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IEC TR 62959
Edition 1.0 2021-02
TECHNICAL
REPORT
colour
inside
Optical fibre cables – Shrinkage effects on cable and cable element end
termination – Guidance
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IEC TR 62959
Edition 1.0 2021-02
TECHNICAL
REPORT
colour
inside
Optical fibre cables – Shrinkage effects on cable and cable element end
termination – Guidance
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.10 ISBN 978-2-8322-9434-5
– 2 – IEC TR 62959:2021 IEC 2021
CONTENTS
FOREWORD . 7
INTRODUCTION . 9
1 Scope . 10
2 Normative references . 10
3 Terms and definitions . 10
4 Abbreviated terms . 11
5 Characteristics of optical fibre cables . 11
5.1 General . 11
5.2 Cable materials . 11
5.2.1 Plastic materials . 11
5.2.2 Reversible thermal expansion and contraction . 11
5.2.3 Irreversible thermal contraction (shrinkage) . 12
5.2.4 Forces between cable elements caused by thermal changes . 13
5.3 Cable design . 13
5.4 Basic cable types . 14
5.5 Cable performance . 15
5.5.1 General . 15
5.5.2 Optical performance during temperature changes . 15
5.5.3 Cable shrinkage characteristic . 16
5.5.4 Cable shrinkage during connector termination process . 16
6 Test methods for cable shrinkage . 17
6.1 General . 17
6.2 Conditions before shrinkage testing . 17
6.3 Test method F11 . 17
6.4 Test method F17 . 18
7 Conclusions of the cable shrinkage study . 19
7.1 General . 19
7.2 Conclusion for simplex cables . 19
7.3 Conclusion for loose tube cables . 20
8 Termination cases of optical fibre cables . 20
8.1 General . 20
8.2 Different termination cases . 20
9 Recommended tests for evaluation of shrinkage effects . 21
9.1 General . 21
9.2 Limitation of tests for determination of shrinkage effects . 22
9.3 Cables terminated with connectors. 22
9.3.1 Performance indicator tests . 22
9.3.2 Cable shrinkage . 22
9.3.3 Cable thermal expansion and contraction . 22
9.3.4 Cable element forces . 22
9.4 Cables terminated with hardened connectors . 22
9.4.1 Performance indicator tests . 22
9.4.2 Cable shrinkage (fibre protrusion) . 23
9.5 Cables fixed into a module and fibres terminated with connectors . 23
9.5.1 Performance indicator tests . 23
9.5.2 Cable shrinkage (fibre protrusion) . 23
9.6 Cables fixed into a divider and fan-out cables terminated with connectors . 23
9.6.1 Performance indicator tests . 23
9.6.2 General . 24
9.6.3 Shrinkage (fibre protrusion) . 24
9.6.4 Shrinkage of fan-out cable . 24
9.7 Cables fixed into a protective housing and terminated with splices . 25
9.7.1 Performance indicator tests . 25
9.7.2 Cable shrinkage (fibre protrusion) . 25
9.7.3 Sheath shrinkage . 25
9.8 Cables fixed into a protective housing and terminated with connectors . 25
9.8.1 Performance indicator tests . 25
9.8.2 Cable shrinkage . 25
10 Recommended test parameters for shrinkage testing and shrinkage grades . 26
10.1 General . 26
10.2 Recommended test parameters for shrinkage testing . 26
10.3 Shrinkage grades for Method F11A . 27
10.4 Recommended shrinkage limit for Method F11B. 27
10.5 Fibre protrusion grades for Method F17 . 27
Annex A (informative) Test results of the cable shrinkage study . 29
A.1 General . 29
A.2 Shrinkage test results of simplex cables . 29
A.2.1 Simplex cable types for shrinkage tests . 29
A.2.2 Shrinkage test with different aging methods and duration . 29
A.2.3 Shrinkage test with various numbers of temperature cycles . 33
A.2.4 Shrinkage test with different sample lengths . 34
A.2.5 Shrinkage test versus optical performance of two different simplex
cables . 34
A.2.6 Shrinkage test versus optical performance of different versions of a
simplex cable . 36
A.2.7 Change in length during and after climatic exposure . 36
A.3 Shrinkage test results for loose tube cables . 37
A.3.1 Loose tube cable types for shrinkage tests . 37
A.3.2 Shrinkage test (method F11 modified) of four loose tube cable types . 37
A.3.3 Shrinkage test (method F17) of four loose tube cable types . 39
A.3.4 Shrinkage test of nine unitube cable types . 43
Annex B (informative) Test method for change in length during climatic exposure . 45
B.1 General . 45
B.2 Cable samples . 45
B.3 Apparatus for determination of the change in length . 45
B.4 Procedure for determination of the change in length . 46
B.5 Test results for the change in length . 46
B.6 Procedure for determination of the change in attenuation. 47
B.7 Test results for the change in attenuation . 47
B.8 Comparison of change in length with change in attenuation . 50
B.9 Conclusion . 51
Annex C (informative) Shrinkage testing template . 52
Annex D (informative) Recommended tests for performance evaluation of cables to
be terminated with connectors . 53
D.1 General . 53
– 4 – IEC TR 62959:2021 IEC 2021
D.2 Connector types and design . 53
D.3 Simplex and duplex cable types . 55
D.4 Termination of a cable to a connector . 56
D.5 Overview of recommended cable tests . 57
D.6 Main performance of a terminated cable . 57
D.7 Guidance for change of temperature test methods .
...