🔍 Key Concepts

• Insulated pedestal bearings are designed to prevent stray electrical currents from passing through the bearing surfaces • Stray current through bearings can cause pitting, overheating, and premature failure • Proper maintenance focuses on keeping the insulation effective, not defeating or masking it

💭 Think About

• Which option describes an action that would defeat or bypass the electrical insulation of the pedestal bearing rather than protect it? • Think about whether cleaning versus coating or contaminating an insulated surface is more likely to maintain its insulating properties. • Which practice could cause an unintended conductive path or hide damage in the insulated area over time?

✅ Before You Answer

• Identify which choice could reduce or short out insulation instead of preserving it. • Consider whether grease or paint on an insulated surface might change its electrical characteristics or hide defects. • Verify which practices are generally acceptable for checking insulation (such as megohmmeter use) when done under proper conditions.