack front and 29.5 in. deep through 32.5 in. deep fora switch mounted
2in. recessed from the rack front.
169Copyright© 2010, Juniper Networks,Inc.
Chapter10: Connecting the Switch