This standard covers the oil-immersed single-phase connection assembly of cables for transformers and reactors, designed in accordance with EN 60076 series and with EN 60289, respectively. NOTE In the standard the term "transformer" is used as common definition for transformer and reactor. The purpose of EN 50299 is to establish for the cable assemblies: the electrical and mechanical requirements, including interchangeability; the limits of supply; the test to be carried out. It complements and amends, if necessary, the relevant IEC standards and applies to oil immersed cable connections, suitable for fluid-filled or dry-type cable terminations. EN 50299 does not cover direct cable terminations (see 3.3.3), but, in this case, upon agreement between purchaser and supplier, the standard may be used for guidance except for Figure 1 and Figure 2 which are not applicable. This standard applies to oil-immersed cable connection boxes on transformers with highest voltage for equipment Um