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A guard ring is provided in a megger to ________

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A guard ring is provided in a megger to  ________

(a) protect the circuit

(b) eliminate error

(c) reduce current flow

(d) limit the temperature rise

The question was asked in homework.

This interesting question is from Megger in portion Measurement of Resistance of Electrical Measurements

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Correct option is (b) eliminate error

The explanation: Temperature rise can be prevented by reducing the flow of excessive current through the circuit. The role of a guard ring in a megger is to reduce the errors due to leakage current.

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