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CR1&C1 cable

Started by e.arp, January 02, 2017, 10:40:22 AM

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e.arp



What is best important issue or feature of consuraction or production for CR1&C1 cable?

Uta Shinichi YUTO

CR1  is  fire resistant  NF C 32070-2.3(CR1)
C1 is flame retardant  NF C 32070-2.2 (C1)

different test methods ,  you can not categorize both of them,  you can lookYou are not allowed to view links. Register or Login

Uta Shinichi YUTO

The NFC 323070  standard defines a test allowing the fire-resistance assessment of cables at rated voltage (500V). 1.5m of a cable is placed in a stainless-steel tube and placed in a tubular oven. This furnace heats the cable following the ISO834  time- temperature curve, and mechanical shocks are applied on the tube each 30 seconds. Under these conditions, the cable will maintain its electrical continuity for at least 65 min. Four to five tests will be satisfactory to attest cable conformity.

This performance was challenged by the French safety authorities, arguing that standard cables installed in 1 hour fire-resistant  protective systems were much reliable, robust and safe.

Indeed, protective systems using standard cables strongly compete in terms of safety with electrical installations based on fire-resistant cables  only. A test initiative was implemented via the Sycabel (French cable association) and technically led by Nexans Research Center-Lyon. The strategy was to quantify the fire-resistant potential of CR1 cables installed on a fire-resistant tray when tested in a large oven simulating a real fire. The objective was to determine whether the electrical integrity was ensured for at least 1 hour. This kind of mounting has the advantage of being less expensive,  less cumbersome, and easier to install in comparison with protective systems.

The final  results widely surpassed our  wishes,  as all  20  samples  fulfilled  the requirements (electrical integrity higher than 60 min) with a life-time average of 85 min. This conclusion was presented to the French authorities and validated as at least equivalent to standard cable installed in fire-resistant protective systems

source from nexans

e.arp