Extended field of application (EXAP) forreaction-to-fire Euro-classification of coppercommunication cables (CCC)

• The feasibility of an EXAP procedure for copper communication cables (CCC) has been investigated. The test set consisted of 47 different cables split into 9 families. An analysis method for quantifying the confidence of an EXAP procedure was defined.A similar EXAP procedure as for power cables was investigated, but where the safety margin sm was varied between 0% and 40% of the class limits for the corresponding Euroclasses. For power cables, and also for optical cables (OF) this safety margin was fixed to 10% of the class limits for the main classification (B2ca, Cca, and Dca) and 20% fire the smoke classes S1 and S2. For the analysed CCC it was found that the safety margin must be higher in order to obtain a confidence on the same level as for the OF EXAP already published in a Position Paper. The error rate for the OF EXAP was 2% for the main class. This error rate was obtained with a safety margin of 30% of the class limits for CCC. Even higher safety margins result in a lower error rate but a trade-off must be made between confidence in the EXAP and a reasonable, not too conservative, classification of CCC.Therefore a CCC EXAP is proposed with a safety margin sm = 30% of the class limits for the corresponding Euroclasses.Key words: EXAP, CPR, reaction to fire, copper communication cables, CCC

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