•
A DC-powered device is equipped with a DC terminal block that is rated for the power
requirements of a maximally configured device.
NOTE: To supply sufficient power, terminatethe DC input wiring on a facility
DC source that is capable of supplying:
•
Minimum of 7.5 Aat–48 VDC for EX2200,EX2300, EX3300, and EX3400
switches
•
Minimum of 8 A at –48 VDC for EX3200 and EX4200 switches
•
Minimum of 20 A at –48 VDC for EX4300, EX4500, EX4550, and
QFX10002 switches
•
Minimum of 50 A at –48 VDC for EX6210 switches
•
Minimum of 60 A at –48 VDC for EX8208, QFX10008 and QFX10016
switches
•
Minimum of 100 A at –48 VDC for EX8216 switches
•
Minimum of 7 A at –48 VDC for QFX3500, EX4600, QFX5100,
QFX5110,and QFX5200 devices
•
Minimum of 8 A at –48 VDC for QFX3600 devices
•
Minimum of 7 A at –48 VDC for OCX1100 switches
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.
•
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.
277Copyright © 2017, Juniper Networks, Inc.
Chapter 31: Electrical Safety Guidelines and Warnings
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