Exam Question
(a) What is the function of insulation in an electric conductor? (3)
(b) What are the various classes of insulation? (8)
(c) What are the desired properties of insulating material? (5)
Class 4 (4th Engineer)
MET
📅 Mar 2026
Reference Answer
### (a) Function of Insulation in an Electric Conductor
The primary function of insulation in an electrical conductor is to prevent the unintended flow of electric current. It serves several critical purposes:
1. **Confinement of Current:** Insulation provides a high-resistance barrier around the conductor, ensuring that current is confined to its intended path. This is essential for the efficient and correct operation of any electrical circuit.
2. **Prevention of Short Circuits:** It physically separates conductors from one another and from surrounding earthed structures. This prevents direct contact between points of different electrical potential, which would otherwise result in a short circuit, leading to excessive current flow, overheating, fire, and equipment damage.
The primary function of insulation in an electrical conductor is to prevent the unintended flow of electric current. It serves several critical purposes:
1. **Confinement of Current:** Insulation provides a high-resistance barrier around the conductor, ensuring that current is confined to its intended path. This is essential for the efficient and correct operation of any electrical circuit.
2. **Prevention of Short Circuits:** It physically separates conductors from one another and from surrounding earthed structures. This prevents direct contact between points of different electrical potential, which would otherwise result in a short circuit, leading to excessive current flow, overheating, fire, and equipment damage.
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