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Considering resistance to noise, we recommend using either covered metal cable ducts or
protective steel pipe. Table 9.3 lists the recommended minimum separations for parallel lines in
this case.
Table 9.3 Recommended Minimum Separation Distance
(Covered metal ducts and metal pipe) (Units: mm)
Cable installation method Covered metal ducts or metal pipe
Parallel separation Up to
10 meters
Up to
25 meters
Up to
100 meters
Up to
200 meters
Up to
500 meters
501 meters
or over
Power
cable
Up to 125 V, up to 10 A
Up to 250 V, up to 50 A
Up to 400 V, up to 100 A
Up to 500 V, up to 200 A
10
10
50
100
10
50
100
200
50
150
200
250
100
200
250
250
200
250
250
250
250
250
250
250
Levels exceeding the above At least 500
When using cable ducts, install steel separators to separate power cables from coaxial cables as
shown in the figure below.
Figure 9.1 Duct Internal Layout Example
When laying cables in a pit, use separators in the same manner as when ducts are used.
Figure 9.2 Pit Internal Layout Example
Metal duct
Separator
Coaxial cable
Power cable
Instrumentation power lines
Solenoid and other control signals
Separator (steel)
Power source
Ground
(with a resistance to ground of 100Ω or less)
Signal lines