Tracked Changes. Medium power transformers 50 Hz, with highest voltage for equipment not exceeding 36 kV. Transformers with cable boxes on the high-voltage and/or low-voltage side. Cable boxes type 2 for use on transformers meeting the requirements of EN 50588-2|Testing conditions, Rated voltage, Rated frequencies, Three-phase transformers, Distribution boxes, Electrically-insulated bushings, Transformers, Electrical connections, Design, Low-voltage equipment, Junction boxes, Cable junctions, Distribution transformers, Oil-immersed transformers, Power transformers, High-voltage equipment, Boxes (electric)