IEC 60754-1-2019 pdf free download

IEC 60754-1-2019 pdf free download.Test on gases evolved during combustion of materials from cables — Part 1: Determination of the halogen acid gas content
Essal sur les gaz émis lors de Ia combustion des matériaux prélevés sur cables — Partie 1: Determination de Ia quantité de gaz acide halogene.
7.3.1 DetermInation of heating regime
The empty combustion boat shall be inserted into the quartz glass tube and placed approximately in the centre of the tube furnace.
The flow rate of air shall be adjusted by means of a needle valve to the value specified in 5.6 and shall be kept constant during the determination.
Position a thermocouple, or other suitable temperature measuring device (suitably protected against corrosion), at the test specimen point in the empty combustion boat. The combustion boat shall be heated at an approximately uniform heating rate over a period of (40 ± 5) mm in order to raise the temperature recorded by the thermocouple to (800 ± 10) °C. after which it shall be maintained at that temperature for (20 ± 1) mm.
Determine from this procedure a heating regime which will ensure that the required test specimen heating rate and temperature is achieved.
7.3.2 Test specimen heating procedure
The combustion boat containing the test specimen shall be inserted into the quartz glass tube and placed approximately in the centre of the tube furnace.
The flow rate of air shall be adjusted by means of a needle valve to the value specified in 5.6 and shall be kept constant during the test.
The test specimen shall be heated using the heating regime determined in 7.3.1.
WARNING The operator should take precautions. eg. the wearing of eye protection and suitable protective clothing, because certain materials Ignite quickly, and can cause “blow back” of hot gases. Care should also be taken to avoid over-pressurization of the system. and to allow for venting of exhaust gases. Guidance on the avoidance of blow back is given In NOTE 2 of 5.1.IEC 60754-1-2019 pdf free download.