Tulekahju arenemise kiirus ja intensiivsus on seotud kõigi tulekahjul esinevate nähtuste muutumisega. Füüsikalised ja keemilised nähtused ei ole tulekahju ajal kogu aeg ühtlased. Nad võivad kiireneda, aeglustuda või olla stabiilsed. Tulekahju arenemise kiirus ja intensiivsus sõltuvad: põlevate ainete omadustest; põlevate ainete kompaktsusest ja asetusest; hapniku pealevoolust; põleva ruumi termdünaamilistest omadustest.
If the reference scenario (fire development in a room) selected as the basis for Table 1 of the Euroclasses decision is not considered to be appropriate for products in certain intended uses, then there may be a deficiency in the current classification system for these products.
However, as a rule, new reference scenarios should only be considered if the determining factors in relation to the development of fire are significantly different and the regulatory authorities in the Member States cannot satisfactorily adapt their regulations to the currently defined system.
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