What different designs of the test terminal are available?

There are two designs of test terminals available. The traditional porcelain test terminal utilizes two castings (top and bottom) in which two porcelain insulators are cemented between the two castings. The side blades are then attached with stainless steel captive bolts. A porcelain test terminal is available in silver plated copper castings and side blades. A copper porcelain test terminal can also be tin plated vs. silver plated upon request. The cantilever strength of a copper porcelain test terminal is 575 ft-lbs. For permanent loading 50% of this rating should not be exceeded.

In 2012, PCORE launched a patented test terminal design called the SET Terminal or Seismically Enhanced Test terminal. A SET-Terminal utilizes a fiberglass rod that has a polymer sheath extruded over it as the center insulator. The top and bottom castings are then crimped onto the center insulator. The SET-Terminal is aluminum for current ratings up to 3000A. For 4000A and 5000A applications, the PCORE SET-Terminal is silver plated copper. A SET Terminal has a cantilever strength of 2500 ft-lbs. For permanent loading 50 % of this rating should not be exceeded.

For 345kV applications (1) corona ring is added to the top of the test terminal. For 500kV applications (2) corona rings are added to the test terminal.  


  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?
  12. What are the current limits for draw-lead connected bushings?
  13. What elevation are PCORE bushings rated for?
  14. Are PCORE bushings Transformer / Breaker Interchangeable (TBI)?
  15. Are PCORE bushings seismically rated?
  16. Does PCORE supply the gasket / o-ring for use between the bushing & equipment?
  17. What are benefits of PCORE’s bushing technologies?
  18. What tests does PCORE recommend be performed on a bushing in the field?
  19. How often should PCORE bushings be tested?
  20. What are the average power factor limits on PRC & POC bushings?
  21. Should power factor correction factors be used with PCORE bushings?
  22. When should you be concerned with power factor and capacitance test results of a PCORE bushing?
  23. What should the oil level be in the sight glass of a PCORE bushing?
  24. What can be done in the field to eliminate testing issues / abnormalities?
  25. What are the recommended testing modes?
  26. What information do I need to provide when replacing a bushing?
  27. What bushings are candidates for repair?
  28. What is the PCB level that is acceptable to ship a bushing to PCORE?
  29. How should a PRC bushing be stored?
  30. How should a low voltage (15kV – 69kV) POC bushings be stored?
  31. How should a high voltage (115kV-230kV) POC bushings be stored?
  32. How should an EHV (345kV -500KV) POC bushings be stored?

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