•
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.
•
The marked input voltage of –48 VDC for a DC-powered device 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 device 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 device grounding points.
Related
Documentation
General Safety Guidelines and Warnings on page 253•
• General Electrical Safety Guidelines and Warnings on page 285
• DC Power Disconnection Warning on page 294
• DC Power Grounding Requirements and Warning on page 295
• DC Power Wiring Sequence Warning on page 296
• DC Power Wiring Terminations Warning on page 298
• Connecting DC Power to an EX2200 Switch
• Connecting DC Power to an EX3200 Switch
• Connecting DC Power to an EX4200 Switch
• Connecting DC Power to an EX4300 Switch
• Connecting DC Power to an EX4500 Switch
• Connecting DC Power to an EX4550 Switch on page 165
• Connecting DC Power to an EX4600 Switch
• Connecting DC Power to an EX6200 Switch
• Connecting DC Power to an EX8200 Switch
• Connecting DC Power to an EX9204 Switch
• Connecting DC Power to an EX9208 Switch
• Connecting DC Power to an EX9214 Switch
• Connecting DC Power to an OCX1100 Switch
• Connecting DC Power to an XRE200 External Routing Engine
• Connecting DC Power to a QFX3500, QFX3600, or QFX3600-I Device
• Connecting DC Power to a QFX5100 Device
293Copyright © 2015, Juniper Networks, Inc.
Chapter 30: Electrical Safety Guidelines and Warnings
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