CAUTION: For Juniper systems with AC power supplies, an external surge
protective device (SPD) must be used at the AC power source.
Related
Documentation
T640 Three-Phase Delta and Wye AC Power Supply Description on page 106•
• T640 General Electrical Safety Guidelines and Electrical Codes on page 529
• General Electrical Safety Warnings for Juniper Networks Devices on page 530
Site Electrical Wiring Guidelines for Juniper Networks Devices
•
Distance Limitations for Signaling on page 538
•
Radio Frequency Interference on page 538
•
Electromagnetic Compatibility on page 538
Distance Limitations for Signaling
Improperly installed wires can emit radio interference. In addition, the potential for damage
from lightning strikes increases if wires exceed recommended distances or if wires pass
between buildings. The electromagnetic pulse (EMP) caused by lightning can damage
unshielded conductors and destroy electronic devices. If your site has previously
experienced such problems, you might want to consult experts in electrical surge
suppression and shielding.
Radio Frequency Interference
You can reduce or eliminate the emission of radio frequency interference (RFI) from your
site wiring by using twisted-pair cable with a good distribution of grounding conductors.
If you must exceed the recommended distances, use a high-quality twisted-pair cable
with one ground conductor for each data signal when applicable.
Electromagnetic Compatibility
If your site is susceptible to problems with electromagnetic compatibility (EMC),
particularly from lightning or radio transmitters, you might want to seek expert advice.
Strong sources of electromagnetic interference (EMI) can destroy the signal drivers and
receivers in the network device and conduct power surges over the lines into the
equipment, resulting in an electrical hazard. It is particularly important to provide a properly
grounded and shielded environment and to use electrical surge-suppression devices.
CAUTION: To comply with intrabuilding lightning and surge requirements,
intrabuilding wiring must be shielded, and the shield for the wiring must be
grounded at both ends.
Copyright © 2017, Juniper Networks, Inc.538
T640 Core Router Hardware Guide
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