Reply to "What size wire?"

I went to Home Depot and bought rolls of 14 gauge wire.  I have two loops and used Red for one loops center rail and Orange for the other.  I used Black for both grounds.  I used FasTrack and attached the wire using the terminal connectors.  I dropped both wires through a hole and connected the wires to a terminal block.  I used a barrel connector to extend the wire to the terminal block.  I used a CMB4/10 terminal block.  This allowed 19 wires to connect from the track and one to connect to another block or to the transformer.  I did one loop at a time so I didn't get the ground wires mixed up.  I posted information about the CMB4 on another post.