Cables used for underground services from 33 kV to 60 kV are

A. extra high-tension cables
B. high tension cables
C. super tension cables
D. extra super voltage cables

Answer: A. extra high-tension cables

Explanation:

Classification of underground cables on the basis of voltage level is given below

Type of Cable VS Voltage level (kV)

• Low tension (L.T.) Cable-----0 – 1 kV
• High tension (H.T.) Cable-----1 – 11 kV
• Super tension (S.T.) Cable-----11 – 33 kV
• Extra high-tension (E.H.T.) Cable----33 – 66 kV
• Extra super-tension(E.S.T.) Cable-----66 kV and above