IEC 60811-404-2012 pdf free download

IEC 60811-404-2012 pdf free download.Electric and optical fibre cables – Test methods for non-metallic materials – Part 404: Miscellaneous tests – Mineral oil immersion tests for sheaths.
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60811-100:2012, Electric and optical fibre cables — Test methods for non-metallic materials — Part 100: General
IEC 60811-501. Electric and optical fibre cables — Test methods for non-metallic materials — Part 501: Mechanical tests — Tests for determining the mechanical properties of insulating and sheathing compounds
ISO 1817, Rubber, vulcanized — Determination of the effect of liquids
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60811-100 apply.
4 Test method
4.1 General
This Part of IEC 60811 shall be used in conjunction with IEC 60811-100.
Unless otherwise specified, tests shall be carried out at room temperature.
4.2 Pre-conditioning
All the tests shall be carried out not less than 16 h after the extrusion or cross-linking, if any.
of the sheathing compounds.
4.3 Sample and test piece preparation
Five test pieces shall be prepared In accordance with the procedures described in
IEC 60811-501.
4.4 Determination of the cross-sectional area of the test piece See the test method in IEC 60811-501.
4.5 Oil to be used
Unless otherwise agreed, the mineral oil to be used shall be oil no. 2 (IRM 902) as described
in ISO 1817.
4.6 Procedure
The test pieces shall be immersed in the oil bath, previously heated to the specified test temperature, and shall be maintained in the oil at that temperature for the specified time (see standard for the type of cable).
At the end of the specific duration, the test pieces shall be removed from the oil, blotted lightly to remove excess oil and suspended in air at ambient temperature for at least 16 h but not more than 24 h, unless otherwise specified in the relevant cable standard. At the end of this period, any further excess oil shall be removed by lightly blotting the test pieces.
4.7 Determination of mechanical properties See the test method in IEC 60811-501.
4.8 Expression of results
The calculation of tensile strength shall be based on the cross-sectional area of the test piece measured before immersion (see 4.2.2).
The difference between the median value obtained on the five test pieces immersed in oil and the median value of the values obtained for the untreated test pieces (see IEC 60811-501). expressed as a percentage of the latter, shall not exceed the percentage specified in the standard for the type of cable.IEC 60811-404 pdf free download.