Juniper Networks EX4200 - Manual (Page 169)

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 appropriate for your geographical location. See “AC Power Cord
Specifications for EX3200 and EX4200 Switches” on page 98.
Before you connect earth ground to the protective earthing terminal on an EX4200
switch, 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
■ Washers and 10-32x.25-in. screws to secure the grounding lug to the protective
earthing terminal
■ 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. Place the grounding lug attached to the grounding cable over the protective
earthing 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 mounted on 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 29.5 in. deep through 32.5 in. deep for a switch mounted
2 in. recessed from the rack front.
Connecting Earth Ground to an EX4200 Switch ■ 143
Chapter 11: Connecting the Switch