There should be little or no current flow in the ground wire, so a large size, while OK, is not necessary.
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?