Planning the electrical installation 65
Selecting the control cables
All control cables must be shielded.
Use a double-shielded twisted pair cable for analog signals. Use one individually shielded
pair for each signal. Do not use a common return for different analog signals.
A double-shielded cable (Figure (a) below) is the best alternative for low-voltage digital
signals, but you can also use a single-shielded (b) twisted pair cable.
Signals in separate cables
Run analog and digital signals in separate, shielded cables.
Do not mix 24 V DC and 115/230 V AC signals in the same cable.
Signals allowed to be run in the same cable
Relay-controlled signals, if their voltage does not exceed 48 V, can be run in the same
cables as digital input signals. It is recommended that the relay-controlled signals be run
as twisted pairs.
Relay cable type
The cable type with braided metallic screen (for example, ÖLFLEX by LAPPKABEL,
Germany) was tested and approved by FIMER.
a b
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