IEC 60695-2-11:2000 pdf download-Fire hazard testing – Part 2-1 1: Glowing/hot-wire based test methods – Glow-wire flammability test method for end-products.
4 Description of test considerations and test specimen selectlon If possible, the test specimen should be a complete end-product. The test specimen shall be chosen so that the conditions of the test will not be significantly different from those occurring in normal use with regard to shape, ventilation, effect of thermal stresses and, possibly, of flames occurring in, or of burning or glowing particles falling in the vicinity of, the test specimen. If the test cannot be made on a complete end-product, or unless otherwise specified by the relevant. specification, it is acceptable to a) cut a piece containing the part under examination from it, or b) cut an aperture in the complete end-product to allow the glow-wire access, or C) remove the part under examination in its entirety and test it separately. Technical committees should define in their relevant specifications what may be removed to achieve access. A small aperture may affect the results by leading to the ignition of the surroundings, by reducing the temperature of the glow-wire or by restricting the availability of oxygen，whereas too large an aperture may permit more oxygen than would normally be available. If, during the test, any part of the equipment containing the test specimen is ignited by extraneous heat from the glow-wire and so influences the thermal conditions at the test specimen, the test shall be invalid. The test is carried out to ensure that, under defined conditions, the glow-wire does not cause ignition of parts, and that a part, if ignited, has a limited duration of burning without spreading fire by flames or by burning or glowing particles falling from the test specimen. If the test specimen emits flames during the application of the glow-wire, the fire hazard created may necessitate further tests using other ignition sources such as the needle-flame applied to those parts which are reached by the emitted flames.