

  • Disconnect the overhead cable / bus from all bushings
  • Clean and dry porcelain
  • Insure test tap / voltage tap is clean and dry
  • Do not test bushing in a crate
  • Only open the tap cover for the bushing that is being tested
  • Ensure that the flange of the busing being tested is DIRECTLY grounded rather than through other device such as a jump switch.
  • Insure test setup is correct 
If testing H1, make sure all low side bushings are connected together & grounded. Insure all HV bushings including neutral are connected together. Contact PCORE for additional assistance with testing. 


  1. Where is PCORE Electric, Inc. located?
  2. How long has PCORE been manufacturing bushings?
  3. Is PCORE Electric an ISO Certified Company?
  4. What is PCORE’s product offering?
  5. What standards does PCORE manufacture it’s bushings to?
  6. What is a PCORE POC bushing?
  7. What is a PCORE PRC bushing?
  8. What is an Oil Free PRC bushing?
  9. What is a PCORE Quick Link bushing?
  10. What is a PCORE Test Terminal?
  11. What different designs of the test terminal are available?
  13. What elevation are PCORE bushings rated for?
  15. Are PCORE bushings seismically rated?
  17. What are benefits of PCORE’s bushing technologies?
  19. How often should PCORE bushings be tested?
  25. What are the recommended testing modes?
  27. What bushings are candidates for repair?
  29. How should a PRC bushing be stored?

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