Site Electrical Wiring Guidelines; Table 18: Site Electrical Wiring Guidelines - Juniper QFX5200 Hardware Manual

QFX5200 Switch Hardware Guide
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Site Electrical Wiring Guidelines

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34
Prevention of Electrostatic Discharge Damage on page 156
Table 18 on page 34 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 18: Site Electrical Wiring Guidelines

Site Wiring Factor
Signaling limitations
Radio frequency interference
Electromagnetic compatibility
General Safety Guidelines and Warnings on page 127
General Electrical Safety Guidelines and Warnings on page 155
Prevention of Electrostatic Discharge Damage on page 156
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
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