electrical phase

1- I see many recommendations for dedicated power lines that they be wired out of phase from the rest of the home.
2- I also see posts touting the benefits of correct electrical phase at the component.

- is correct elec. phase truly important
- is wiring audio lines opposite of the rest of home cuurent important?

if both, then what should one do? wire the audio lines in proper phase and the rest in opposite phase? can running electrical lines out of phase cause damage to gear or appliances?

thanks,
KP