Site Electrical Wiring Guidelines - Juniper SRX5600 Hardware Manual

Site Electrical Wiring Guidelines

Table 32 on page 162 describes the factors you must consider while planning the electrical wiring at your
site.
WARNING:
electrical surge-suppression devices.
Table 32: Site Electrical Wiring Guidelines
Site Wiring Factor
Signaling limitations
Radio frequency
interference
Electromagnetic
compatibility
You must provide a properly grounded and shielded environment and use
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
162