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Electrical contractor 37 years. Electrical inspector 2 years
3,417 Posts
Why would you even ask such a question. If you are considering patching an high voltage transformer > 65K volts your crazy.

Just so we understand each other
  • High (HV), Extra- High (EHV) & Ultra-High Voltages (UHV) - 115,000 to 1,100,000 VAC.
  • Medium Voltage (MV) - 2,400 to 69,000 VAC.
  • Low Voltage (LV) - 240 to 600 VAC.
What many call high voltage is really low voltage. I try to go by context rather than terminology. I bet 90% of electricians call 480/277 high voltage. Being that the OP asked the question, I doubt he works with 5000 volts or above. I commend him for asking because I was in a situation 30 years ago where we needed one on a Saturday night. There was a damaged one on site but we opted to wait until we could get a new one. What is 12 volts considered?
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