Workscope: LVCB Inspection and Quote

• The circuit breaker will be inspected for worn, damaged and missing components
  

  -	Inspection includes, but is not limited to, broken secondary disconnects, bent or damaged interlock arms, rusting on the frame, bent primary disconnects, and missing hardware.
  -	Any items found will be recorded and a suitable replacement identified.

• Arc chutes will be removed, cleaned, and inspected for erosion and damage.
  

  -	Arc chutes will be inspected for chipped or broken components and for excessive pitting or burning in the arc path.
  -	Where available, arc chutes and other components containing asbestos should be replaced with the manufacturer's recommended non-asbestos parts. These asbestos replacement parts will be quoted at the customer’s request.
  -	Upon request, GE will properly dispose off the asbestos-containing materials.

• The circuit breaker will be functionally and operationally tested to determine any additional work required
  

  -	The breaker will be operated and inspected for binding of moving components.
  -	Individual electrical components will be tested as required.
  -	The circuit breaker will be inspected for applicable manufacturer updates.
  -	Any additional work required will be quoted separately.

• Contact assemblies will be inspected for proper wipe and signs of deterioration.
  

  -	Contact tips will be inspected for signs of excessive pitting and arcing.
  -	Contact structure will be inspected for dry lubrication and missing silver plating.
  -	The movable contacts will be inspected for proper alignment and spacing.

• The frame and mechanism will be inspected
  

  -	The frame and mechanism will be inspected for proper operation, trip shaft torque, dry lubrication, etc.

• Mechanical adjustments will be checked
  

  -	Contact wipe and gap measurements will be taken as required.
  -	Mechanism adjustments, such as trip latch wipe, will be completed according to manufacturer's specification.
  -	Quick close mechanism, if so equipped, will be checked.

• Interlocks, mechanical and electrical, will be checked
• Breaker electrical accessory devices will be tested for proper operation (if applicable)
  

  -	Under voltage device
  -	Adjustments will be made as necessary
  -	Shunt trip
  -	Open fuse lock out device
  -	Bell alarm (with or without lock out device)
  -	Auxiliary switch

• Final electrical tests will be performed, as applicable
• High current injection tests - each phase will be checked for over-current and fault protection as provided by the circuit breaker's trip device.
  

  -	Contact resistance tests - A digital low resistance ohmmeter will be used to record the contact resistance and compare it to the manufacturer's specifications. High resistance in the contact structure can cause excessive heat in the breaker and prematurely dry out the lubrication.
  -	Insulation resistance tests - A 500 to 1,000 volt megger will be used to determine the condition of the circuit breaker insulation to ground and across phases.
  -	Functional operational tests (electrical and manual) - The breaker will be electrically and manually operated.
  -	Contact overlap sequence tests (AKF field breakers only) - For generator field circuit breakers, the field contact overlap and sequence will be checked as per GE specifications.

• Test data will be included as part of the final customer report and quotation for repair
  

  -	All test data received will be included with the circuit breaker test report.
  -	A quotation of recommended repairs will be generated and sent to the customer.

For More Information

• Locate a service center

Related Information

• Low/med voltage circuit breakers
• High voltage circuit breakers
• Motor starters
• Substation maintenance
• Protective relays
• My Account
• Job Status