Dc Power Electrical Safety Guidelines For Switches - Juniper QFX5100 Hardware Manual

QFX5100 Switch Hardware Guide

DC Power Electrical Safety Guidelines for Switches

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This topic applies to hardware devices in the EX Series product family, which includes
EX Series switches and the XRE200 External Routing Engine.
This topic also applies to hardware devices in the QFX Series and to OCX1100 switches.
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, terminate the DC input wiring on a facility
DC source that is capable of supplying:
Minimum of 7.5 A at –48 VDC for EX2200, 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.
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