Question

the material commonly used for sheaths underground cables is
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Answer 1

copper

The conductor is enclosed by an insulating system (dielectric) whose main component is made of plastic, for example. An outer copperwire screen discharges fault currents and keeps the electric field in the cable. The outer cable sheath protects the cable against moisture.

Answer 2

Answer:

Lead is the material commonly used for sheath underground cables.

Step-by-step explanation:

Lead can be used as a chemical barrier in low, medium and instrumentation cables for all kinds of petrochemical projects.

Some advantages of lead sheath cables :

• Protection against entry of hydrocarbons.
• Protection against moisture ingress.

Hope u find it useful :-)