Mx2020 Dc Power Electrical Safety Guidelines And Warnings; Mx2020 Dc Power Electrical Safety Guidelines - Juniper MX2020 Hardware Manual

MX2020 3D Universal Edge Router Hardware Guide

MX2020 DC Power Electrical Safety Guidelines and Warnings

342
General Safety Guidelines for Juniper Networks Devices on page 317
General Safety Warnings for Juniper Networks Devices on page 318
MX2020 DC Power Electrical Safety Guidelines on page 342
DC Power Electrical Safety Warnings for Juniper Networks Devices on page 343

MX2020 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 60 A per
feed @ –48 VDC (nominal) for the system. We recommend that the 48 VDC facility
DC source be equipped with a circuit breaker rated at 80 A (–48 VDC) minimum, or
as required by local code. 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 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 80 A.
A DC-powered router that is equipped with a DC terminal block is intended for
installation in a restricted access location only. 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.
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.
Copyright © 2013, Juniper Networks, Inc.