Benny, I think those figures you got are a bit conservative, I gather the encoders are open collector A & B only (not differential). If they are open collector you may need a pull-up resistor unless the Rutex have ( you need to know the Rutex encoder input details).
But either way, if you make sure you use shielded cable and ground the shield at the control end and run the cables separate to motor power, you will probabally get away with 3m or more. Often, open collector means you can run higher encoder voltage than 5v possibley 12v or 24v making them more immune to noise pick up, but that would be usually dictated by the controller.
Al


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