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60 Planning the electrical installation
Use a double shielded twisted pair cable (see figure a) for analog signals. This type of cable
is recommended for the pulse encoder signals as well. Employ one individually shielded
pair for each signal. Do not use common return for different analog signals.
A double shielded cable is the best alternative for low voltage digital signals but single
shielded twisted multipair cable (figure b) is also acceptable.
a
b
Run analog and digital signals in separate, shielded cables.
Relay-controlled signals, providing their voltage does not exceed 48 V, can be run in the
same cables as digital input signals. It is recommended to run the relay-controlled signals
as twisted pairs.
Never mix 24 V DC and 115 / 230 V AC signals in the same cable.
Relay cable
￭
The cable type with braided metallic screen (for example, ÖLFLEX from Lapp Kabel,
Germany) has been tested and approved by ABB.
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