Welcome

FP200 Gold and fire resistant cables from Prysmian Cables UK

Welcome

FP200 Gold and fire resistant cables from Prysmian Cables UK

Welcome

FP200 Gold and fire resistant cables from Prysmian Cables UK

 

Smoke Density Test

Smoke Test

Testing for low smoke status is important, as cables which fail to meet this crucial standard can produce toxic fumes which endanger the lives of those in the building during a fire.
These fumes can also obscure the visibility of escape routes and exits in a fire, and cause choking and coughing. It can be smoke, rather than fire itself, which is the most damaging to human life in the event of a fire.

Zero halogen


It is also important for cable to be zero halogen, as hydrogen chloride acid gas can damage eyes and deteriorate electronic systems (in buildings such as hospitals) and structures (for example, reinforced concrete), creating further hazards.
Prysmian would advise caution in acceptance of marketing terms such as LSF and LSOH, as these are company claims and not necessarily technically verified. What is important for cable is the standards they meet, not what they are called.
Ultimately, Prysmian recommends using cables which meet low smoke and zero halogen standards, detailed below, when working on public buildings.

Smoke and zero halogen standards


There are several standards for cables to meet with regard to smoke. Cables must meet BS EN 61034-2, which is a smoke cube test, measuring light transmission through a controlled combustion of bunched cables.
There are also smoke tests for CPR categorization of cables, to meet standard BS EN 50399.
Cables must also meet standard for zero halogen, which include BS EN 60754-1 and BS EN 60754-2. These standards measure the amount of halogen acid released during combustion, and the acidity of the gases when dissolved in water respectively. A cable with PVC coating will not satisfy these tests.


LSF or LSOH?


Those installing cable should also take care to familiarise themselves with the difference between LSF (Low Smoke and Fume) and LSOH (Low Smoke Zero Halogen) cables.
LSF may satisfy some smoke tests but will fail zero halogen tests. It is important to take care to make sure that the correct cable is bought and installed, in line with the expectations of the client.

Smoke Test
1. Standards
      a. Smoke

  • i. BS EN 61034-2 – smoke cube test, measure light transmission through a controlled combustion of bunched cables.
  • ii. <60% for PVC
  • iii. >80%  another
  • iv. <2% for ‘fire resistant cable’ sourced from the market
  • v. BS EN 50399 – smoke tests for CPR categorization of cables
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