IEC 62420:2008

FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
4 Designation system
5 Requirements for stranded conductors
  5.1 Material
  5.2 Conductor sizes
  5.3 Surface
  5.4 Stranding
      5.4.1 General
      5.4.2 Lay ratio for core wires
      5.4.3 Lay ratio for aluminium layer(s)
      5.4.4 Joints
      5.4.5 Linear mass
      5.4.6 Conductor strength
6 Tests
  6.1 Classification of tests
  6.2 Type Tests
      6.2.1 Length of sample required
      6.2.2 Joints in aluminium wires
      6.2.3 Annular gap(s)
      6.2.4 Stress-strain curves
      6.2.5 Breaking strength of conductor
      6.2.6 Creep curves
  6.3 Sample tests
      6.3.1 Cross-sectional area
      6.3.2 Overall diameter
      6.3.3 Linear mass
      6.3.4 Surface condition
      6.3.5 Lay ratio and direction of lay
      6.3.6 Breaking strength of wires after stranding (if
            requested)
      6.3.7 Wire canting on the outside layer (if requested)
7 Inspection
  7.1 Test location
  7.2 Acceptance or rejection
8 Packaging and marking
  8.1 Packaging
  8.2 Marking and tare
  8.3 Random lengths
Annex A (normative) Information to be supplied by purchaser
Annex B (normative) Stress-strain test method
Annex C (normative) Nominal mass of grease for stranded
        conductors
Annex D (informative) Alternate method of measuring the gap(s)
        within the conductor
Annex E (informative) Recommended conductor sizes and
        tables of conductor properties

IEC 62420:2008 specifies the electrical and mechanical characteristics of concentric lay stranded overhead electrical conductors, containing one or more self-supporting alumimium or aluminium alloy layer(s) made of combination of any of the following metal wires:
- Hand drawn aluminium as per IEC 60889, designated A1;
- aluminium alloy type A or B as per IEC 60104, designated A2 or A3;
- thermal resistant aluminium alloy as per IEC 62004, designated AT1, AT2, AT3, or AT4;
- regular strength steel as per IEC 60888, designated S1A or S1B;
- high strength steel as per IEC 60888, designated S2A or S2B;
- extra-high strength steel as per IEC 60888, designated S3A;
- aluminium-clad steel as per IEC 61232, designated 20SA, 27SA, 30SA or 40SA.