This part of ISO 6722 specifies the dimensions, test methods, and requirements for single-core 60 V cables intended for use in road vehicle applications where the nominal system voltage is ? (60 V d.c. or 25 V a.c.). It also specifies additional test methods and/or requirements for 600 V cables intended for use in road vehicle applications where the nominal system voltage is greater than ? (60 V d.c. or 25 V a.c.) to ? (600 V d.c. or 600 V a.c.). It also applies to individual cores in multi-core cables. This part of ISO 6722 specifies requirements for copper conductor cables.