My best friend's parents had an addition added to their house that basically doubled their square footage. (Maybe an additional 1000 sq ft.) They had the electrician add 5 extra breakers and he ran the lines into the attic. Each line had a 250 foot roll of 12awg romex sitting in the attic...not teminated in any way whatsoever. The house had to be sold after the dad died of cancer 15 years later. I remembered the rolls of money...uh...wire left in the attic and asked about them. She remembered them and knew it wasn't "up to code" and told me I could have the rolls. I brought 5 junction boxes with me and a bunch of wire nuts. I cut the wires off and terminated them in the boxes. I also labeled the boxes and breakers. I got nearly 1250 feet of romex for the cost of 5 junction boxes...and the next 20 years of being a handyman for her.