2020 NEC Subsection 250.30(A)(1)(3)(c)

[xptpcrewx]

Subsection 250.30(A)(1)(3)(c) in the 2020 NEC pertains to Delta-Connected Systems, in particular 3-phase, 3-wire delta systems with a grounded conductor. Is this the same thing as a Corner Grounded system? Thanks in advance.

 

[tom baker]

I only had two 480V corner grounded deltas and the POCO wanted us to replace them, which we did. I belive a they are the same.
(Note correct terminology is section...most use article for a section citation, which is me is like saying 110 and 220 V. Its ok...kindof)

 

[don_resqcapt19]

Subsection 250.30(A)(1)(3)(c) in the 2020 NEC pertains to Delta-Connected Systems, in particular 3-phase, 3-wire delta systems with a grounded conductor. Is this the same thing as a Corner Grounded system? Thanks in advance.

Yes, that sub-section is talking about a 3 wire, corner grounded, delta system.

 

[xptpcrewx]

Thanks for clarifying. One other thing I'd like to clarify is proper terminology: Is 250.30(A)(1)(3)(c) considered a sub-section or section as tom baker is suggesting? I though 250 was the article 250.30 was the section and anything further designated with parenthesis under 250.30 was considered a subsection. Am I missing something?

 

[tom baker]

My use of section is from Mike Holts understanding the NEC and the dozen or so of his seminars I have attended, never heard him say subsection. There is an NFPA style manual if you want to track it down.

 

[don_resqcapt19]

Thanks for clarifying. One other thing I'd like to clarify is proper terminology: Is 250.30(A)(1)(3)(c) considered a sub-section or section as tom baker is suggesting? I though 250 was the article 250.30 was the section and anything further designated with parenthesis under 250.30 was considered a subsection. Am I missing something?

250 is an Article
250 Part I is a part (note that this can become important as parts can act as scopes for the material that follows...for example a part for over 1000 volts...that material in that part only applies to equipment operating over 1000 volts)
250.30 is a section
250.30(A) is a first level subdivision
250.30(A)(3) is a second level subdivision
250.30(A)(3)(c) is a third level subdivision

 

[xptpcrewx]

Thanks don-resqcapt19. This sums it up nicely!