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6.3 Preparing Grounding Exclusive to Transmission Lines
6
6.3 Preparing Grounding Exclusive to Transmission
Lines
For each twisted-pair cable transmission line, use a grounding bus bar having a unique
grounding terminal (Class D grounding), and ground the twisted-pair cables, hubs, and
other transmission parts to that grounding bus bar.
In a TC-net 100 system of dual transmission line configuration, ground line A and line B,
respectively, by Class D grounding at one point each. If there are two or more cascaded
hubs in the same building, the same grounding bus bar can be shared.
Common use of grounding bus bars having different grounding terminals and multiple-
point grounding must be avoided.
Caution
• If the cabinet is of the grounding (Class D) exclusive to the Integrated Controller, it can be
grounded common to the transmission parts, but if there is the mixed presence of cabinet
grounding and other equipment grounding, use the Class D grounding exclusive to the trans-
mission lines.
In this case, insulate the transmission parts from the cabinet. Ground the power lines for the
transmission parts (hubs, etc.) exclusive to the transmission parts.
• In grounding the twisted-pair cable transmission lines, prepare an exclusive means of Class
D grounding and ground each segment at one point.
• The cross sectional areas of grounding wires must meet the following requirements:
Between transmission parts or coaxial segments and grounding lead-in terminal: 2 mm
2
or
more (nominal)
Between grounding lead-in terminal and grounding bus bar: 8 mm
2
or more (nominal)
Grounding bus bar: 22 mm
2
or more (nominal)
• Do not join or cross grounding wires. Do not form grounding loops.
• If the twisted-pair cable transmission lines and transmission parts are not in the same build-
ing, use a grounding pole at each place of installation.
• If power noise is likely to be generated, use a noise filter in the power line of the transmission
parts, and ground it to the grounding pole exclusive to the Integrated Controller.
• Insulate the connectors, etc. to keep them free of contact with other metal parts.
• If a noise filter is used in the power line of the transmission parts, ground it to the grounding
pole of the Integrated Controller.
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