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Is there any requirement for cable selection for incremental encoder (HTL) conencted to ATV930 ?

There is no specific requirement for encoder cable. For short distance (several meters) it is enough to buy 7x0.14mm2 shielded cable from local producer/distributor.
But for big distances, bear in mind voltage drop. Instruction sheet of dedicated encoder (example from ATV930 HTL encoder card VW3A3424 here below) shows minimum cross-section depending on encoder cable length and consumption.

Also check the encoder signals required by encoder manufacturer whether 6 wires (A, nonA, B, nonB, Supply+, 0V) is enough.
For example 1XP8032-xxx Incremental HTL encoder from Siemens:

If incremental encoder is equipped by standard M23 connector (male), then it is also possible to buy prewired cable+encoder connector (M23). For example XCCPM23121L5 is 5m prewired cable (with 10 wires) with M23 female connector for incremental encoders. Product data:
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