I have 2 large chambers running from my basement to my attic. Each one is less than half filed by the soil stacks of my sewer lines. The other half is just open space. Can I run wires (low voltage or high voltage) through this chamber? Would this be against any codes? Is there any reason (other than that last question) why I would not want to do this? A previous owner seems to have run some electric lines through it already. Is this OK?