Smart buildings are particularly vulnerable to the destructive effects of thunderstorms, due to the wide variety of interconnected automatic systems (such as lighting, temperature control, multimedia systems, telecommunications, security, etc.). Therefore, any surge that penetrates the structure, not only through the power supply lines but also through the data lines, can cause damage to a multitude of sensitive electronic equipment such as computers, alarm systems, transducers, programmable logic controllers, audio-visual equipment, etc.