HD 21 applies to rigid and flexible cables with insulation and sheath if any, based on polivinyl chloride, of rated voltages Uo/U up to and including 450/750 V used in power installations of nominal voltage not exceeding 450/750 V a.c. This Part 1 specifies the General Requirements applicable to these cables. The test methods specified are given in Part 2 of this HD, in HD 405.1 and in EN 60811. The particular types of cables are specified in Part 3 onwards of this HD, and are hereafter referred to as "the particular specifications". The code designations of these types of cables are in accordance with HD 361.
Registration number (WIID)
50838
Scope
HD 21 applies to rigid and flexible cables with insulation and sheath if any, based on polivinyl chloride, of rated voltages Uo/U up to and including 450/750 V used in power installations of nominal voltage not exceeding 450/750 V a.c. This Part 1 specifies the General Requirements applicable to these cables. The test methods specified are given in Part 2 of this HD, in HD 405.1 and in EN 60811. The particular types of cables are specified in Part 3 onwards of this HD, and are hereafter referred to as "the particular specifications". The code designations of these types of cables are in accordance with HD 361.
