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6 F 3 B 0 3 6 2
b. Overview of wiring without protective pipes
(1) To protect the cables, cables should be passed through flooring ducts or wire protecting cable
covers should be used.
Note that these cables should not be laid adjacent to cables carrying high currents.
(2) Lay cables in gaps in the walls so that they will not be damaged, and run cables under the
flooring under equipment so that electromagnetic interference will not occur.
(3) Observe the applicable cable separation standards when running cables in parallel with, when
crossing, or when approaching low-voltage indoor power lines.
(4) Fasten cables every 3 meters so that the cables are not damaged when attaching cables to
walls to position the away from the floor, or when running cables vertically.
(5) When bending cables, be sure that the radius of curvature of the bend does not exceed the
bending limit for the cable used.
c. Notes on piped cabling
(1) Do not run coaxial cable and lines carrying high currents in the same pipe.
(2) When bending pipes, do not bend pipes to an angle sharper than 90 degrees.
(3) When bending pipes, the radius of curvature must be at least 6 times the internal diameter of
the pipe, and must be no smaller than the minimum radius of curvature for bending of the
enclosed cables.
(4) Ground metal pipes.
d. Separation from other wiring
As a general principle, coaxial cable should be separated by at least 2 meters from power lines and
equipment that generates electric or magnetic fields. If it is difficult to achieve a separation of 2
meters, look up the actual voltage and current of the induction source in the table below to
determine the separation distance. However, since transmitted signals are weak signals, restrict
induction sources to no more than 440 volts and 100 amperes.
Table 9.2 Recommended Minimum Separation Distance
Induction source Minimum separation for parallel lines (mm)
Voltage, current Over 100 A Up to 100 A Up to 50 A Up to 10 A
Over 440 V
Up to 440 V
Up to 220 V
Up to 110 V
Up to 60 V
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