T640 Dc Power Cable And Lug Specifications; Figure 240: T640 Dc Power Cable Lug - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide
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T640 DC Power Cable and Lug Specifications

432
Example of calculating power consumption for a maximum configuration under typical
voltage conditions:
Base System + 8 Enhanced Scaling FPC3 + 1 Host + 1 SCG + 32 PICs =
16.9 A + 8(9.1 A) + 2.6 A + 0.2 A + 32(1.2 A) =
16.9 A + 72.8 A + 2.6 A + 0.2 A + 38.4 A = 130.9 A @ –48 VDC = 6283 W
Current requirement adjustment for fans running at full speed (high temperature
environment or cooling component failure):
Calculated system current (X) – Cooling (normal) + Cooling (full speed) =
X A – 6.7 A + 22 A = X A + 15.3 A
Input current from a DC source other than –48 VDC (based on maximum configuration):
(–54 VDC input) x (input current X) = (–48 VDC) x (input current Y)
54 x X = 48 x 94.1 A
X = 48 x 94.1 A/54 = 83.6 A
Example of calculating system thermal output:
Watts DC/0.293 = BTU/hr
6283/0.293 = 21,444 BTU/hr
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
The accessory box shipped with the T640 router includes eighteen 4-AWG (21.2 mm
cable lugs for the DC cables that attach to the terminal studs of each power supply (see
Figure 240 on page 432). the number of DC cables and cable lugs required varies depending
on the power supply (see Table 61 on page
lug. One cable lug shown is also used for the grounding the chassis.
CAUTION: Before router installation begins, a licensed electrician must attach
a cable lug to the power cables that you supply. A cable with an incorrectly
attached lug can damage the router.

Figure 240: T640 DC Power Cable Lug

433). Each DC power cable requires one cable
Copyright © 2013, Juniper Networks, Inc.
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