Site Electrical Wiring Guidelines; Distance Limitations For Signaling; Radio Frequency Interference; Electromagnetic Compatibility - Juniper SRX 5600 Hardware Manual

SRX 5600 Services Gateway Hardware Guide
WARNING: The AC power cord for the services gateway is intended for use with the
services gateway only and not for any other use.
NOTE: In North America, AC power cords must not exceed 4.5 m (approximately
14.75 ft) in length, to comply with National Electrical Code (NEC) Sections 400-8
(NFPA 75, 5-2.2) and 210-52, and Canadian Electrical Code (CEC) Section 4-010(3).
The cords supplied with the services gateway are in compliance.
For information about the AC power supply, including a description of components,
see "AC Power Supply" on page 28. For instructions on connecting the power cord
during initial installation, see "Connecting Power to an AC-Powered Services Gateway"
on page 64. For instructions on replacing the AC power cord, see "Replacing an AC
Power Cord" on page 140.

Site Electrical Wiring Guidelines

Distance Limitations for Signaling

Improperly installed wires can emit radio interference. In addition, the potential for
damage from lightning strikes increases if wires exceed recommended distances, or
if wires pass between buildings. The electromagnetic pulse (EMP) caused by lightning
can damage unshielded conductors and destroy electronic devices. If your site has
previously experienced such problems, you might want to consult experts in electrical
surge suppression and shielding.

Radio Frequency Interference

You can reduce or eliminate the emission of radio frequency interference (RFI) from
your site wiring by using 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.

Electromagnetic Compatibility

If your site is susceptible to problems with electromagnetic compatibility (EMC),
particularly from lightning or radio transmitters, you might want to seek expert
advice. Strong sources of electromagnetic interference (EMI) can destroy the signal
drivers and receivers in the services gateway and conduct power surges over the
lines into the equipment, resulting in an electrical hazard. It is particularly important
to provide a properly grounded and shielded environment and to use electrical
surge-suppression devices.
CAUTION: To comply with intrabuilding lightning/surge requirements, intrabuilding
wiring must be shielded, and the shield for the wiring must be grounded at both
ends.
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Site Electrical Wiring Guidelines