M320 Dc Power Cable Specifications; Table 32: Power And Grounding Cable Specifications - Juniper M320 Hardware Manual

Related
Documentation

M320 DC Power Cable Specifications

Copyright © 2010, Juniper Networks, Inc.
Appendix D: M320 Router Power Guidelines, Requirements, and Specifications
NOTE: If you plan to operate a maximally configured DC-powered router, we
recommend that you provision at least 65 A @ –48 VDC for the system, or
at least 48 A @ –48 VDC for each power supply. Use a facility circuit breaker
rated for 60 A (–48 VDC) minimum for each DC power supply. Doing so
enables you to operate the router in any configuration without upgrading the
power infrastructure.
If you plan to operate a DC-powered routerat less than the maximum
configuration and do not provision a 60 A (–48 VDC) circuit breaker, we
recommend that you provision a circuit breaker for each DC power supply
rated for at least 125% of the continuous current that the system draws at
–48 VDC.
M320 DC Power Supply on page 34
Connecting Power to a DC-Powered M320 Router on page 97
Site Electrical Wiring Guidelines for M Series, MX Series, and T Series Routers on page 249
The accessory box shipped with the router includes the cable lugs that attach to the
terminal studs of each power supply (see "M320 Chassis Grounding Cable and Lug
Specifications" on page 250). (The cable lug shown in "M320 Chassis Grounding Cable
and Lug Specifications" on page 250 is also used for the grounding the chassis.)
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.
Table 32 on page 257 summarizes the specifications for the power cables, which you must
supply.

Table 32: Power and Grounding Cable Specifications

Cable Type Quantity and Specification
Power Eight 4-AWG (21.2 mm
copper conductor, or as permitted by
the local code.
CAUTION: You must ensure that power connections maintain the proper
polarity. The power source cables might be labeled
their polarity. There is no standard color coding for DC power cables. The
color coding used by the external DC power source at your site determines
Connector Specification
2
) (minimum) Cable lug; dual hole, sized to fit
1/4-20 UNC terminal studs at
15.86-mm (0.625-in.) center line.
(+)
and to indicate
(–)
257