Juniper Networks J4350 - Manual (Page 229)

Safety and Regulatory Compliance Information
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 8 A @ –48 VDC. Incorporate an easily accessible disconnect
device into the facility wiring. 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.
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.
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 labeled
RTN , the negative lead to the terminal labeled
–48 VDC , and the earth ground to the chassis grounding points.
Power Sources for Redundant Power Supplies
If your J6350 Services Router includes an optional redundant DC power
supply, connect each of the two power supplies to different input power
sources. Failure to do so makes the router susceptible to total power
failure if one of the power supplies fails.
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Safety Guidelines and Warnings 209