Small gauge ground wire, is it OK?


bought Audio Magic's Sorcerer 4D cable in bulk to make separate runs from my breaker box directly to the components. When I opened the ends of the Audio Magic cable there two big conductor lines separately insulated inside the foil shield. Each insulated bundle has 4 wires inside and should be around 6-8AWG in total. But to my suprise, there wasn't any ground wire visible, except a single run of a 20AWG insulated wire. I asked about it to Cable Company where I purchased the cable and they asked to Audio magic about this and they confirmed that small gauge wire is to be used as Ground. Somehow I'm a bit worried because I've always known and seen Ground wires to be around the same gauge of current carrying wires. Is this OK to use?
muratc
There should be little or no current flow in the ground wire, so a large size, while OK, is not necessary.
This "cable" doesn`t meet electrical code. In case of a fire, not only won`t you collect a thin dime from insurance, you`re 100% liable. Where`d you get this 1/2 brained idea?
Where`d you get this 1/2 brained idea?
[Porziob]

http://www.audio-magic.com/Prod-Sorcerer4D.html

You would be surprised how many cable companies out there are selling home made power cords, cables, that are not UL listed. Making your own is one thing, but selling them is another.