58
If the I/O wiring and power cables must be placed in the same duct (for example,
where they are connected to the equipment), they must be shielded from each
other using grounded metal plates.
Metal plate (iron)
123
200 mm min.
Grounding at resistance
of less than 100 Ω
Where: 1 = I/O wiring
2 = General control wiring
3 = Power cables
5-4 Preventing Noise
In order to prevent noise from interfering with the operation of the PC, use AWG
14 twisted-pair cables (cross-sectional area of at least 2 mm
2
). Avoid mounting
the PC close to high-power equipment, and make sure the point of installation is
at least 200 mm away from power cables as shown in the following diagram.
PC
200 mm min.
200 mm min.
Power lines
Whenever possible, use wiring conduit to hold the I/O wiring. Standard wiring
conduit should be used, and it should be long enough to completely contain the
I/O wiring and keep it separated from other cables.
Preventing Noise Section 5-4
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