Dc Power Copper Conductors Warning - Juniper T4000 Hardware Manual

Related
Documentation

DC Power Copper Conductors Warning

Copyright © 2018, Juniper Networks, Inc.
A DC-powered router that is equipped with a DC terminal block is intended only for
installation in a restricted access location. In the United States, a restricted access
area is one in accordance with Articles 110-16, 110-17, and 110-18 of the National Electrical
Code ANSI/NFPA 70.
NOTE: Primary overcurrent protection is provided by the building circuit
breaker. This breaker should protect against excess currents, short circuits,
and earth faults in accordance with NEC ANSI/NFPA70.
A DC-powered router is equipped with a DC terminal block that is rated for the power
requirements of a maximally configured router. To supply sufficient power, terminate
the DC input wiring on a facility DC source capable of supplying at least 60 A @ –48 VDC
per input for the six-input DC power supply.
Run two wires from the circuit breaker box to a source of 48 VDC. Use appropriate
gauge wire to handle up to 80 A for 60 A DC power cables or 100 A for 80 A DC power
cables. .
NOTE: Only 60 A feeds are currently supported.
Be sure to connect the ground wire or conduit to a solid office (earth) ground. A closed
loop ring is recommended for terminating the ground conductor at the ground stud.
Ensure that the polarity of the DC input wiring is correct. Under certain conditions,
connections with reversed polarity might trip the primary circuit breaker or damage
the equipment.
For personal safety, connect the green and yellow wire to safety (earth) ground at both
the router and the supply side of the DC wiring.
Because the router is a positive ground system, you must connect the positive lead to
the terminal labeled , the negative lead to the terminal labeled
RTN
ground to the chassis grounding points.
Site Electrical Wiring Guidelines on page 93
General Electrical Safety Guidelines and Warnings on page 421
T4000 DC Power System Electrical Specifications on page 101
WARNING: Use copper conductors only.
Waarschuwing Gebruik alleen koperen geleiders.
Varoitus Käytä vain kuparijohtimia.
Chapter 45: Electrical Safety Guidelines and Warnings
–48V
, and the earth
425