Appendix D Power Guidelines, Requirements, And Specifications; Chassis Grounding Specifications; Grounding Cable Lug Specification - Juniper MX240 Hardware Manual

Appendix D
Power Guidelines, Requirements, and
Specifications

Chassis Grounding Specifications

Grounding Cable Lug Specification

Chassis Grounding Specifications on page 165
DC Power Specifications and Requirements on page 166
AC Power Specifications and Requirements on page 171
Site Electrical Wiring Guidelines on page 176
To meet safety and electromagnetic interference (EMI) requirements and to ensure
proper operation, the router must be adequately grounded before power is connected.
To ground AC-powered and DC-powered routers, you must connect a grounding
cable to earth ground and then attach it to the chassis grounding points using the
two screws provided.
Two threaded inserts (PEM nuts) are provided on the upper rear of the chassis for
connecting the router to earth ground. The grounding points fit UNC 1/4–20 screws
(American). The grounding points are spaced at 0.625-in. (15.86-mm)
centers.Figure 30 on page 55, or Figure 31 on page 58).
NOTE: Additional grounding is provided to an AC-powered router when you plug its
power supplies into grounded AC power receptacles.
The accessory box shipped with the router includes one cable lug that attaches to
the grounding cable (see Figure 61 on page 166) and two UNC 1/4–20 screws used
to secure the grounding cable to the grounding points.
Chassis Grounding Specifications
165