Rung support plates to increase the contact surface for the cables in the molded parts for the installation types with cable ladders for functional integrity in accordance with DIN 4102 Part 12. To ensure that the functional integrity cables have as large a contact surface as possible in the cable ladder molded parts in the event of a fire, the rung support plates must also be used. The rung support plates are only placed loosely on the rungs of the cable ladder molded parts. The noses designed downwards prevent slipping.