This HD 603 applies to cables of rated voltage Uo/U = 0.6/1 kV used in underground power distribution systems mainly for public distribution, of nominal voltage not exceeding 0.6/1 kV A.C. This part (Part 1) specifies the general requirements applicable to these cables, unless otherwise specified in the particular sections of this HD. Test methods are specified in HD 605 and in HD 383, HD 405 and HD 505. The particular types of cables are specified in Parts 3 to 8.