IEC 61753-111-07:2021 contains the minimum tests, test severities and measurement requirements which a sealed fibre optic closure need to meet in order to be categorised as meeting the IEC standard for category A – Aerial, as defined in Table A.13 of IEC 61753‑1:2018. Free breathing closures are not covered in this document. This first edition cancels and replaces IEC 61753-111-7 published in 2009. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to IEC 61753‑111‑7:
- terms and definitions updated according to IEC 61753-1:2018 and IEC 61756-1:2019;
- detailed test severities added for UV light and fungus resistance tests of materials;
- test severities updated according to IEC 61753-1:2018;
- test overpressure for sealing tests changed to 20 kPa;
- pass-fail criterion of pressure loss during test added to mechanical sealing tests;
- laboratory test conditions harmonized with IEC 61300-1 to +23 °C ± 5 °C, unless otherwise specified;
- addition of B-657 fibre types with minimum bending radius of stored fibres according to IEC 61756-1:2019;
- vibration sealing test changed to 10 Hz, 3 mm amplitude and 1 000 000 cycles;
- reduced loads added in cable retention test for small diameter cables and tubes;
- reduced loads for cable axial compression test for small diameter cables and tubes;
- duration of the cycles in torsion and bending test added;
- free fall test removed (is covered now by the optical shock test);
- duration of the assembly and disassembly test reduced to 5 cycles;
- duration of the change of temperature reduced to 12 cycles.