Dear Mr. Bahaa .,
Please check the revised sheet , and please not the following :
1- I have considered ground soil resistivity factor for 2.5 because in riyadh cable catalogue there is no usual value which is ( 2 )
2- in Riyadh cable catalogue, the Temp. and soil resistivity factors are combined, without give each factor separate ( check table below ).
My opinion :
- I think the problem in ground soil thermal resistivity because in Saudi cable when I calculate based on soil resistivity factor ( 2 ) , the cable will be sufficient to load , but when I consider it 2.5 “ the same of Riyadh cable” , I found the cable not sufficient to load .