How close can the wires be ? - Advice needed.

Greetings,

How far away from a 230 vac spindle motor do you have to keep a
shielded encoder wire? or dont you have to worry about it.
Can you zip tie a servo motor output wire and its encoder wire
together or is this a bad practice.I'm concerned about noise
and crosstalk and such. Generally speaking how far should I keep
AC wiring from DC step and dir. wires, encoder wires etc.

Thanks
Jeff