Relay Maintenance

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Questions and Answers

What is the recommended action if high contact resistance is observed on any contact of a relay during routine inspection and maintenance?

  • Clean the relay
  • Ensure no loose connection
  • Check for rusting or sulphation
  • Use a spare contact or replace the relay (correct)

What should be ensured about the conditions inside the relay?

  • There are no foreign materials or water vapour (correct)
  • There is water vapour
  • There is dust
  • There is rusting or sulphation

What should be ensured about the relay's metal contacts?

  • They are not blackened due to arcing (correct)
  • They have pitting of carbon contacts
  • They are loose
  • They are blackened due to arcing

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