Due to which of the following reasons the cables should not be operated too hot ?

A. Expansion of the oil may cause the sheath to burst

B. The oil may loose its viscosity and it may start drawing off from higher levels

C. The thermal instability may rise due to the rapid increase of dielectric losses with temperature

D. Unequal expansion may create voids in the insulation which will lead to ionization

E. All of the above
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