T640 Dc Power Distribution; Table 61: Number Of Cables Required; Table 62: T640 Power Cable Specifications - Juniper T640 Hardware Manual

Table 61: Number of Cables Required

Power Supply
2-input 160-A DC power supply
3-input 240-A DC power supply
4-input 240-A DC power supply
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T640 DC Power Distribution

Copyright © 2013, Juniper Networks, Inc.

Table 62: T640 Power Cable Specifications

Quantity and Specification
2
Eight 4-AWG (21.2 mm ) (minimum)
copper conductor, or as required by the
local code.
WARNING: For field-wiring connections, use copper conductors only.
For other electrical safety information, see
Guidelines and Electrical Codes" on page
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
the color coding for the leads on the power cables that attach to the terminal
studs on each power supply.
CAUTION: Power cables must not block access to router components or
drape where people could trip on them.
T640 Power System Description on page 60
T640 DC Power System Electrical Specifications on page 427
T640 DC Power Supply Electrical Specifications on page 428
T640 General Electrical Safety Guidelines and Electrical Codes on page 404
Most sites distribute DC power through a main conduit that leads to frame-mounted DC
power distribution panels, one of which might be located at the top of the rack that
Appendix D: T640 Power Guidelines, Requirements, and Specifications
Number of DC Cables per Power Supply
4
6
8
Connector Specification
Cable lug; dual hole, sized to fit 1/4-20 UNC terminal
studs at 15.86-mm (0.625-in.) center line.
"T640 General Electrical Safety
404.
and to indicate
(+) (–)
433