I am located in GA and work for a ready-mix concrete company as a Director of Safety. All of our trucks max. height is 13'3", empty or loaded. I would like to know what codes, and how are they worded, applies to overhead utility lines (including phone, cable TV, power, etc.). Does the same codes apply, per NEC and or other codes, across the country or do they change, per more restricted application, per state/county? This information would help me per questions regarding applicable codes and possible incidents.