You should be good to go at 2', particularly if the cabinent of your breaker box is made from steel. If you want more shielding, any steel that a magnet sticks to will work.
With industrial equipment, you sometimes see conductors or busswork carrying hundreds or thousands of amps located within your 2' of computer equipment and/or very sensitive low level input signal terminations. Stay away from running stereo cables in parallel with current carrying conductors & you should be fine.
With industrial equipment, you sometimes see conductors or busswork carrying hundreds or thousands of amps located within your 2' of computer equipment and/or very sensitive low level input signal terminations. Stay away from running stereo cables in parallel with current carrying conductors & you should be fine.