CAUTION: It is particularly important to provide a properly grounded and shielded
environment and to use electrical surge-suppression devices.
Table 29: Site Electrical Wiring Guidelines
GuidelineSite Wiring Factor
To ensure that signaling functions optimally:
•
Install wires correctly.
Improperly installed wires can emit radio interference.
•
Do not exceed the recommended distances or pass wires between buildings.
The potential for damage from lightning strikes increases if wires exceed recommended
distances or if wires pass between buildings.
•
Shield all conductors.
The electromagnetic pulse (EMP) caused by lightning can damage unshielded
conductors and destroy electronic devices.
Signaling limitations
To reduce or eliminate the emission of RFI from your site wiring:
•
Use twisted-pair cable with a good distribution of grounding conductors.
•
Use a high-quality twisted-pair cable with one ground conductor for each data signal
when applicable, if you must exceed the recommended distances.
Radio frequency
interference (RFI)
Provide a properly grounded and shielded environment and use electrical
surge-suppression devices.
Strong sources of electromagnetic interference (EMI) can cause the following damage:
•
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.
TIP: If your site is susceptible to problems with EMC, particularly from lightning or radio
transmitters, you might want to seek expert advice.
Electromagnetic
compatibility (EMC)
95
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