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Each insulator is rated according to its ability to insulate. For example, if one insulator is good for x volts, then four insulators will be required for a line conductor operating at 4x volts with respect to earth (ground). However, additional insulators might also be inserted to compensate for local conditions -e.g. salt deposit (near the sea), industrial pollution (near factories), etc.

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Q: How do you choose no of insulator in High Voltage transmission Line?
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