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Undersized Conductor Simulation

Undersized Conductor: Effect of the Atlas Kablo experience


Insufficient copper in the conductor is the easiest method of reducing the cost of a cable but this significantly increase the risks of damage to equipment and even the fire safety in a building. Following on from the video that you have just seen, we will illustrate further what happens when a cable is installed which is undersized (either over resistance or the wrong conductor size)


Using the Thermal Imaging Camera, it can be demonstrated how hot the cables get during loading.  We have two 6mm² conductors and one 4mm² conductor set up in our rig which we will use to simulate an overload on the 4mm²


Each cable is loaded with the same current.


The thermal imaging camera shows clearly which cable gets hottest.  This example is illustrative of cable the Atlas Kablo imported into the country, which was marked one size, but which in fact was a full size smaller.


We can further demonstrate by calculation what happens to the conductor temperature when we apply the maximum rating of the 6mm²cable to a 4mm²


6491X (Installed in Conduit)

Size Standard Rating Max Temperature Increased Rating Temp
4mm2 28A 700C 36A 960C
6mm2 36A 700    

6491B/FP100 (Installed in Conduit)

Size Standard Rating Max Temperature Increased Rating Temp
4mm2 37A 900C 48A 1310C
6mm2 48A 900C    

If a cable is run in excess of its design load, it will get hot which will damage the cable and may also damage the connected equipment and accessories.  It will also prematurely age the insulation materials, which will lead to a reduction in the cable design life.  More importantly still, it will greatly increase the probability of a fire.  


Prysmian state a design life of 25 years for a cable that has been correctly sized, selected and installed.  For such an investment, we believe it would be prudent to install a product you can rely on that fully complies with the relevant British and International standards.


 

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