32 TC-net 100 Installation and Wiring Manual
Chapter 5 External Wiring (Twisted-Pair Cable)
5
5.1.2 Installation without piping
• For cable protection, either pass the cables through a floor duct or use a wire protector
cable cover. In this case, do not lay them together with wires or cables carrying high
current or high voltage.
• To keep the cables free from damage, lay them in the space between walls, or under
the floor where devices free of trouble by electromagnetic induction are located.
• In case of laying cables parallel with, close to, or across low-voltage indoor wires,
observe the cable separation standards specified in Table 5-2, and Table 5-3.
• In vertically laying cables on walls apart from the floor, be careful not to damage the
cables.
• When bending cables, make sure not to bend them in excess of the minimum
allowable bending radius specified for each cable.
5.1.3 Installation with piping
Use a pull box in connecting a duct to a cable connecting point different in diameter.
Duct length between adjacent pull boxes should be within 20 meters or, in cases where
the pipe duct is on the same horizontal level and straight throughout, within 25 meters.
• Do not lay cables along with other cables of high current in the same duct.
• When bending pipes, measure their bending angles as shown in figure 5-1 and make
sure that they are less than 90 degrees.
• When bending pipes, make sure that their bending radius is 6 times or more the pipe's
inside diameter and that each of the cables in the pipe does not exceed the minimum
allowable bending radius. (figure 5-1.)
• The number of bends per section should be 3 or less, and the total of their angles be
180 degrees or less.
• Ground metal pipes (Class D grounding). Make their grounding independent of the
grounding of the transmission lines (cables and transmission parts).
Figure 5-1 Pipe Bends
6 times or more
the pipe's inside
diameter
90
C or
less
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