As with overhead glazing, there are also aspects of balcony glazing and other glazing elements that require safeguarding to prevent possible accidents. The Technical Rules for Using Accident-Proof Glazing – TRAV (Technische Regel für die Verwendung von absturzsichernden Verglasungen) stipulate the requirements to be fulfilled by the glass in the corresponding application. Generally a distinction is made between insulation glazing with a heat absorption function and pure laminated glass for accident-proof applications, e.g. balcony and loggia balustrades. In consideration of these rules, these glass elements can also be made of crystalline solar cells and integrated accordingly into the appearance and function of the building.