3. Fire resistance of cables

Fire resistance of cables mainly consists in assessing the integrity of the circuit, i.e. the maintenance of electrical or optical power, control or command functions during a fire.

3.1 Old French system

Standard NF C32-070 lays down the principles for classifying conductors and cables in terms of fire behavior. The CR1 classification is awarded to cables capable of maintaining their functions for a certain period of time when exposed to fire. To obtain this classification, cables in the CR1-C1 category must demonstrate limited flame propagation, continue to operate under simulated fire conditions in a tube furnace, with temperatures following the standardized temperature-time curve, and undergo mechanical shocks while being maintained under electrical voltage...

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Fire resistance of cables

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Bibliography

(1) - NUREG/CR-6384 - Literature Review of Environmental Qualification of Safety-Related Electric Cables - (NUREG/CR-6384) https://www.nrc.gov/reading-rm/doc-collections/nuregs/contract/cr6384/index.html

Standards and norms

Insulated conductors and cables for installations – Tests to classify conductors and cables with regard to their fire behavior. - NF C32-070 - 2001
Tests on electric and optical fibre cables under fire conditions – Part 1-1: test for vertical flame propagation for a single insulated wire or cable – Apparatus. - IEC/EN 60332-1-1 - 2015
Tests on electric and optical fibre cables under fire conditions – Part...

Regulations

Order of July 21, 1994 modified, concerning classification and conformity attestation of the fire behavior of electrical conductors and cables, and approval of testing laboratories.

Order of October 15, 2014 amending the order of July 21, 1994 classifying and certifying the fire behavior of electrical conductors and cables, and approving testing laboratories, and setting the transitional terms for...