Juniper EX4500 Series, Руководство по оборудованию, Страница: 122 / 327

To ensure proper operation and to meet safety and electromagnetic interference (EMI) requirements, you
must connect an EX Series 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 36 on page 128 ).
You must install the EX Series 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. See Table 43 on page 122 for the location of the earthing terminals on various EX Series switches.
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.
Parts and Tools Required for Connecting an EX Series Switch to Earth Ground
Before you begin connecting an EX Series switch to earth ground, ensure you have the parts and tools
required for your switch.
Table 43 on page 122 lists the earthing terminal location, grounding cable and lug specifications, and parts
needed for connecting an EX Series switch to earth ground.
Table 43: Parts Required for Connecting an EX Series Switch to Earth Ground
Additional
Information
Screws and
Washers
Grounding Lug
Specifications
Grounding
Cable
Requirements
Earthing
Terminal
Location Switch
•
Two
10-32 x .25 in.
screws with
#10 split-lock
washer—
not provided
•
Two #10 flat
washers—not
provided
Panduit
LCC10-14BWL or
equivalent—
not provided
14 AWG (2 mm²),
minimum 90° C
wire, or as
permitted by the
local code
Rear panel of
the chassis
EX2200
122