Electrical Cables
The current carrying capacity of cables in D.C. is more than that in A.C. mainly due to

Nonexistence of any stability limit
Absence of harmonics
Smaller dielectric loss
None of the listed here

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Electrical Cables
Capacitance grading of cable implies

Capacitance required to be introduced at different lengths to counter the effect of inductance
Cables using single dielectric in different concentrations
Grading according to capacitance of cables per km length
Use of dielectrics of different permeabilities

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