Motor and generator components must be _______ from each other before testing with a megger.

Motor and generator components must be _______ from each other before testing with a megger.

• A. isolated
• B. connected
• C. grounded
• D. removed

Answer: (A)

Isolation is essential when using a megger. The test applies a high DC voltage to measure insulation resistance, so you want to remove any alternate current paths that could distort the reading. If motor and generator components are still connected, leakage can flow through the rest of the system, giving an inaccurate result or potentially damaging equipment. Keeping them isolated ensures you’re measuring only the insulation resistance of the component being tested, free from other circuits. It also reduces the risk of energizing other equipment or creating unsafe conditions during the test.

Isolation is essential when using a megger. The test applies a high DC voltage to measure insulation resistance, so you want to remove any alternate current paths that could distort the reading. If motor and generator components are still connected, leakage can flow through the rest of the system, giving an inaccurate result or potentially damaging equipment. Keeping them isolated ensures you’re measuring only the insulation resistance of the component being tested, free from other circuits. It also reduces the risk of energizing other equipment or creating unsafe conditions during the test.