Joey...For the record....That's an attack from you LOL gotya on this one. I know you are smart enough to figure that table above...just concentrate on Circuit 3...with the VD measured under 250W & 290W...that's the 13 V Tap.... It is about the principal and advantages to connect two parallel runs - if you can - like when you have runs on each side of a walkway and a chase already installed by others under the walkway at the end...wouldn't you do it after seeing these measurments ??...Hell my VD decreased by at least 2/3 !!!. Let me put the numbers below so it is easier to see: 12 AWG, 100ft. run, 250 W ====> VD with single run = 6.67 I got 1.7 12AWG, 100ft. run, 290W ====> VD with single run = 7.73 I got 2.1 Again this is not intended to offend any other way to make a system work.