Juniper EX4500 Series, Руководство по оборудованию

Страница: 127 / 327

Table 44: Special Instructions to Follow Before Connecting Earth Ground to an EX Series Switch (continued)
Special Instructions Switch
If you plan to mount your switch on four posts of a rack or cabinet, mount your switch in the
rack or cabinet before attaching the grounding lug to the switch.
NOTE: The protective earthing terminal on switches mounted on four posts of a rack is
accessible through the slot on the left rear bracket only if the rack is 27.5 in. (69.85 cm) through
30.5 in. (77.47 cm) deep for a switch mounted flush with the rack front and 29.5 in. (74.93 cm)
through 32.5 in. (82.55 cm) deep for a switch mounted 2 in. (5.08 cm) recessed from the rack
front. See Figure 35 on page 127 .
Figure 35: Connecting the Grounding Lug to a Switch Mounted on Four Posts of a
Rack
g004479
3
—
1
—
Grounding lug Protective earthing terminal
4
—
2
—
Rear mounting-blade Side mounting-rail
NOTE: The brackets must be attached to the chassis before the grounding lug is attached. (The
brackets are shown pulled away from the chassis so that the protective earthing terminal is
seen.)
EX4200, EX4500,
and EX4550
Connecting Earth Ground to an EX Series Switch
To connect earth ground to an EX Series switch:
1. Verify that a licensed electrician has attached the cable lug to the grounding cable.
2. Connect one end of the grounding cable to a proper earth ground, such as the rack in which the switch
is mounted.
127