cable sizing app
<div class="btgrid"> <div class="row row-1"> <div class="col col-md-3"> <div class="content"> <p><img alt="" class="img img-responsive" src="/Portals/0/Images/Icons/cable_1.png" title="" /></p> </div> </div> <div class="col col-md-9"> <div class="content"> <p>Use the link on the left to access our cable sizing application. Manage and size all your cables, from low voltage to 33 kV.</p> </div> </div> </div> </div>
Elctrical Resistivities & Temperature Coefficients
The following table is taken from IEC 60287-1-1:2006 and other sources:
Dec 12, 2018 6:45 PM
Correct that resistivity in given table is the DC resistivity in
Should it be Ω/m as resistivity is proportional to length?
How to calculate α20 when temperature in cable is changing? Possible to assumed it's constant in temperature range og 20-90 degrees celcius?
Dec 12, 2018 7:35 PM
The values are the ones you should use for d.c. resistivity and the units are Ω.m.
For 20 to 90°C, normally people would assume α is constant. Using a more accurate value is probably not going to make much difference (unless you are doing laboratory type experiments).
If you are interested in how α varies with temperature, an Internet search will give more information.
Dec 12, 2018 7:52 PM
Great, thank you!