Shielding AV cables from mains?

["garygfx" <garygfx@xxxxxxx>]

What's the best way to shield a run of video, audio and telephone 
cables when theypass over a mains cable please?

I'm running these wires through my garage and they have to pass over 
the mains cable that comes in from the street and up the garage wall. 
The cables literally touch the mains but there's enough room to slip 
some shielding inbetween at the crossover point. Would wrapping foil 
around the AV cables help? I'm trying to prevent hum and other 
interference.

Yours cluelessly,
Gary.

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