Copper Conductors Warning; Dc Power Electrical Safety Guidelines And Warnings; Dc Power Electrical Safety Guidelines - Juniper Junos Pulse MAG2600 Hardware Manual

Copper Conductors Warning

DC Power Electrical Safety Guidelines and Warnings

Copyright © 2014, Juniper Networks, Inc.
Appendix A: Junos Pulse Gateway Power Guidelines, Requirements, and Specifications
WARNING: Use copper conductors only.
When working with DC-powered equipment, observe the following guidelines and
warnings:

DC Power Electrical Safety Guidelines

DC Power Disconnection Warning
DC Power Grounding Requirements and Warning
DC Power Wiring Sequence Warning
DC Power Wiring Terminations Warning
DC Power Electrical Safety Guidelines
The following electrical safety guidelines apply to a DC-powered Junos Pulse Gateway:
A DC-powered Junos Pulse Gateway is equipped with a DC terminal block that is rated
for the power requirements of a maximally configured Junos Pulse Gateway. To supply
sufficient power, terminate the DC input wiring on a facility DC source capable of
supplying at least 65 A @ –48 VDC for the system, or at least 48 A @ –48 VDC for
each power supply. We recommend that the 48 VDC facility DC source be equipped
with a circuit breaker rated at 60 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 USA and the Canadian Electrical Code in Canada.
Be sure to connect the ground wire or conduit to a solid (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 60 A.
A DC-powered Junos Pulse Gateway 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.
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