scope:

EN 50266 specifies methods of test for the assessment of vertical flame spread of vertically-mounted bunched wires or cables, electrical or optical, under defined conditions. The test is intended for type approval testing. The requirements for the selection of cables for testing are given in annex A. The flame spread is measured as the extent of damage of the cable sample. This procedure may be used to demonstrate the cable's ability to limit flame spread. This Part 2-2 covers Category A and relates to cables installed on the test ladder to achieve a nominal total volume of non-metallic material of 7 litres per metre of test samples. The flame application time is 40 min. This method of mounting uses the front of the ladder, a standard or wide ladder being used for cables having a conductor cross-section greater than 35 mm2 according to the number of test pieces required, and a standard ladder for conductor cross-sections 35 mm2 and smaller. The category is intended for use with small cables where high volumes of non-metallic material are required to be evaluated. A recommended performance requirement is given in annex B.