Tx Matrix Plus Chassis Grounding Specifications; Figure 145: Grounding Cable Lug - Juniper TX MATRIX PLUS Hardware Manual

TX Matrix Plus Router Hardware Guide
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TX Matrix Plus Chassis Grounding Specifications

440
WARNING: For field-wiring connections, use copper conductors only.
TX Matrix Plus Power System Description on page 41.
Connecting Power to a Seven-Input 420-A Power Supply on page 167
TX Matrix Plus General Electrical Safety Guidelines on page 414
General Electrical Safety Warnings for M Series, MX Series, and T Series Routers on
page 417
TX Matrix Plus DC Power Electrical Safety Guidelines on page 421
DC Power Electrical Safety Warnings for M Series, MX Series, and T Series Routers on
page 422
To meet safety and electromagnetic interference (EMI) requirements and to ensure
proper operation, the TX Matrix Plus router must be adequately grounded before power
is connected. To ground the TX Matrix Plus router, connect a grounding cable to earth
ground and then attach it to the chassis grounding points using two screws.
Two pairs of threaded inserts (PEM nuts) are provided on the right rear of the chassis for
connecting the TX Matrix Plus router to earth ground. The bottom pair of grounding points
fits M6 screws (European), and the top 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 TX Matrix Plus router includes two UNC 1/4–20
screws used to secure the grounding cable to the right pair of grounding points and the
cable lug that attaches to the grounding cable (see Figure 145 on page 440). (The cable
lug shown in Figure 145 on page 440 is also used for the DC power cables.)

Figure 145: Grounding Cable Lug

The grounding cable must meet the requirements in Table 64 on page 441.The grounding
cable must be able to handle up to 60 A @ –48 VDC.
Copyright © 2010, Juniper Networks, Inc.