A modern fire protection concept is immensely important during renovation of historic buildings. Working with open flames constitutes an enormous fire hazard. This doesn't just endanger the area immediately surrounding the work area – sparks from welding, cutting, and grinding can also ignite flammable materials at a distance. Although the focus of protecting a historic building is solely to preserve the structure, a fire protection system's primary aim is to protect and rescue people. This apparent conflict between protecting historic buildings and fire protection can be resolved by installing a mobile fire alarm system.