AS NZS IEC-60331-2-2017 pdf download.Test on gases evolved during combustion of materials from cables Part 1 : Determination of the halogen acid gas content.
This part of IEC 60754 specifies the apparatus and procedure for the determination of the amount of halogen acid gas, other than hydrofluoric acid, evolved during the combustion of compounds based on halogenated polymers and compounds containing halogenated additives taken from electric or optical fibre cable constructions.
NOTE 1 This test method is not able to determine hydrofluoric acid. A suitable method may be found in IEC 60684-2.
NOTE 2 This test method may be used to test materials to be used in cable manufacture, but a declaration of cable performance should not be made based on such a test.
NOTE 3 The relevant cable standard should indicate which components of the cable should be tested.
NOTE 4 For the purposes of this standard, the term “electric cable” covers all insulated metallic conductor cables used for the conveyance of energy or signals.
The method specified in this standard is intended for the testing of individual components used in a cable construction. The use of this method will enable the verification of requirements which are stated in the appropriate cable specification for individual components of a cable construction.
NOTE 5 By agreement between the producer and purchaser, the methodology given in this standard may be used to test combinations of materials representing a cable construction, but a declaration of cable performance to this standard should not be made based on such a test. Information on such a method is given in Annex A.
For reasons of precision this method is not recommended for reporting values of halogen acid evolved less than 5 mg/g of the sample taken.
2 Normative 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 edition of the referenced document (including any amendments) applies.
ISO 385, Laboratory glassware – Burettes
ISO 1 042, Laboratory glassware – One-mark volumetric flasks
ISO 3696, Water for analytical laboratory use – Specification and test methods
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 halogen acid gas content
amount of halogen acid gas evolved, except hydrofluoric acid, expressed as milligrams of hydrochloric acid per gram of total test specimen
Test method principle The material under test shall be heated in a stream of dry air and the gases shall be absorbed in 0,1 M sodium hydroxide solution contained in wash bottles. The amount of halogen acid shall then be determined by acidifying the solution with nitric acid, adding a measured volume of 0,1 M silver nitrate solution and back titrating the excess with 0,1 M ammonium thiocyanate, using ferric ammonium sulphate as the indicator. NOTE 1 Other analytical methods having at least the same precision may be used, but in case of dispute the method given in this standard is the one to use. NOTE 2 Although both hydrogen chloride and hydrogen bromide are detected by this analytical method, the halogen acid content is reported as if all the halogen acid is hydrogen chloride.
5 Test apparatus
5.1 General The apparatus is shown in Figures 1 to 5. The assembly of the components which constitute the test apparatus shall be leak-tight. The connecting distances between the quartz glass tube and the first bottle and between subsequent bottles shall be as short as possible. Glass or silicone rubber tubing shall be used for these connections.AS NZS IEC-60331-2 pdf download.