T640 Chassis Grounding Cable And Lug Specifications - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide
Table 64: Site Preparation Checklist (continued)
Item or Task
Plan rack location, including required space
clearances.
If a rack is used, secure rack to floor and building
structure.
Cables
Acquire cables and connectors:
Determine the number of cables needed
based on your planned configuration.
Review the maximum distance allowed for
each cable. Choose the length of cable based
on the distance between the hardware
components being connected.
Plan the cable routing and management.
Related
Documentation

T640 Chassis Grounding Cable and Lug Specifications

118
For More Information
"T640 Clearance Requirements for
Airflow and Hardware Maintenance"
on page 122
"T640 Rack Requirements" on
page 120
"Calculating Power Budget and
Power Margin for Fiber-Optic Cables"
on page 142
"Maintaining T640 PICs and PIC
Cables" on page 454
T640 Router Installation Summary on page 151
T640 Installation Safety Guidelines on page 511
To meet safety and electromagnetic interference (EMI) requirements and to ensure
proper operation, the T640 router must be adequately grounded before power is
connected. Two pairs of threaded inserts (PEM nuts) are provided on the right rear of
the chassis for connecting the router to earth ground.
CAUTION: Before router installation begins, a licensed electrician must attach
a cable lug to the grounding and power cables that you supply. A cable with
an incorrectly attached lug can damage the router.
To ground the router, connect a grounding cable to earth ground and then attach it to
the chassis grounding points using two screws. The left pair of grounding points fits M6
screws (European), and the right pair fits UNC 1/4–20 screws (American). The grounding
points are spaced at 0.625-in. (15.86-mm) centers. The accessory box shipped with the
router includes the cable lug that attaches to the grounding cable (see
Figure 51 on page 119) and two UNC 1/4–20 screws used to secure the grounding cable
to the right pair of grounding points. (The cable lug shown in
used for the DC power cables.) The grounding cable must be able to handle up to 152 A.
The accessory box shipped with the router includes the cable lug that attaches to the
grounding cable (see Figure 51 on page
Performed By
Figure 51 on page 119
119).
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