Grounding, High Impedance [250.36, 2020 NEC]

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Did you know a high-impedance grounded ac system cannot serve line to neutral loads? In this video, Mike and the team as they  discuss NEC Section 250.36 and explain what a high-impedance grounded system is and how it differs from a conventional solidly grounded electrical system

  1. MikeHoltNEC
  2. Mike Holt Enterprises
  3. Electrician
  4. Bonding and Grounding
  5. Grounding and Bonding
  6. effective ground fault current path
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Комментарии
Автор

Yes, HRG’s have a huge advantage providing the system is operating correctly. Do you have a video that explains the cons of an HRG? Such as resistor failure, case grounds failure, monitoring system failures.

BOYSWILLBEBOYS
Автор

That is brilliant, I was never taught about this and wondered if it was possible to reduce the huge danger associated with phase to ground arc flash. Thank you. Im still not sure why you cant use line to neutral voltages with this system though?

KiwiMaker
Автор

I never understood why would you want to have a high impedance to ground. Common sense dictates you want a low resistance path to ground in case of ground fault, that way most current going to ground instead of someone touching equipment. So the high impedance grounding is just to limit the current going through the ground fault loop when a ground fault occurs? Is that correct?

thatelectrician
Автор

In this situation would we still follow table 250.102(C)(1) for sizing the EGC even though the fault current will be approximately 1 amp?

veeno