⚫ DO NOT bundle a communication line with a protective earth conductor or a power line.
Moreover, keep away a communication line from the apparatus used as a noise source as much
as possible.
⚫ As radio frequency noise measure, place a ferrite core on both ends of the communication
cable.
When electromagnetic interference caused by radio frequency noise in frequency band (150
kHz to 1 GHz) affects communication, attaching ring ferrite cores to the cable is effective to
reduce communication failure.
Figure 39 - Example of ring ferrite core installation
⚫ Locate and secure the cables.
It may be difficult to measure the reproducibility of the communication failure without securing
the cables.
⚫ Avoid installing a power line and a communication line in the same metallic duct.
When unavoidable, separate a line with a metal separator certainly, and connect the duct
containing a metal separator certainly to GND, or installing a communication line put into
conductive pipes, such as metal.
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