Derating factors for Cables Calculation

The cable's actual current rating will usually be lower than the standard (un-derated) value quoted by manufacturer’s brochures. How to find the Derating factors for depth of laying, grouping of cables, etc.

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Mohhamedibrahim

  • Dec 21st, 2016
 

Derating factors
1. Native soil of thermal resistivity
2. If Cable circuit to cable circuit crossing.
3. Wrong sheath bonding.

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kkpk

  • Feb 19th, 2018
 

There are seven factors for findout the derating factor value. they are temperature correction factor, ground temperature correction factor, cable distance correction factor, cable depth correction factor, cable grouping factor, soil resistance correction factor and thermal resistance factor. So by multiplying the said values based on Il, If rating and power we can find out the derating factor.
K = k1*k2*k3*k4*k5*k6*k7

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