电缆材质燃烧产生气体检测.第2部分:酸度(通过测量pH值)和导电性的测定

[中文适用范围]： 本部分规定了通过测量由电缆或光缆材料燃烧产生的气体溶于水溶液后的酸度（pH）和电导率，来确定该气体潜在腐蚀性的 apparatus 和 procedure。本标准规定的一般方法旨在测试构成电缆的单个组件，并提供了计算电缆中组合材料加权值的方法。该方法可用于验证电缆规格中规定的单个组件或组合组件的相关要求。本部分还包含一种简化方法，用于在质量控制过程中仅需证明符合既定性能要求的单个组件测试。 [外文原描述]： IEC 60754-2:2011 specifies the apparatus and procedure for the determination of the potential corrosivity of gases evolved during the combustion of materials taken from electric or optical fibre cable constructions by measuring the acidity (pH) and conductivity of an aqueous solution resulting from the gases evolved during the combustion. The general method specified in this standard is intended for the testing of individual components used in a cable construction. Formulae are given for the calculation of a weighted value for a combination of materials found in a specified cable. The use of this method will enable the verification of relevant requirements for either individual components or combined components of a cable construction stated in the appropriate cable specification. A simplified method is included for the testing of individual components where it is required only to demonstrate compliance with a stated performance requirement for quality control purposes. The significant technical changes with respect to the previous edition are as follows: - improved definition of safety requirements relating to capture of gases; - introduction of guidance on the preparation of test specimens for more even combustion; - better expression of tolerances and precision; - clarification of the conductivity and acidity functions; - improved definition of the heating procedure; - greater precision in the definition of the test temperature for the determination of pH value and conductivity; - correction of the formulae for the calculation of the test results.