Question 55Electricity & Electronics - QMED

The correct answer is C) painting or allowing grease build up on the insulated area. Insulated pedestal bearings are designed to isolate the bearing shell from the machine frame to prevent electrical current from passing through the bearings. Painting or allowing grease buildup on the insulated area can compromise this insulation, potentially leading to electrical leakage and damage to the bearing. The best practice is to keep the insulated area clean and free of any conductive materials that could short the insulation. The other options are incorrect because: A) Cleaning and removing grease from the insulated area is actually the recommended practice. B) Using a megohmmeter to check insulation values is a common maintenance procedure. D) Touching the bearing shell while the machine is running would be unsafe and could potentially damage the bearing.