This standard specifies general requirements for switch cabinets for fixed generators less than 12 kVA in fire-brigade vehicles in accordance with the standard series EN 1846 and with DIN 14555-3. Switch cabinets type AA and type BB are devices which are used for the connection of electrical loads with voltages up to 400 V (DC three-phase current) maximum. The switch cabinets contain all required protective equipments. In addition this document specifies the minimum necessary requirements for control and monitoring elements.