Juniper SRX 5800, Hardware Manual

Page: 165 / 536

Site Electrical Wiring Guidelines
Table 37 on page 166 describes the factors you must consider while planning the electrical wiring at your
site.
WARNING: You must provide a properly grounded and shielded environment and use
electrical surge-suppression devices.
Table 37: 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 SRX5800 Services Gateway Airflow and
Hardware Maintenance
When planning the installation site, you need to allow sufficient clearance around the rack (see
Figure 82 on page 167 ):
166