IEC 60708 : 1.0

LOW-FREQUENCY CABLES WITH POLYOLEFIN INSULATION AND MOISTURE BARRIER POLYOLEFIN SHEATH

International Electrotechnical Committee

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FOREWORD
1 Scope
2 Normative references
3 Quality assurance
4 Cable construction
  4.1 Conductor
       4.1.1 Conductor material
       4.1.2 Type of conductor
       4.1.3 Conductor-finish
       4.1.4 Continuity of conductor
  4.2 Insulation
       4.2.1 Insulation material
       4.2.2 Insulation thickness
       4.2.3 Colour of insulated conductor
  4.3 Cabling element
  4.4 Stranding
  4.5 Colour code
       4.5.1 General
       4.5.2 Sub-units, units and cables up to and including
              100 pairs or 100 quads
       4.5.3 Cables of more than 100 pairs or 100 quads
  4.6 Spare pairs or quads
  4.7 Filling
  4.8 Core protection
  4.9 Sheath
       4.9.1 Sheath material
       4.9.2 Application of the sheath
  4.10 Cable protection
  4.11 Finished cable
       4.11.1 Overall diameter
       4.11.2 Sheath marking
       4.11.3 Sealing of ends
  4.12 Delivery
5 Mechanical requirements
  5.1 Conductor
  5.2 Insulation
  5.3 Sheath
       5.3.1 Tensile strength and elongation
       5.3.2 Adhesion of aluminium tape to the polyethylene
       5.3.3 Adhesion of aluminium tape at the overlap
  5.4 Finished cable
       5.4.1 Sheath integrity
       5.4.2 Resistance to water penetration
       5.4.3 Cable drip
6 Thermal stability and environmental requirements
  6.1 Insulation
       6.1.1 Thermal oxidative stability (OIT-test)
       6.1.2 Shrinkage
       6.1.3 Wrapping test of insulation after thermal aging
       6.1.4 Bending test at low temperature
  6.2 Sheath
       6.2.1 Elongation at break after ageing
       6.2.2 Resistance to weathering
       6.2.3 Resistance to environmental stress cracking
7 Electrical requirements
  7.1 General
  7.2 Electrical resistance of conductor
  7.3 Electrical resistance unbalance
  7.4 Dielectric strength
  7.5 Insulation resistance
  7.6 Mutual capacitance
  7.7 Capacitance unbalance
  7.8 Transmission characteristics (when used for digital
       communication)
       7.8.1 Attenuation
       7.8.2 Near End Crosstalk (NEXT)
       7.8.3 Equal Level Far-end Crosstalk (ELFEXT)
       7.8.4 Power sum (PS) of crosstalk loss
       7.8.5 Characteristic impedance
       7.8.6 Velocity of propagation
Annex A (normative) Colour code: 10 pair or 5 quad count
Annex B (normative) Colour code: sub-unit identification for
                    50 pair (25 quad) and 100 pair (50 quad)
                    cables or units, using 10 pair or 5 quad
                    count
Annex C (normative) Colour code: 25 pair count
Annex D (normative) Colour code: unit identification for
                    50 pair or quad and 100 pair or quad
                    cables or units, using 25 pair or quad
                    count
Annex E (normative) Colour code: 25 quad count
Annex F (normative) Colour code: unit identification for
                    cables with more than 100 pairs, 25 pair
                    count
Annex G (normative) Colour code: unit identification for
                    cables with more than 100 pairs or 50 quads,
                    using 10 pair or 5 quad count or 25 quad
                    count

Abstract

Defines polyolefin-insulated cables for insertion into local outdoor networks. It is applicable to polyolefin insulated and moisture barrier polyolefin sheathed telephone cables, filled or unfilled with copper conductors, and used as: a) Cables suitable for installation in ducts. b) Cables suitable for direct burial in the ground. c) Cables with integral suspension strand for aerial installations.