Juniper NFX150, Руководство по оборудованию

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Site Electrical Wiring Guidelines
Table 22 on page 45 describes the factors you must consider while planning the electrical
wiring at your site.
WARNING: It is particularly important to provide a properly grounded and
shielded environment and to use electrical surge-suppression devices.
Table 22: Site Electrical Wiring Guidelines
Guidelines Site Wiring Factor
If your site experiences any of the following problems, consult experts in electrical surge
suppression and shielding:
•
Improperly installed wires cause radio frequency interference (RFI).
• Damage from lightning strikes occurs when wires exceed recommended distances or pass
between buildings.
•
Electromagnetic pulses (EMPs) caused by lightning damage unshielded conductors and
electronic devices.
Signaling limitations
To reduce or eliminate RFI from your site wiring, do the following:
• Use a 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.
Radio frequency
interference
If your site is susceptible to problems with electromagnetic compatibility (EMC), particularly from
lightning or radio transmitters, seek expert advice.
Some of the problems caused by strong sources of electromagnetic interference (EMI) are:
• Destruction of the signal drivers and receivers in the device
•
Electrical hazards as a result of power surges conducted over the lines into the equipment
Electromagnetic
compatibility
Clearance Requirements for Airflow and Hardware Maintenance for an NFX150 Device
When planning the site for installing an NFX150 device, you must allow sufficient clearance
around the installed chassis (see
Figure 18 on page 46 and Figure 19 on page 46 ).
45 Copyright © 2018, Juniper Networks, Inc.
Chapter 2: Site Planning, Preparation, and Specifications