EN 50268：在燃烧条件下电缆通用测试方法－在规定条件下电缆燃烧烟密度测量
EN 50268：Common Test Methods for Cables under Fire Conditions - Measurement of Smoke Density of Cables Burning under Defined Conditions
Abstract摘要
The test is performed inside a chamber measuring 3 metres by 3 metres by 3 metres and the test is sometimes referred to as the three metre cube test.
The number of lengths and the mounting arrangement of the cables is dependant upon its outer diameter. Once the specimens have been bundled as required, they are placed onto the specimen stand and an alcohol fuel source is placed below the test specimen. At
the start of the test the fuel is ignited.
The test is performed by monitoring the transmittance reduction of a white light beam, running from one side of the chamber to the other at a set height, thus monitoring the build up of smoke inside the chamber. A small fan is utilised inside the chamber to prevent the smoke building up in a layered effect and a draft screen is utilised to protect the specimen and the flame source from any wind turbulence. The test duration is 40 minutes.
