Table 70: Site Electrical Wiring Guidelines - Juniper QFabric QFX3000-G Hardware Documentation

QFX3000-G QFabric System Hardware Documentation
Related
Documentation
Site Electrical Wiring Guidelines

Table 70: Site Electrical Wiring Guidelines

Site Wiring Factor
Signaling limitations
Radio frequency
interference
Electromagnetic
compatibility
Related
Documentation
Environmental Requirements and Specifications for a QFX3100 Director Device
218
Prevention of Electrostatic Discharge Damage on page 360
Table 70 on page 218 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.
Guidelines
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.
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.
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
General Safety Guidelines and Warnings on page 329
General Electrical Safety Guidelines and Warnings on page 359
The device must be installed in a rack or cabinet housed in a dry, clean, well-ventilated,
and temperature-controlled environment.
Follow these environmental guidelines:
The site must be as dust-free as possible, because dust can clog air intake vents and
filters, reducing the efficiency of the device cooling system.
Copyright © 2018, Juniper Networks, Inc.