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

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

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

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

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