recommend that the 48 VDC facility DC source should be equipped with a circuit breaker rated at 5
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
percent of the power provisioned for the input in accordance with the National Electrical Code in the
US and the Canadian Electrical Code in Canada.
• Run two wires from the circuit breaker box to a source of 48 VDC. Use appropriate gauge wire to
handle up to 5 A
• 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.
• 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.
• The marked input voltage of –48 VDC for a DC-powered router 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 router is a positive ground system, you must connect the positive lead to the terminal
l, the negative lead to the terminal labeled –, and the earth ground to the chassis grounding
points.
RELATED DOCUMENTATION
DC Power Electrical Safety Warnings for Juniper Networks Devices
DC Power Copper Conductors Warning
WARNING: Use copper conductors only.
Waarschuwing Gebruik alleen koperen geleiders.
Varoitus Käytä vain kuparijohtimia.
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