Appendix D Power Guidelines, Requirements, And Specifications For The M120; Router; M120 Chassis Grounding Specifications - Juniper Networks Hardware Manual

APPENDIX D
Power Guidelines, Requirements, and
Specifications for the M120 Router

M120 Chassis Grounding Specifications

Copyright © 2010, Juniper Networks, Inc.
All manuals and user guides at all-guides.com
M120 Chassis Grounding Specifications on page 229
M120 Router AC Power Specifications and Requirements on page 230
M120 Router DC Power Specifications and Requirements on page 233
Site Electrical Wiring Guidelines for M Series, MX Series, and T Series Routers on page 237
M120 Router Power Requirements on page 237
To meet safety and electromagnetic interference (EMI) requirements and to ensure
proper operation, the 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 AC-powered and DC-powered routers, 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 95 on page 230) 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
95 on page 230 is also used for the DC power cables.)
229