Dedicated circuit question

I will be having an electrician install a dedicated circuit for my listeneing room in a few weeks. This will be for two channel only. I have a pair of Bel Canto ref500m's, Aesthetix Calypso pre and an Ayre CX-7eMP as a source. Should I get two lines? One for the power amps and one for the pre and CDP? Or do I really need three to keep the digital source seperate? Help please!