In conducting a megger test as shown in...

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Question 1 of 205eccefa4bacbc34ba4d483fa

In conducting a megger test as shown in figure "A" of the illustration, a ground is detected. For testing purposes, how can the motor itself be eliminated or confirmed as the source of the ground? See illustration EL-0027.

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🔍 Key Concepts

• Megger testing measures insulation resistance between conductors and ground • To locate a ground fault, you must isolate sections of the circuit (starter, feeder cable, motor) and test them separately • Compare figure A (entire circuit under test) with figure B (only one part of the circuit under test) to see what has changed

💭 Think About

• Look at what components are included in the test circuit in figure A. Which pieces of equipment are being measured together when the ground is first detected? • If you want to know whether the ground is in the motor windings or somewhere else, what must you disconnect so that you can test the motor separately from the feeder cable and starter? • Which answer choice best matches the test arrangement shown in figure B, and does that arrangement place the megger across just the motor, just the cable, or the whole system?

✅ Before You Answer

• Identify clearly where the megger leads are connected in figure A versus figure B • Make sure the method you choose will test only the motor (not the motor plus feeder plus starter) when checking whether the motor is grounded • Confirm that the option you select actually isolates the motor windings from the rest of the circuit before re‑testing

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