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

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

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

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

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