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IEC 60754-1-2011 pdf free

IEC 60754-1-2011 pdf free.Test on gases evolved during combustion of materials from cables – Part 1: Determination of the halogen acid gas content.
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 1042. 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 halogen acid gas content amount of halogen acid gas evolved, except hydrofluoric acid, expressed as milligrams of .
4 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.
NOTE 1 At the exit side of the quartz glass tube. as close to the end as possible, it Is permitted to place a plug of silica wool to aid collection of condensates.
NOTE 2 A third empty bottle, of the same size as the gas washing bottles, placed before the gas washing bottles. may be used to improve safety. i.e. to prevent suck back of water into the quartz glass tube.
5.2 Tube furnace
The length of the heating zone of the furnace shall be within the range 480 mm to 620 mm, and its inside diameter shall be within the range 38 mm to 62 mm. It shall be equipped with an adjustable electrical heating system.
5.3 Quartz glass tube
For the test, a quartz glass tube shall be introduced into the tube furnace. The tube shall be approximately concentric to the furnace. It shall be resistant to the action of corrosive gases.
The inside diameter of the tube shall be within the range 30 mm to 46 mm. The tube shall protrude on the entrance side of the furnace by a length of between 60 mm to 200 mm, and on the exit side by between 60 mm to 100 mm. The initial clearance shall allow for thermal expansion. For the purposes of measurement of the protrusion distances, the tube shall be regarded as that part of essentially constant diameter.IEC 60754-1 pdf download.

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