- Creato: Lunedì, 12 Novembre 2012 14:41
- Ultima modifica: Lunedì, 21 Ottobre 2019 17:22
- Pubblicato: Lunedì, 12 Novembre 2012 14:41
Are the product and its circumstances of use compatible with test settings from the scenario?
Whether the focus of assessment is a product or a system, typically the most important fire scenario characteristics will be those that either define the fire conditions that cause the product to become involved in fire, or that indicate the time in the fire when its contribution will cause the most serious consequences.
Thus, to be useful, the qualitative fire scenario has to be analysed so as to provide data which quantitatively relates the outcome of the incident to the behaviour of the product – as a source of ignition and/or in terms of its measurable fire properties as determined by available reaction-to-fire tests.
When preparing requirements and test specifications concerning fire hazard testing of products, it is suggested that the technical committees follow the procedures shown below.
- Read and follow the guidance contained in this document,
- Examine appropriate test procedures developed for the parameter(s) of concern and consider their possible applicability and limitations. Reference to the following IEC publications will be helpful. They provide a summary and relevance of commonly used fire tests:
- IEC 60695-1-21 (ignitability)
- IEC/TS 60695-5-2 (Corrosion damage effects of the fire effluents)
- IEC 60695-6-2 (Smoke obscuration)
- IEC 60695-7-2 (Toxicity of fire effluents)
- IEC 60695-8-2 (Heat release)
- IEC 60695-9-2 (Surface spread of flame)
- Compare the relevant fire characteristics identified in the scenario analysis to the relevant scope and significance of the existing test procedures,
- If an existing test procedures appears suitable, check that:
- The test conditions finally adopted bear as close a relationship as possible to the environment which is being modelled or simulated,
- The validity of the test data is related to the manner of use and installation of the product and its association with other product,
- The test procedure is acceptable as regards sensitivity, reproducibility and repeatability, and
- The test results are given in easily understood terms, parameters and units, giving a fully objective description. All indefinite, subjective and speculative phraseology should be avoided.
- If a new procedure is to be developed, quantify the essential features as listed above.
Further important features are the purpose of the test, the limitations of the test, the use of the information it provides and the ease of operation. In case where the fire tests are not yet specified and need to be developed or altered for the special purpose of an IEC technical committee, this should be done in close liaison with TC 89 as described in Clause 7 of Guide 104:2010. Than prepare the standard for the test method, including the relevant information on its field of application, its limitations and reservations, and on the use of the test results obtained. Make reference in the standard to recommended test procedures wherever possible.