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
Smaller dielectric loss
Absence of harmonics
None of the listed here

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Electrical Cables
Solid type cables are considered unreliable beyond 66 kV because

Skin effect dominates on the conductor
Of corona loss between conductor and sheath material
There is a danger of breakdown of insulation due to the presence of voids
Insulation may melt due to higher temperature

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