IEC 60708 pdf download

IEC 60708 pdf download Low-frequency cables with polyolefin insulation and moisture barrier polyolefin sheath
This standard is intended to define polyolefin-insulated cables for insertion into local outdoornetworks.
This standard is applicable to polyolefin insulated and moisture barrier polyolefin sheathedtelephone cables, filied 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.This standard is in accordance with ITU-T Recommendations.
This standard includes general design details and requirements for dimensions and otherconstructional details as well as mechanical, electrical and environmental characteristics forall types of low-frequency cables with polyolefin insulation (solid or cellular), filled or unfilled,and moisture barrier polyolefin sheath (with integral suspension strand).
2Normative references
The following referenced documents are indispensable for the application of this document.For dated references,only the edition cited applies.For undated references, the latest editionof the referenced document (including any amendments) applies.
IEC 60028,International Standard of Resistance for Copper
IEC 60189-1,Low-frequency cables and wires with PVC lnsulation and PVC sheath – Part 1:General test and measuring methods
IEC 60304,Standard colours for insulation for low-frequency cables and wires
IEC 60794-1-2，Optical fibre cables – Part 1-2:Generic specification – Basic optical cable testprocedures
IEC 60811-1-1，Common test methods for insulating and sheathing materials of electriccables – Part 1: Methods for general application – Section 1: Measurement of thickness andoverall dimensions – Tests for determining the mechanical properties
IEC 60811-1-2,Common test methods for insulating and sheathing materials of electriccables – Part 1: Methods for general application – Section Two:Thermal ageing methods
IEC 60811-1-3，Insulating and sheathing materials of electric cables – Part 1: Generalapplication – Section 3: Methods for determining the density – Water absorption tests -Shrinkage test
IEC 60811-1-4，Common test methods for insulating and sheathing materials of electriccables – Part 1: Methods for general application – Section Four – Test at low temperature
IEC 60811-5-1，Common test methods for insulating and sheathing materials of electriccables – Part 5-1: Methods specific to filling compounds – Drop point – Separation of oil -Lower temperature brittleness – Total acid number – Absence of corrosive components -Permittivity at 23 °c- Dc resistivity at 23 C and 100c
IEC 61156-1,Multicore and symmetrical pairlquad cables for digital communications – Part 1:Generic specification
ITU-T L.3,Armouring of cables
3 Quality assurance
lt is the responsibility of the manufacturer to establish quality assurance by quality controlprocedures which will ensure that the product will meet the requirements of this standard.
lt is not intended that a complete testing programme shall be carried out on every length ofconductor and cable. When the purchaser wishes to specify acceptance tests or other qualityprocedures，it is essential that agreement be reached between the purchaser and themanufacturer by the time of ordering.
4Cable construction
4.1Conductor
4.1.1Conductor material
The conductor shall consist of annealed copper,uniform in quality and free from defects. Theproperties of the copper shall be in accordance with lEC 60028.
4.1.2Type of conductor
The conductor shall consist of a single strand circular in section.The nominal diameter shallbe at least 0,4 mm.
4.1.3Conductor-finishThe conductor shall be plain.
4.1.4Continuity of conductor
Joints in the conductor are permitted provided that the tensile strength of a joint is not lessthan 90 % of the tensile strength of the unjointed conductor.