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Latha saw an Electrical line man on the ...

Latha saw an Electrical line man on the electrical pole, he is rubbing electric wire with a sand paper.
She asked him ''why are you rubbing the wire, with sandpaper?'' What answer could be expected you from the line man?

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1) Something during rainy season the power supply to houses from the electric pole will be interrupted due to formation of the metallic oxide layer on the electric wire.
2) This metal oxide is an electric insulator.
3) On removing the metal oxide layer formed on the wire with a sandpaper.
4) Supply of electricity can be restored.
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