Install A Dedicated AC Line at home

Following the recommendations of many a HiFi Guru, I’ve hired an licensed electrician to run 30 amp circuits with 10 gauge wire for my stereo gear. I told him I’d supply the PS Audio PowerPort Classic Outlets (I believe these are similar to the JPS Labs outlets shown above.)

Here’s my question — the electrician tells me that he connects a “tail” of 12 gauge wire to the heavier 10 gauge wire on the outlet end, making it easier to connect to the outlet. 

To my mind (a complete electrical newbie), this sounds like it defeats the purpose of installing the 10 gauge wire — to bring more robust electrical power from the circuit to the outlet to the stereo equipment. 

Can those of you who have more experience in this area share your wisdom so I don’t end up with a botched installation?

Thanks much.

Michael 

Thanks everyone for your helpful comments — I’ll study them carefully before proceeding. 
 

In reading over the comments, it became apparent to me that I had a typo in my original post. My intent was for the electrician to install a total of 4 dedicated 20 AMP circuits with 10 gauge wiring — one for each of the JC1 amps (2 total), 1 for the AV equipment at the front of the room, and 1 for the HiFi source equipment at the back of the room. I think that addresses the very valid concerns from the first response post. 
 

Thanks again for everyone’s suggestions. 

Hey Guys

Another question about installing dedicated 10 gauge wiring for my audio system. Is it necessary to run 10 gauge for all equipment (pre-amps, phono, phono amps, CD player, etc.) or just my mono block amplifiers? 

Thanks.