CAN I HAVE MY CABLES AND POWER CORD IN THE SAME CONDUIT?

I GUESS THERE ARE PEOPLE WHO THINK THAT HAVING A POWER CORD IN THE SAME CONDUIT WITH OTHER CABLES (LIKE HDMI, OPTICAL, COMPONENT, ETC.) , WILL EFFECT THE PICTURE QUALITY, SIGNAL CONDITION, DATA TRANSFER CHARACTERISTICS, ETC..

I HAVE CONFIGURED SYSTEMS IN THIS WAY MANY TIMES, AND I HAVE NEVER SEEN A DIFFERENCE AND/OR HAD A COMPLAINT ABOUT IT IN ANY WAY. I HAVE EVEN HAD CABLES IN THE SAME CONDUIT WITH MULTIPLE POWER CORDS AND STILL FOUND NO VARIATION.