Dear Muhammed, thank you very much for your question! I believe you are talking about the security of the people installing infrastructure. Please, let me know if that is not the case.
Specially when going up towers, people should wear the appropriate gear (working boots, helmet, climbing harness etc). Those supporting from the bottom of the tower should also wear helmets as well, as even a small screw falling from the top of a tower could cause fatal injuries. This gear is not at all expensive when compared to the cost of the tower itself, and should be factored in when costing the tools needed for installation.