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IEC 60794-6-20
Edition 1.0 2020-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Optical fibre cables –
Part 6-20: Indoor-outdoor cables – Family specification for flame retardant
outdoor cables
Câbles à fibres optiques –
Partie 6-20: Câbles intérieurs/extérieurs – Spécification de famille pour
les câbles extérieurs retardateurs de flamme
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IEC 60794-6-20
Edition 1.0 2020-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Optical fibre cables –
Part 6-20: Indoor-outdoor cables – Family specification for flame retardant
outdoor cables
Câbles à fibres optiques –
Partie 6-20: Câbles intérieurs/extérieurs – Spécification de famille pour
les câbles extérieurs retardateurs de flamme
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.10 ISBN 978-2-8322-8908-2
– 2 – IEC 60794-6-20:2020 © IEC 2020
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviated terms . 7
4 General specifications . 7
4.1 Optical fibres . 7
4.2 Cable elements . 7
5 Specifications for flame retardant outdoor cables – Construction . 8
6 Details of family specifications and test conditions for flame retardant outdoor
cables. 8
6.1 Applicable tests . 8
6.2 Mechanical tests . 9
6.2.1 General . 9
6.2.2 Tensile performance . 10
6.2.3 Abrasion . 10
6.2.4 Crush . 11
6.2.5 Impact . 11
6.2.6 Repeated bending . 11
6.2.7 Torsion . 12
6.2.8 Bend . 12
6.2.9 Bending under tension . 12
6.2.10 Kink . 12
6.2.11 Rip cord functional test . 12
6.3 Environmental tests . 13
6.3.1 Temperature cycling . 13
6.3.2 Water penetration . 13
6.3.3 Ageing . 14
6.3.4 UV resistance . 14
6.3.5 Environmental stress cracking . 14
6.3.6 Cable external freezing . 14
6.3.7 Compound flow . 15
6.3.8 Bleeding and evaporation . 15
6.3.9 Material compatibility . 15
6.4 Cable element tests . 15
6.4.1 Ribbon strippability . 15
6.4.2 Ribbon tear (separability) . 15
6.4.3 Ribbon dimensions and geometry . 16
6.4.4 Ribbon torsion . 16
6.4.5 Ribbon residual twist . 16
6.4.6 Tube kinking . 16
6.4.7 Bend test for optical cable elements . 16
6.4.8 Stripping force stability of cabled fibres . 16
6.5 Other tests . 17
6.5.1 Fire performance . 17
6.5.2 Electrical continuity of cable metallic elements . 17
6.5.3 Thickness of non-metallic sheath . 17
6.5.4 Overall dimensions . 17
Annex A (informative) Examples of flame retardant (FR) outdoor cables . 19
Bibliography . 20
Figure A.1 – Example of a stranded FR outdoor cable design . 19
Figure A.2 – Example of an FR outdoor cable with a central tube design . 19
Table 1 – Tests applicable for mechanical and environmental performance of flame
retardant outdoor cables . 8
Table 2 – Low and high temperatures . 13
– 4 – IEC 60794-6-20:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRE CABLES –
Part 6-20: Indoor-outdoor cables –
Family specification for flame retardant outdoor cables
FOREWORD
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