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

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MX2020 DC Power Electrical Safety Guidelines and Warnings

MX2020 DC Power Electrical Safety Guidelines

Copyright © 2015, Juniper Networks, Inc.
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General Electrical Safety Guidelines and Electrical Codes for Juniper Networks Devices
on page 583
MX2020 Three-Phase Wye AC Power Distribution Module Specifications on page 163
MX2020 Three-Phase Delta AC Power Distribution Module Specifications on page 163
Site Electrical Wiring Guidelines for MX Series Routers on page 592
MX2020 DC Power Electrical Safety Guidelines on page 585
DC Power Electrical Safety Warnings for Juniper Networks Devices on page 586
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.
Chapter 34: Electrical Safety Guidelines and Warnings
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