Hi, I need to install a lightning system (externally) to a four old buildings (see image lagoon.jpg) around 150 feet tall near to an international airport in Dade County (Miami FL) I'm planning to strap the wires from the roof down to the ground rods by using the building external walls, also there are like 60 A/C units on the roof and I would like to know where ton the NEC or NFPA show the minimum size of wire that can be use to bod adjacent metal objects to the lightning system, here is a few images so you guys can help me with ideas and recommendations. Thank you