Mx480 Dc Power Electrical Safety Guidelines And Warnings; Mx480 Dc Power Electrical Safety Guidelines; Dc Power Electrical Safety Warnings For Juniper Networks Hardware; Equipment - Juniper MX480 Hardware Manual

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MX480 DC Power Electrical Safety Guidelines and Warnings

Copyright © 2011, Juniper Networks, Inc.
Appendix A: Safety and Regulatory Compliance Information for the MX480 Router
Blue—Neutral
Brown—Live
AC Electrical Specifications for the MX480 Router on page 276
Calculating Power Requirements for MX480 Routers on page 269
AC Power Circuit Breaker Requirements for the MX480 Router on page 277
AC Power Cord Specifications for the MX480 Router on page 277
Connecting Power to an AC-Powered MX480 Router with Normal-Capacity Power
Supplies on page 97
MX480 DC Power Electrical Safety Guidelines on page 255

DC Power Electrical Safety Warnings for Juniper Networks Hardware

Equipment on page 256

MX480 DC Power Electrical Safety Guidelines

The following electrical safety guidelines apply to a DC-powered router:
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 58 A (32 A per
feed) @ –48 VDC for the system. The 48 VDC facility DC source should be equipped
with a circuit breaker rated at 40 A (–48 VDC) minimum. Incorporate an easily
accessible disconnect device into the facility wiring. In the United States and Canada,
the 48 VDC facility should be equipped with a circuit breaker rated 40 A (–48 VDC)
or a minimum of 125% of the power provisioned for the input in accordance with the
National Electrical Code in the US and the Canadian Electrical Code in Canada. 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.
Run two wires from the circuit breaker box to a source of 48 VDC. Use appropriate
gauge wire to handle up to 50 A.
A DC-powered router that is equipped with a DC terminal block is intended for
installation only 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.
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