Appendix D T640 Power Guidelines, Requirements, And Specifications; T640 Chassis Grounding Cable And Lug Specifications - Juniper T640 Hardware Manual

APPENDIX D
T640 Power Guidelines, Requirements,
and Specifications

T640 Chassis Grounding Cable and Lug Specifications

Copyright © 2010, Juniper Networks, Inc.
T640 Chassis Grounding Cable and Lug Specifications on page 345
Site Electrical Wiring Guidelines for M Series and T Series Routers on page 346
T640 DC Power Specifications and Requirements on page 347
T640 AC Power Specifications and Requirements on page 355
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 179 on
page 346) 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 Figure 179 on page 346 is also 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 179 on page 346).
345