The only short answer to this question is: it is always advisable to install a lightning rod to protect people and buildings against atmospheric electrical discharges. However, the requirements for this protection vary according to a wide range of parameters, such as the lightning density in the area, the dimensions of the structure, its use or the material from which it is made. For this reason, lightning protection standards include a risk calculation which, in some countries, is incorporated into regulations that make this analysis mandatory. In addition, the unpredictability of the phenomenon and its high destructive power mean that, in certain circumstances and according to some local regulations, installation changes from being advisable to being compulsory. In any case, the installation of a lightning protection system (LPS) requires the specific technical method for the correct design of that system to be followed, in accordance with the applicable standards.