Table 9: Site Electrical Wiring Guidelines
Site Wiring Factor
Guidelines
Signaling limitations
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.
Radio frequency interference
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.
Electromagnetic compatibility
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
18
