The box is made of polystyrene, a self-extinguishing plastic which provides corrosion free, highly impact resistance, stable and maintenance free use. All installation parts, such as cable entries, cable fixing rings and wire guide rings are moulded. These distribution boxes are de- signed for indoor application with protection class IP 30 according to DIN 40050. Flammability class UL 94V-0 and colour RAL 7035 with fully assembled.