Dedicated Line, Surge and Safety

Jack, many electricians will tell you that it is overkill. I beleive the electrical code for a 20A line only calls for 12 gauge. However, if anything, it should be safer with 10 gauge. Since the circuit breaker will determine how much juice is sent down the line. Look at it this way, you're installing a 4 lane highway where code only requires 2 lanes. So it should be safer. The breaker guarantees that more traffic won't be sent along just because you widened the road.

Jdombrow, very funny. I figured if he wanted factual information, he'd just listen to his electrician, whom I simply agreed with. I guess I should have simply said to listen to his electrician.
I am not an electrician, but I did sleep at a Holiday Inn last night. Seriously though, I do know a few, and they all will say that 10 gauge is overkill. Meaning you can get away with thinner wire (12 gauge), safely and legally and cheaper. Most folks associated with audio choose for overkill though. Many of us could get by with cheaper and thinner cables in our systems. I had to fight with my electrician to get 10/3 wire, he's a friend who was hell bent on saving me a couple bucks. He simply thought going from 12/3 to 10/3 was a waste of money. When I told him how much my power cords cost, he rolled his eyes and gave in.

Timo- Rex is correct, 10/2 actually has 3 conductors, they don't count the ground conductor. So 10/3 would have 4 conductors.