INDUSTRIAL WIRING PRACTICE - Practice Mode

1) Which rated voltage megger is used to measure the insulation resistance value of 3phase 415V induction motor?

250V 500V 1000V 2500V

Correct Answer: 1000V

2) Which instrument is used to measure the insulation resistance?

Shunt type ohmmeter Series type ohmmeter Megger Multimeter

Correct Answer: Megger

3) What is the main reason for leakage current flowing in wring installation?

Insulation failure Low earth resistance Incorrect size of earth wire High earth reactance

Correct Answer: Insulation failure

4) How many earth continuity conductors should be provided from the machine to panel board and to the main earth electrode?

4 3 2 1

Correct Answer: 2

5) Which size of GI conductor is used for earthing to the motor from the main electrode?

14 SWG 10 SWG 8 SWG 4 SWG

Correct Answer: 8 SWG

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