Dc Power Disconnection Warning For Ex Series Switches - Juniper EX8208 Complete Hardware Manual

Juniper networks switch user manual
Hide thumbs Also See for EX8208:
Table of Contents

Advertisement

Related
Documentation

DC Power Disconnection Warning for EX Series Switches

Copyright © 2010, Juniper Networks, Inc.
A DC-powered device 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 must protect against excess currents, short circuits,
and earth grounding faults in accordance with NEC ANSI/NFPA 70.
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 device and the supply side of the DC wiring.
The marked input voltage of –48 VDC for a DC-powered device is the nominal voltage
associated with the battery circuit, and any higher voltages are only to be associated
with float voltages for the charging function.
Because the device is a positive ground system, you must connect the positive lead to
the terminal labeled RTN, the negative lead to the terminal labeled –48 VDC, and the
earth ground to the device grounding points.
General Safety Guidelines and Warnings for EX Series Switches on page 267
General Electrical Safety Guidelines and Warnings for EX Series Switches on page 297
DC Power Disconnection Warning for EX Series Switches on page 303
DC Power Grounding Requirements and Warning for EX Series Switches on page 305
DC Power Wiring Sequence Warning for EX Series Switches on page 306
DC Power Wiring Terminations Warning for EX Series Switches on page 308
Connecting DC Power to an EX3200 Switch
Connecting DC Power to an EX4200 Switch
Connecting DC Power to an EX4500 Switch
Connecting DC Power to an EX8200 Switch on page 171
Connecting DC Power to an XRE200 External Routing Engine
WARNING: Before performing any of the DC power procedures, ensure that
power is removed from the DC circuit. To ensure that all power is off, locate
the circuit breaker on the panel board that services the DC circuit, switch the
Chapter 21: Power and Electrical Safety Information
303

Advertisement

Table of Contents
loading

Table of Contents