What should be done when performing...

Question 1 / 270705eccefa4bacbc34ba4d4830d

Question 1 of 270705eccefa4bacbc34ba4d4830d

What should be done when performing maintenance of circuit breaker contacts?

Question 1 of 27070

What should be done when performing maintenance of circuit breaker contacts?

🔍 Key Concepts

• Purpose of circuit breaker contacts during opening/closing under load • Good vs. bad practices for cleaning electrical contacts • Effects of abrasives, oil, and filing on contact resistance and reliability

💭 Think About

• Think about which action helps you detect problems without changing the shape, material, or electrical characteristics of the contacts. • Which options might actually increase resistance, arcing, or overheating instead of improving operation? • Ask yourself: which step would a careful electrician use as a first step in maintenance, before deciding on any repair or replacement?

✅ Before You Answer

• Which choice involves only observation/assessment, not altering the contact surface? • Which options could leave residue or altered surfaces that interfere with good electrical contact? • Which actions might be specifically warned against in manufacturer electrical maintenance instructions?

Question 1 of 27070

What should be done when performing maintenance of circuit breaker contacts?

inspect for wear and misalignment of main contacts

apply a thin film of oil on contact surfaces

use a metallic oxide abrasive cloth to dress contacts

smooth roughened contact surfaces with a file

Question 1 / 270705eccefa4bacbc34ba4d4830d

Question 1 of 270705eccefa4bacbc34ba4d4830d

What should be done when performing maintenance of circuit breaker contacts?

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Question 1 of 27070

What should be done when performing maintenance of circuit breaker contacts?