3 Installation and Wiring
3 - 18
NA-series Programmable Terminal Hardware User’s Manual (V117)
Wiring Methods
Observe the following points when wiring power supply and signal cables.
• When routing signal cables with different characteristics through the same duct, always keep
them separated.
• As much as possible, avoid routing multiple power supply lines through the same duct. If it cannot
be avoided, then construct a partition between them in the duct and ground the partition.
• To avoid overheating the conduits when using conduits for wiring, do not place wires for a single
circuit in separate conduits.
• Power cables and signal cables adversely affect each other. Do not wire them in parallel.
• Noise induction may occur if the NA Unit is installed in a panel that includes high-voltage devices.
Wire and install them as far apart as possible.
Partitioning Methods for Signal and Power Supply Cables
Signal
cables
(A)
Signal
cables
(C)
Signal
cables
(B)
(a) (b)
(c) (d)
Signal cables
Signal cables
Signal cables
Power supply
cables
Power supply
cables
Power supply
cables
Partition
Parallel Wiring (Single Phase)
Correct
Correct
Power supply
Incorrect
Power supply
Power supply
Load
Load
Load
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